JPH077326A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPH077326A
JPH077326A JP16872593A JP16872593A JPH077326A JP H077326 A JPH077326 A JP H077326A JP 16872593 A JP16872593 A JP 16872593A JP 16872593 A JP16872593 A JP 16872593A JP H077326 A JPH077326 A JP H077326A
Authority
JP
Japan
Prior art keywords
temperature
signal
voltage
digital
modulation signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16872593A
Other languages
Japanese (ja)
Inventor
Hideyuki Tanabe
英之 田辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP16872593A priority Critical patent/JPH077326A/en
Publication of JPH077326A publication Critical patent/JPH077326A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To provide the frequency modulation characteristic of frequency transition exactly corresponding to the voltage value of a modulated signal by exactly performing temperature compensation at the variable electrostatic capacity of a variable capacity element to a modulating signal to be inputted. CONSTITUTION:At a memory 14, the voltage of a digital modulating signal Sd is added/subtracted based on the temperature (C deg.) of a digital temperature signal Sa detecting the surrounding temperature and previously stored compensation data and the digital modulating signal Sd, to which temperature compensation is performed, is outputted. This digital modulating signal Sd is converted to an analog modulating signal Se by a D/A converter 15, and this analog modulating signal Se is inputted to a voltage controlled oscillator 16 as a signal equivalent with an input modulating signal Sb. At the voltage controlled oscillator 16, the analog modulating signal Se (voltage) is impressed to a variable capacity element 22, and a frequency modulated signal So is outputted.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、無線通信装置などに利
用し、入力される変調信号に温度補償を施して周波数変
調(FM)を行う周波数変調装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency modulator for use in a wireless communication device, etc., for performing frequency compensation (FM) by applying temperature compensation to an input modulated signal.

【0002】[0002]

【従来の技術】図4は従来の周波数変調装置の構成を示
すブロック図である。図4において、この周波数変調装
置は、電圧制御発振器を用いた例であり、インピーダン
ス整合などを行う抵抗器R1 を通じて、変調信号(電
圧)が可変容量素子2に印加される。この可変容量素子
2はカップリングコンデンサC1 を通じてコイルL及び
コンデンサC2 からなる共振回路に接続されており、こ
の共振回路の周波数で抵抗器R3 ,R2 のバイアス電圧
がベースに印加され、かつ、バイパス用及び帰還用のコ
ンデンサC3 ,C4 ,C5 が接続されたトランジスタQ
1 が発振する。この場合、変調信号(電圧)の変化に応
じて可変容量素子2の静電容量値(pF)が変化し、こ
の共振回路の周波数変化が、コンデンサC6 を通じて周
波数変調信号として出力される。
2. Description of the Related Art FIG. 4 is a block diagram showing the structure of a conventional frequency modulator. In FIG. 4, this frequency modulation device is an example using a voltage controlled oscillator, and a modulation signal (voltage) is applied to the variable capacitance element 2 through a resistor R1 that performs impedance matching or the like. This variable capacitance element 2 is connected to a resonance circuit composed of a coil L and a capacitor C2 via a coupling capacitor C1, bias voltages of resistors R3 and R2 are applied to the base at the frequency of this resonance circuit, and a bypass circuit is used. And a transistor Q to which feedback capacitors C3, C4 and C5 are connected
1 oscillates. In this case, the capacitance value (pF) of the variable capacitance element 2 changes according to the change of the modulation signal (voltage), and the frequency change of this resonance circuit is output as a frequency modulation signal through the capacitor C6.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上述し
た従来の周波数変調装置では、電波法に規定される周波
数偏移の上限が定められているように、入力される変調
信号(電圧)と周波数偏移の関係が周囲温度によって変
化しても、周波数偏移における上下限を越えないことが
要求される。図4に示した構成では、発振周波数を決定
する可変容量素子2が、図5に示すように印加電圧が一
定であっても、周囲温度変化(℃)で静電容量値(p
F)が増加するように変化してしまう。したがって、図
5及び図6に示すように、温度上昇で周波数偏移(KH
z) における低周波数が、所定値より低くなったり、温
度低下で周波数偏移における高周波数が、所定値より高
くなってしまう。すなわち、周波数偏移の上下限を越え
てしまったり変調信号電圧値に正確に対応した所定の周
波数変調特性(周波数偏移)が得られないという欠点を
有している。
However, in the above-mentioned conventional frequency modulator, the input modulation signal (voltage) and frequency deviation are set so that the upper limit of the frequency deviation specified by the Radio Law is set. It is required that the upper and lower limits of the frequency shift are not exceeded even if the relationship of the shift changes depending on the ambient temperature. In the configuration shown in FIG. 4, the variable capacitance element 2 that determines the oscillation frequency has a capacitance value (p) which varies with ambient temperature (° C.) even when the applied voltage is constant as shown in FIG.
F) changes so as to increase. Therefore, as shown in FIGS. 5 and 6, the frequency shift (KH
The low frequency in z) becomes lower than the predetermined value, or the high frequency in the frequency shift becomes higher than the predetermined value due to the temperature decrease. That is, there is a drawback that the upper and lower limits of the frequency deviation are exceeded, or a predetermined frequency modulation characteristic (frequency deviation) accurately corresponding to the modulation signal voltage value cannot be obtained.

【0004】この種の改善提案として、特開昭63ー2
45104号公報に開示された「FM変調回路」を挙げ
ることが出来る。この例は、変調信号入力端子と可変容
量ダイオードとの間にアクティブローパスフィルタを介
在して、能動素子のバイアス電圧供給回路に、温度補償
素子を結合することによって、発振周波数のずれを阻止
している。
As a proposal for improvement of this kind, JP-A-63-2
The "FM modulation circuit" disclosed in Japanese Patent No. 45104 can be mentioned. In this example, an active low-pass filter is interposed between the modulation signal input terminal and the variable capacitance diode, and a temperature compensation element is coupled to the bias voltage supply circuit of the active element to prevent the deviation of the oscillation frequency. There is.

【0005】この公報の例では、アクティブローパスフ
ィルタにオペアンプを用いているため、周囲の温度変化
によってオペアンプからの変調信号の値が変動し易く、
温度補償素子に対する正確な温度補償が困難であり、変
調信号の電圧値に正確に対応した所定の周波数変調特性
が得られ難いとい欠点がある。
In the example of this publication, since the operational amplifier is used for the active low-pass filter, the value of the modulation signal from the operational amplifier is likely to change due to the ambient temperature change.
It is difficult to accurately compensate the temperature of the temperature compensation element, and it is difficult to obtain a predetermined frequency modulation characteristic that accurately corresponds to the voltage value of the modulation signal.

【0006】本発明は、上述した事情にかんがみてなさ
れたものであり、入力される変調信号に、可変容量素子
の可変静電容量における温度補償を正確に施すことがで
き、周波数偏移が所定の上下限を越えることなく、変調
信号の電圧値に正確に対応した周波数編移の周波数変調
特性が得られる周波数変調装置の提供を目的とする。
The present invention has been made in view of the above-described circumstances, and the input modulation signal can be accurately temperature-compensated in the variable capacitance of the variable capacitance element, and the frequency deviation is predetermined. It is an object of the present invention to provide a frequency modulation device that can obtain frequency modulation characteristics of frequency transfer accurately corresponding to a voltage value of a modulation signal without exceeding the upper and lower limits.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するため
に、本発明の周波数変調装置は、変調信号電圧の変化に
対応した周波数変調信号を出力する電圧制御発振手段
と、周囲の温度を検出したデジタル温度信号を出力する
温度検出手段と、入力される変調信号を変換したデジタ
ル変調信号を出力するA/D変換手段と、温度変化によ
る電圧制御発振手段での周波数変動を補償するための温
度補償データを格納し、デジタル温度信号における温度
に対応してデジタル変調信号の電圧値を温度補償データ
に基づいて補正して出力する温度補償用データ格納手段
と、温度補償用データをアナログ信号に変換した変調信
号電圧を出力するD/A変換手段とを備える構成として
ある。
In order to achieve the above object, the frequency modulation device of the present invention detects the ambient temperature and a voltage control oscillation means for outputting a frequency modulation signal corresponding to a change in the modulation signal voltage. Temperature detecting means for outputting a digital temperature signal, an A / D converting means for outputting a digital modulation signal obtained by converting an input modulation signal, and a temperature for compensating a frequency fluctuation in the voltage controlled oscillation means due to a temperature change. Temperature compensation data storage means for storing compensation data and correcting and outputting the voltage value of the digital modulation signal based on the temperature compensation data according to the temperature in the digital temperature signal, and converting the temperature compensation data into an analog signal And a D / A conversion means for outputting the modulated signal voltage.

【0008】この構成にあって、温度検知手段を周囲の
温度を検知した温度信号を出力する温度センサと、この
温度センサから得られる温度信号をデジタル温度信号に
変換して出力するA/D変換手段とを備える構成として
ある。
In this structure, the temperature detecting means detects the ambient temperature and outputs a temperature signal, and the temperature signal obtained from this temperature sensor is converted into a digital temperature signal and output. And means.

【0009】また、電圧制御発振手段は、変調信号電圧
の変化に対応して静電容量値が変化して共振周波数を変
化させる可変容量素子を設ける構成としてある。
Further, the voltage controlled oscillating means is provided with a variable capacitance element which changes the electrostatic capacitance value corresponding to the change of the modulation signal voltage to change the resonance frequency.

【0010】さらに、温度補償用データ格納手段では、
デジタル温度信号の温度に基づいてデジタル変調信号の
電圧を加減算して温度補償を施したデジタル変調信号を
出力する構成としてある
Further, in the temperature compensation data storage means,
Based on the temperature of the digital temperature signal, the voltage of the digital modulation signal is added / subtracted to output the temperature-compensated digital modulation signal.

【0011】[0011]

【作用】上記構成からなる本発明の周波数変調装置は、
電圧制御発振手段における可変容量素子の温度変化によ
る周波数偏移を温度補償する温度補償データが予め格納
されており、検出したデジタル温度信号の温度と温度補
償データに基づいてデジタル変調信号の電圧を加減算
し、この温度補償を施したデジタル変調信号を電圧制御
発振手段における可変容量素子に印加し、この変調信号
電圧の変化に対応した周波数変調信号を得ている。した
がって、入力される変調信号に、可変容量素子の可変静
電容量における温度補償が正確に施され、周波数偏移が
所定の上下限を越えることなく、変調信号の電圧値に正
確に対応した周波数編移の周波数変調特性が得られる。
The frequency modulation device of the present invention having the above-mentioned structure is
The temperature compensation data for temperature compensating the frequency deviation due to the temperature change of the variable capacitance element in the voltage controlled oscillation means is stored in advance, and the voltage of the digital modulation signal is added or subtracted based on the temperature of the detected digital temperature signal and the temperature compensation data. Then, the temperature-compensated digital modulation signal is applied to the variable capacitance element in the voltage controlled oscillator to obtain the frequency modulation signal corresponding to the change of the modulation signal voltage. Therefore, the input modulation signal is accurately temperature-compensated in the variable capacitance of the variable capacitance element, and the frequency deviation does not exceed the predetermined upper and lower limits, and the frequency accurately corresponds to the voltage value of the modulation signal. The frequency modulation characteristic of transfer is obtained.

【0012】[0012]

【実施例】次に、本発明の周波数変調装置の実施例につ
いて図面を参照しながら説明する。図1は本発明の周波
数変調装置の実施例の構成を示すブロック図である。図
1において、周囲の温度を検出した温度信号を出力する
温度センサ11と、この温度センサ11からの温度信号
をデジタル温度信号Saに変換するA/D変換器12
と、入力変調信号Sbをデジタル入力変調信号Scに変
換するA/D変換器13とを有している。さらに、この
周波数変調装置は、デジタル温度信号Saに基づいてデ
ジタル入力変調信号Scに温度補償を施す温度補償用デ
ータを予め格納したメモリ14と、このメモリ14から
の温度補償を行ったデジタル変調信号Sdをアナログ変
調信号Seに変換するD/A変換器15と、D/A変換
器15からのアナログ変調信号Seの電圧値に対応して
周波数編移した周波数変調信号Soを出力する電圧制御
発振器16とを有している。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the frequency modulator of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the frequency modulator of the present invention. In FIG. 1, a temperature sensor 11 that outputs a temperature signal that detects an ambient temperature and an A / D converter 12 that converts the temperature signal from the temperature sensor 11 into a digital temperature signal Sa.
And an A / D converter 13 for converting the input modulation signal Sb into a digital input modulation signal Sc. Further, the frequency modulator includes a memory 14 in which temperature compensation data for performing temperature compensation on the digital input modulation signal Sc based on the digital temperature signal Sa is stored in advance, and the temperature-compensated digital modulation signal from the memory 14. A D / A converter 15 that converts Sd into an analog modulation signal Se, and a voltage controlled oscillator that outputs a frequency modulation signal So that is frequency-transferred corresponding to the voltage value of the analog modulation signal Se from the D / A converter 15. 16 and.

【0013】電圧制御発振器16は、インピーダンス整
合などを行う抵抗器R1 を通じてアナログ変調信号Se
が供給される可変容量素子22と、この可変容量素子2
2がカップリングコンデンサC1 を通じて接続され、共
振回路を構成するコイルL及びコンデンサC2 と、抵抗
器R3 ,R2 を通じてバイアス電圧がベースに印加さ
れ、かつ、バイパス用及び負帰還用のコンデンサC3 ,
C4 ,C5 並びに出力コンデンサC6 を通じて周波数変
調信号Soを出力するためのトランジスタQ1 とを有し
ている。
The voltage controlled oscillator 16 includes an analog modulation signal Se through a resistor R1 for impedance matching.
Of the variable capacitance element 22 and the variable capacitance element 2
2 is connected through a coupling capacitor C1, a coil L and a capacitor C2 that form a resonance circuit, a bias voltage is applied to the base through resistors R3 and R2, and capacitors C3 for bypass and negative feedback.
It has a transistor Q1 for outputting the frequency modulation signal So through C4, C5 and an output capacitor C6.

【0014】図2は予めメモリ14に格納される温度補
償用データを示す図である。図2において、デジタル入
力変調信号Scの電圧値Vin1 ,Vin2 ,Vin3 …Vin
n ごとに温度補償用データが格納されている。この温度
補償用データは、当該装置を使用する際の範囲の温度マ
イナス(−)10(℃),−9(℃),−8(℃),
…,43(℃),44(℃),45(℃)の変化に対応
して、デジタル入力変調信号Sc(入力変調信号Sb)
の電圧値Vinを加減算した「電圧値Vin−3.5」、
「電圧値Vin−3.4」、「電圧値Vin−3.2」、
…、「電圧値Vin+2.0」、「電圧値Vin+2.
1」、「電圧値Vin+2.3」の値のデジタル変調信号
Sdの補償データを得るものである。
FIG. 2 is a diagram showing temperature compensation data stored in the memory 14 in advance. In FIG. 2, voltage values Vin1, Vin2, Vin3 ... Vin of the digital input modulation signal Sc
Temperature compensation data is stored for each n. This temperature compensation data is the temperature of the range when using the device minus (-) 10 (° C), -9 (° C), -8 (° C),
..., 43 (° C.), 44 (° C.), 45 (° C.) corresponding to the change, digital input modulation signal Sc (input modulation signal Sb)
“Voltage value Vin−3.5” obtained by adding and subtracting the voltage value Vin of
"Voltage value Vin-3.4", "voltage value Vin-3.2",
..., "voltage value Vin + 2.0", "voltage value Vin + 2.
The compensation data of the digital modulation signal Sd having values of "1" and "voltage value Vin + 2.3" is obtained.

【0015】次に、この実施例の構成における動作につ
いて説明する。温度センサ11で、当該装置周辺の温度
が検知される。温度センサ11からは、周囲温度に対応
したアナログの温度信号が出力され、A/D変換器12
からデジタル温度信号Saが出力される。このデジタル
温度信号Saがメモリ14に入力される。また、入力変
調信号Sbは、A/D変換器13でデジタル入力変調信
号Scに変換されて、メモリ14に入力される。
Next, the operation of the configuration of this embodiment will be described. The temperature around the device is detected by the temperature sensor 11. An analog temperature signal corresponding to the ambient temperature is output from the temperature sensor 11, and the A / D converter 12
Outputs a digital temperature signal Sa. This digital temperature signal Sa is input to the memory 14. Further, the input modulation signal Sb is converted into a digital input modulation signal Sc by the A / D converter 13 and input to the memory 14.

【0016】メモリ14では、図2に示すように当該装
置周辺の温度を検知したデジタル温度信号Saの温度
(℃)に基づいてデジタル変調信号Sdの電圧を加減算
した「電圧値Vin−3.5」〜「電圧値Vin+2.3」
の値のデジタル変調信号Sdを出力する。すなわち、デ
ジタル温度信号Saにおける温度(℃)に基づいてデジ
タル変調信号Sdの電圧を加減算して、可変容量素子2
2の可変容量の温度変動に対する温度補償を施してい
る。この場合、周囲温度(℃)が低い場合は、デジタル
変調信号Sdに補償データを減算した低い電圧のデジタ
ル変調信号Sdを出力する。また、周囲温度(℃)が高
い場合は、デジタル変調信号Sdに補償データが加算さ
れた高い電圧のデジタル変調信号Sdを出力する。
In the memory 14, as shown in FIG. 2, "voltage value Vin-3.5" obtained by adding or subtracting the voltage of the digital modulation signal Sd based on the temperature (° C.) of the digital temperature signal Sa for detecting the temperature around the apparatus. "~" Voltage value Vin + 2.3 "
The digital modulation signal Sd having the value of is output. That is, the voltage of the digital modulation signal Sd is added / subtracted based on the temperature (° C.) in the digital temperature signal Sa to obtain the variable capacitance element 2
The temperature compensation for the temperature fluctuation of the variable capacitance 2 is performed. In this case, when the ambient temperature (° C.) is low, the digital modulation signal Sd having a low voltage obtained by subtracting the compensation data from the digital modulation signal Sd is output. Further, when the ambient temperature (° C.) is high, the digital modulation signal Sd having a high voltage in which the compensation data is added to the digital modulation signal Sd is output.

【0017】このデジタル変調信号Sdが、D/A変換
器15でアナログ変調信号Seに変換され、このアナロ
グ変調信号Seが入力変調信号Sbと温度補償を施した
等価な信号として電圧制御発振器16に入力される。電
圧制御発振器16では、インピーダンス整合などを行う
抵抗器R1 を通じて、アナログ変調信号Se(電圧)が
可変容量素子22に印加される。この可変容量素子22
はカップリングコンデンサC1 を通じてコイルL及びコ
ンデンサC2 からなる共振回路に接続されており、可変
容量素子22の静電容量値(pF)の変化で共振回路の
周波数も変化する。
This digital modulation signal Sd is converted into an analog modulation signal Se by the D / A converter 15, and this analog modulation signal Se is supplied to the voltage controlled oscillator 16 as an equivalent signal which is temperature-compensated with the input modulation signal Sb. Is entered. In the voltage controlled oscillator 16, the analog modulation signal Se (voltage) is applied to the variable capacitance element 22 through the resistor R1 which performs impedance matching or the like. This variable capacitance element 22
Is connected to a resonance circuit composed of a coil L and a capacitor C2 through a coupling capacitor C1, and the frequency of the resonance circuit also changes with a change in the capacitance value (pF) of the variable capacitance element 22.

【0018】この共振回路の周波数で、抵抗器R3 ,R
2 のバイアス電圧がベースに印加され、かつ、バイパス
用及び帰還用のコンデンサC3 ,C4 ,C5 が接続され
るトランジスタQ1 が発振する。この場合、可変容量素
子22の静電容量値(pF)の変化による共振回路の周
波数編移がコンデンサC6 を通じて周波数変調信号So
として出力される。
At the frequency of this resonant circuit, resistors R3, R
The bias voltage of 2 is applied to the base, and the transistor Q1 to which the bypass and feedback capacitors C3, C4 and C5 are connected oscillates. In this case, the frequency shift of the resonance circuit due to the change in the capacitance value (pF) of the variable capacitance element 22 is caused by the frequency modulation signal So through the capacitor C6.
Is output as.

【0019】このように検知温度のデジタル温度信号S
aの温度(℃)に基づいてデジタル変調信号Sdの電圧
を加減算して、可変容量素子22における可変容量の温
度変動に対する温度補償を施している。これによって、
アナログ変調信号Se(電圧)が一定の場合、図3に示
すように周囲温度(℃)の変化に対して電圧制御発振器
16から得られる周波数変調信号Soの周波数偏移が変
動せずに一定になる。すなわち、温度変化で周波数偏移
が、その上下限を越えたりせずに、変調信号電圧値に正
確に周波数編移が対応した周波数変調特性が得られる。
Thus, the digital temperature signal S of the detected temperature
The voltage of the digital modulation signal Sd is added or subtracted based on the temperature (° C.) of a to perform temperature compensation for the temperature variation of the variable capacitance in the variable capacitance element 22. by this,
When the analog modulation signal Se (voltage) is constant, as shown in FIG. 3, the frequency shift of the frequency modulation signal So obtained from the voltage controlled oscillator 16 does not change with respect to the change of the ambient temperature (° C.) and remains constant. Become. That is, the frequency shift characteristic does not exceed the upper and lower limits due to the temperature change, and the frequency modulation characteristic in which the frequency shift accurately corresponds to the modulation signal voltage value can be obtained.

【0020】[0020]

【発明の効果】以上説明したように、本発明の周波数変
調装置は、周囲の温度を検出したデジタル温度信号の温
度と温度補償データに基づいてデジタル変調信号の電圧
を加減算し、さらに温度補償を施したデジタル変調信号
を電圧制御発振手段における可変容量素子に印加し、こ
の変調信号電圧の変化に対応した周波数変調信号を得て
いるため、入力される変調信号に、可変容量素子の可変
静電容量における温度補償が正確に施され、周波数偏移
が所定の上下限を越えることなく、変調信号の電圧値に
正確に対応した所定の周波数変調特性が得られるという
効果を有する。
As described above, the frequency modulation device of the present invention adds or subtracts the voltage of the digital modulation signal based on the temperature and the temperature compensation data of the digital temperature signal which detects the ambient temperature, and further performs the temperature compensation. Since the applied digital modulation signal is applied to the variable capacitance element in the voltage controlled oscillation means to obtain the frequency modulation signal corresponding to the change of the modulation signal voltage, the input modulation signal has a variable electrostatic capacitance of the variable capacitance element. There is an effect that the temperature compensation in the capacitance is accurately performed, and the predetermined frequency modulation characteristic accurately corresponding to the voltage value of the modulation signal is obtained without the frequency deviation exceeding the predetermined upper and lower limits.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の周波数変調装置の実施例の構成を示す
ブロック図である。
FIG. 1 is a block diagram showing a configuration of an embodiment of a frequency modulation device of the present invention.

【図2】図1中のメモリに格納される温度補償用データ
を示す図である。
FIG. 2 is a diagram showing temperature compensation data stored in a memory shown in FIG.

【図3】実施例における周囲温度変化に対する電圧制御
発振器からの周波数偏移を示す図である。
FIG. 3 is a diagram showing a frequency deviation from a voltage controlled oscillator with respect to a change in ambient temperature in the example.

【図4】従来の周波数変調装置の構成を示すブロック図
である。
FIG. 4 is a block diagram showing a configuration of a conventional frequency modulator.

【図5】従来例における可変容量素子の温度変化対静電
容量変化を示す特性特性図である。
FIG. 5 is a characteristic characteristic diagram showing temperature change versus capacitance change of a variable capacitance element in a conventional example.

【図6】従来例における温度変化対電圧制御発振器にお
ける周波数偏移を示す図である。
FIG. 6 is a diagram showing a frequency shift in a voltage controlled oscillator versus temperature change in a conventional example.

【符号の説明】[Explanation of symbols]

11 温度センサ 12,13 A/D変換器 14 メモリ 15 D/A変換器 16 電圧制御発振器 22 可変容量素子 Sa デジタル温度信号 Sb 入力変調信号 Sc デジタル入力変調信号 Sd デジタル変調信号 Se アナログ変調信号 So 周波数変調信号 11 Temperature Sensor 12, 13 A / D Converter 14 Memory 15 D / A Converter 16 Voltage Controlled Oscillator 22 Variable Capacitance Element Sa Digital Temperature Signal Sb Input Modulation Signal Sc Digital Input Modulation Signal Sd Digital Modulation Signal Se Analog Modulation Signal So Frequency Modulation signal

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 変調信号電圧の変化に対応した周波数変
調信号を出力する電圧制御発振手段と、 周囲の温度を検出したデジタル温度信号を出力する温度
検出手段と、 入力される変調信号を変換したデジタル変調信号を出力
するA/D変換手段と、温度変化による上記電圧制御発
振手段での周波数変動を補償するための温度補償データ
を格納し、上記デジタル温度信号における温度に対応し
て上記デジタル変調信号の電圧値を上記温度補償データ
に基づいて補正して出力する温度補償用データ格納手段
と、 上記温度補償用データをアナログ信号に変換した上記変
調信号電圧を出力するD/A変換手段と、 を備える周波数変調装置。
1. A voltage-controlled oscillating means for outputting a frequency modulation signal corresponding to a change in a modulation signal voltage, a temperature detecting means for outputting a digital temperature signal detecting an ambient temperature, and an input modulation signal converted. A / D conversion means for outputting a digital modulation signal and temperature compensation data for compensating for frequency fluctuations in the voltage controlled oscillation means due to temperature changes are stored, and the digital modulation is performed corresponding to the temperature in the digital temperature signal. Temperature compensation data storage means for correcting and outputting the voltage value of the signal based on the temperature compensation data, and D / A conversion means for outputting the modulation signal voltage obtained by converting the temperature compensation data into an analog signal, And a frequency modulator.
【請求項2】 温度検知手段が周囲の温度を検知した温
度信号を出力する温度センサと、この温度センサから得
られる上記温度信号をデジタル温度信号に変換して出力
するA/D変換手段とを備えることを特徴とする請求項
1記載の周波数変調装置。
2. A temperature sensor that outputs a temperature signal obtained by detecting the ambient temperature by the temperature detection means, and an A / D conversion means that converts the temperature signal obtained from the temperature sensor into a digital temperature signal and outputs the digital temperature signal. The frequency modulation device according to claim 1, further comprising:
【請求項3】 電圧制御発振手段は、変調信号電圧の変
化に対応して静電容量値が変化し、共振周波数を変化さ
せる可変容量素子が設けられることを特徴とする請求項
1記載の周波数変調装置。
3. The frequency-controlled oscillator according to claim 1, wherein the voltage-controlled oscillating means is provided with a variable-capacitance element that changes a capacitance value in response to a change in the modulation signal voltage and changes a resonance frequency. Modulator.
【請求項4】 温度補償用データ格納手段では、デジタ
ル温度信号の温度に基づいてデジタル変調信号の電圧を
加減算して温度補償を施したデジタル変調信号を出力す
ることを特徴とする請求項1記載の周波数変調装置。
4. The temperature compensation data storage means outputs a temperature-compensated digital modulation signal by adding and subtracting the voltage of the digital modulation signal based on the temperature of the digital temperature signal. Frequency modulator.
JP16872593A 1993-06-15 1993-06-15 Frequency modulator Pending JPH077326A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16872593A JPH077326A (en) 1993-06-15 1993-06-15 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16872593A JPH077326A (en) 1993-06-15 1993-06-15 Frequency modulator

Publications (1)

Publication Number Publication Date
JPH077326A true JPH077326A (en) 1995-01-10

Family

ID=15873274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16872593A Pending JPH077326A (en) 1993-06-15 1993-06-15 Frequency modulator

Country Status (1)

Country Link
JP (1) JPH077326A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006295693A (en) * 2005-04-13 2006-10-26 Alps Electric Co Ltd Oscillation circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54111265A (en) * 1978-02-21 1979-08-31 Hitachi Denshi Ltd Phase modulator
JPS59202707A (en) * 1983-04-30 1984-11-16 Nec Corp Fm modulator
JPS62134933A (en) * 1985-12-09 1987-06-18 Mitsubishi Electric Corp Manufacture of x-ray exposing mask
JPH03201808A (en) * 1989-12-28 1991-09-03 Nippon Dempa Kogyo Co Ltd Temperature compensation oscillator
JPH03226103A (en) * 1990-01-31 1991-10-07 Nippon Dempa Kogyo Co Ltd Digital temperature compensated oscillator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54111265A (en) * 1978-02-21 1979-08-31 Hitachi Denshi Ltd Phase modulator
JPS59202707A (en) * 1983-04-30 1984-11-16 Nec Corp Fm modulator
JPS62134933A (en) * 1985-12-09 1987-06-18 Mitsubishi Electric Corp Manufacture of x-ray exposing mask
JPH03201808A (en) * 1989-12-28 1991-09-03 Nippon Dempa Kogyo Co Ltd Temperature compensation oscillator
JPH03226103A (en) * 1990-01-31 1991-10-07 Nippon Dempa Kogyo Co Ltd Digital temperature compensated oscillator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006295693A (en) * 2005-04-13 2006-10-26 Alps Electric Co Ltd Oscillation circuit

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