JPH11298363A - Digital mobile radio equipment - Google Patents
Digital mobile radio equipmentInfo
- Publication number
- JPH11298363A JPH11298363A JP10114402A JP11440298A JPH11298363A JP H11298363 A JPH11298363 A JP H11298363A JP 10114402 A JP10114402 A JP 10114402A JP 11440298 A JP11440298 A JP 11440298A JP H11298363 A JPH11298363 A JP H11298363A
- Authority
- JP
- Japan
- Prior art keywords
- reception
- transmission
- capacitor
- band
- circuit
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000010355 oscillation Effects 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- Transceivers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はディジタル移動無線
機に関し、特に、バッテリセービングのため、そのシン
セサイザの送受信周波数帯域切替部の改良に関すもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile radio, and more particularly to an improvement of a transmission / reception frequency band switching unit of a synthesizer for battery saving.
【０００２】[0002]
【従来の技術】携帯電話等の移動体通信システムにおい
ては、ディジタル無線伝送技術，高能率音声符号化技術
等の急激な進歩によりＩＣ化が進み、小形化と周波数の
有効利用のためにディジタル変復調方式の移動無線機が
急速に実用化されてきた。2. Description of the Related Art In a mobile communication system such as a cellular phone, an IC has been developed due to a rapid progress in digital radio transmission technology, high-efficiency voice coding technology, and the like. Mobile radios have been rapidly commercialized.
【０００３】ＴＤＭＡ（時分割多元接続）は、例えば、
９００ＭＨｚ帯の移動無線機におけるディジタル方式の
代表的な回線制御のアクセス技術であり、１ＴＤＭＡフ
レームは複数のチャネル（スロット）で構成され、移動
機は自局に割当てられた送信スロットと受信スロットで
バースト的に送信後受信し、更に空時間があって、周囲
の基地局からの電波の強さをモニタすることができる。[0003] TDMA (Time Division Multiple Access) is, for example,
This is a typical digital channel control access technology in a 900 MHz band mobile radio, in which one TDMA frame is composed of a plurality of channels (slots), and a mobile station bursts in a transmission slot and a reception slot allocated to its own station. After receiving the signal, it receives the signal, and when there is still time, it is possible to monitor the intensity of the radio wave from the surrounding base station.
【０００４】公衆用，業務用など携帯無線の各運用シス
テムには基地送信周波数帯域と移動送信周波数帯域が割
り当てられている。図２は周波数帯域の割当例図であ
る。この例では、移動受信帯域（Ｒ）は移動送信帯域
（Ｔ）より低い周波数に割り当てられており、移動機の
送信スロットの周波数と受信スロットの周波数は、４５
ＭＨｚの間隔で運用される。[0004] A base transmission frequency band and a mobile transmission frequency band are allocated to each of the mobile radio operating systems such as public and business use. FIG. 2 is an example of frequency band allocation. In this example, the mobile reception band (R) is assigned to a lower frequency than the mobile transmission band (T), and the frequency of the transmission slot and the frequency of the reception slot of the mobile device are 45.
It is operated at intervals of MHz.
【０００５】このようなディジタル移動無線機に対して
は、フェージングに強く、占有帯域が狭く、干渉に強い
ことは勿論、小形化と電池持続時間をできるだけ長くす
るため、消費電力が少ないことが求められている。[0005] Such a digital mobile radio is required to have low power consumption in order to reduce the size and extend the battery life as much as possible, as well as being resistant to fading, narrow occupied band and interference. Have been.
【０００６】図３は本発明を適用しようとするディジタ
ル移動無線機のブロック図である。図において、１は送
受分波器、２は低雑音増幅器（ＬＮＡ）、３はバンドパ
スフィルタ（ＢＰＦ）、４はミキサ、５は復調器、６は
ＴＤＭＡ多重分離回路、７は音声コーデック、８は音声
回路、９は変調器、１０はミキサ、１１はＢＰＦ、１２
は電力増幅器（ＰＡ）、１３は周波数シンセサイザ、１
３−１は電圧制御発振器（ＶＣＯ）、１４は制御部、１
５は切替器である。FIG. 3 is a block diagram of a digital mobile radio to which the present invention is applied. In the figure, 1 is a transmission / reception splitter, 2 is a low noise amplifier (LNA), 3 is a band pass filter (BPF), 4 is a mixer, 5 is a demodulator, 6 is a TDMA demultiplexing circuit, 7 is a voice codec, 8 Is an audio circuit, 9 is a modulator, 10 is a mixer, 11 is a BPF, 12
Is a power amplifier (PA), 13 is a frequency synthesizer, 1
3-1 is a voltage controlled oscillator (VCO), 14 is a control unit, 1
5 is a switch.
【０００７】ＶＣＯ１３−１から出力される周波数シン
セサイザ１３の出力ｃは、切替器１５によって受信用ミ
キサ４と送信用ミキサ１０に切替え供給される。この場
合、ＶＣＯ１３−１は、制御部１４からの送受帯域切替
信号ｂによって、受信時は受信帯域Ｒの自局のチャネル
周波数信号ｃを出力して受信ミキサ４に供給し、送信時
は送信帯域Ｔの自局チャネル周波数信号ｃを出力して送
信ミキサ１０に供給するように構成されている。信号ａ
は自局のチャネル周波数に合わせるためのＶＣＯ１３−
１の制御電圧である。[0007] The output c of the frequency synthesizer 13 output from the VCO 13-1 is switched by the switch 15 to the reception mixer 4 and the transmission mixer 10, and is supplied. In this case, the VCO 13-1 outputs the channel frequency signal c of its own station in the reception band R at the time of reception and supplies it to the reception mixer 4 by the transmission / reception band switching signal b from the control unit 14, and the transmission band at the time of transmission. It is configured to output a local station channel frequency signal c of T and supply it to the transmission mixer 10. Signal a
Is a VCO 13- for tuning to the channel frequency of the own station.
1 control voltage.
【０００８】図４は従来のＶＣＯの詳細回路図である。
図において、２１は共振回路であり、誘電体共振器Ｚと
バラクタダイオード（可変容量ダイオード）ＣＲ0 が並
列接続され、制御電圧ａによって共振周波数を５．４Ｍ
Ｈｚ〜７．９±０．８ＭＨｚ／Ｖの範囲で変化させるこ
とができる。２２は発振回路であり、共振回路２１と接
続されて９００ＭＨｚ帯の発振信号をバッファ段を介し
て出力する。２４は周波数帯域切替部であり、共振回路
２１の誘電体共振器Ｚに並列に接続して発振周波数帯域
を変える（下げる）ための付加コンデンサＣ1 と、その
接地をオン／オフ（接／断）するスイッチ回路２３とか
らなり、制御部１４からの送受帯域切替信号ｂにより、
ピンダイオードＣＲ1 ，ＣＲ2 に与えるバイアス電流を
オン／オフしてコンデンサＣ1 をオン／オフする。FIG. 4 is a detailed circuit diagram of a conventional VCO.
In the figure, reference numeral 21 denotes a resonance circuit in which a dielectric resonator Z and a varactor diode (variable capacitance diode) CR 0 are connected in parallel, and the resonance frequency is set to 5.4 M by a control voltage a.
Hz to 7.9 ± 0.8 MHz / V. An oscillation circuit 22 is connected to the resonance circuit 21 and outputs an oscillation signal in the 900 MHz band via a buffer stage. 24 is a frequency band switching section, are connected in parallel to the dielectric resonator Z of the resonance circuit 21 changes the oscillation frequency band (lower) and additional capacitor C 1 for, the grounding ON / OFF (contact / cross ), And a transmission / reception band switching signal b from the control unit 14
The bias current applied to the pin diodes CR 1 and CR 2 is turned on / off to turn on / off the capacitor C 1 .
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、上記従
来の回路では、スイッチ回路２３をオンにしてコンデン
サＣ1 を接続したとき、ＶＣＯの出力は周波数の低い受
信帯域（Ｒ）となり、無線機の送信時間より長い受信待
ち受け時間に、スイッチ回路２３のピンダイオードＣＲ
2 ，ＣＲ3 に流れる電力が消費するという問題がある。
この場合、スイッチ回路２３がオンの状態で待ち受け時
間のとき、スイッチ回路２３に約５ｍＡの電流が流れ、
ＶＣＯ全体では１８ｍＡの電流が流れる。[SUMMARY OF THE INVENTION However, in the conventional circuit, when connected to capacitor C 1 turns on the switch circuit 23, the output of the VCO is lower frequency reception band (R), whereby the transmitter of the radio In the reception standby time longer than the time, the pin diode CR of the switch circuit 23 is
2 There is a problem that power flowing through CR 3 is consumed.
In this case, a current of about 5 mA flows through the switch circuit 23 during the standby time with the switch circuit 23 on,
A current of 18 mA flows in the entire VCO.
【００１０】本発明の目的は、上記待ち受け時に消費す
るスイッチ回路２３の電力を０にして、その分、無線機
の消費電力を低減するように構成した移動無線機を提供
することにある。An object of the present invention is to provide a mobile radio device configured to reduce the power consumption of the radio device to zero by setting the power of the switch circuit 23 consumed during the standby to zero.
【００１１】[0011]
【課題を解決するための手段】本発明の移動無線機は、
受信周波数帯域が送信周波数帯域より低く割当てられた
ＴＤＭＡ方式のディジタル移動無線システムの送受信機
であって、局部発振手段として設けられた電圧制御発振
器の共振回路に並列接続された付加リアクタンスを送受
帯域切替信号によりオン／オフすることによって送信ス
ロットと受信スロットの局発信号を送信側ミキサと受信
側ミキサに対して切替え出力する周波数シンセサイザが
備えられたディジタル移動無線機において、前記付加リ
アクタンスは、前記共振回路に並列接続された第１のコ
ンデンサとコイルとの直列回路と、該コイルと並列に設
けられ前記送受帯域切替信号によりオン／オフされる第
２のコンデンサとからなり、前記第１のコンデンサ，前
記コイル，前記第２のコンデンサの値は、該第２のコン
デンサがオフのときの前記付加リアクタンスのインピー
ダンスが、オンのときのインピーダンスより大きく、か
つ、オフの時とオンの時の前記電圧制御発振器の出力周
波数の差が所定の値になるように設定され、オフのとき
受信周波数帯域となるように構成したことを特徴とする
ものである。SUMMARY OF THE INVENTION A mobile radio according to the present invention comprises:
A transceiver for a TDMA digital mobile radio system in which a reception frequency band is assigned lower than a transmission frequency band, wherein additional reactance connected in parallel to a resonance circuit of a voltage controlled oscillator provided as a local oscillation means is switched between transmission and reception bands. In a digital mobile radio equipped with a frequency synthesizer for switching and outputting a local signal of a transmission slot and a reception slot to a transmission mixer and a reception mixer by turning on / off by a signal, the additional reactance is equal to the resonance. A series circuit of a first capacitor and a coil connected in parallel to a circuit; and a second capacitor provided in parallel with the coil and turned on / off by the transmission / reception band switching signal. The value of the coil and the value of the second capacitor are determined when the second capacitor is turned off. Is set so that the impedance of the additional reactance is larger than the impedance at the time of on, and the difference between the output frequency of the voltage controlled oscillator at the time of off and the output at the time of on is a predetermined value, and the reception is off at the time of off. It is characterized in that it is configured to be in a frequency band.
【００１２】[0012]
【発明の実施の形態】図１は本発明の要部をなすＶＣＯ
の詳細回路図である。図４の従来回路との違いは、周波
数帯域切替部２５の付加リアクタンスを、コンデンサＣ
2 とコイルＬ1 の直列回路と、コイルＬ1 と並列にコン
デンサＣ3 をスイッチ回路２３を介して設けたことにあ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a VCO which is an essential part of the present invention.
FIG. 4 is that the additional reactance of the frequency band switching unit 25 is
2 and a series circuit of coil L 1, is a capacitor C 3 in parallel to the coil L 1 that is provided through the switch circuit 23.
【００１３】このように周波数帯域切替部２５の回路を
構成し、送受帯域切替信号ｂの極性を逆にすると、スイ
ッチ回路２３をオンにしたときＶＣＯの発振周波数を周
波数の高い送信帯域にすることができる。そのために、
２つのコンデンサＣ2 ，Ｃ3とコイルＬ1 の値は、次の
ように設定する。When the circuit of the frequency band switching unit 25 is configured as described above and the polarity of the transmission / reception band switching signal b is reversed, the oscillation frequency of the VCO is set to a high frequency transmission band when the switch circuit 23 is turned on. Can be. for that reason,
The values of the two capacitors C 2 and C 3 and the coil L 1 are set as follows.
【００１４】スイッチ回路２３がオフのときのインピー
ダンス、すなわち、コンデンサＣ2とコイルＬ1 の直列
回路のインピーダンスをＸOFF とし、スイッチ回路２３
がオンのときのコイルＬ1 とコンデンサＣ3 の並列イン
ピーダンスとコンデンサＣ2とのインピーダンスをＸON
としたとき、ＸOFF ＞ＸONの関係で、かつ、送信／受信
周波数の差が所定の値、例えば４５ＭＨｚになるように
設定する。次の表１は具体例である。The impedance when the switch circuit 23 is off, that is, the impedance of the series circuit of the capacitor C 2 and the coil L 1 is set to X OFF , and the switch circuit 23 is turned off.
X ON but the impedances of the parallel impedance and a capacitor C 2 of the coil L 1 and the capacitor C 3 of the on
In this case, the relation X OFF > X ON and the difference between the transmission and reception frequencies is set to a predetermined value, for example, 45 MHz. Table 1 below is a specific example.
【００１５】[0015]
【表１】 [Table 1]
【００１６】図１の周波数帯域切替部２５のコンデンサ
Ｃ2 の値をできるだけ小さくすることにより、コイルＬ
1 による共振回路のＱの低下を最小限に抑えることがで
きる。これは、コイルＬ1 による損失を軽減する手段の
一つである。[0016] By minimizing the value of the capacitor C 2 of the frequency band switching section 25 of FIG. 1, the coil L
The reduction in Q of the resonance circuit due to 1 can be minimized. This is one means of reducing the losses due to the coil L 1.
【００１７】[0017]
【発明の効果】以上詳細に説明したように、本発明を実
施することにより、無線機の待ち受け時間には、スイッ
チ回路２３の電流が流れず、待ち受け時間におけるスイ
ッチ回路２３の電力消費を０にすることができる。As described above in detail, by implementing the present invention, the current of the switch circuit 23 does not flow during the standby time of the radio, and the power consumption of the switch circuit 23 during the standby time is reduced to zero. can do.
【図１】本発明の要部であるＶＣＯの実施例を示す回路
図である。FIG. 1 is a circuit diagram showing an embodiment of a VCO which is a main part of the present invention.
【図２】送受信周波数帯域の配列例を示す説明図であ
る。FIG. 2 is an explanatory diagram showing an example of arrangement of transmission and reception frequency bands.
【図３】本発明を適用する無線受信機のブロック図であ
る。FIG. 3 is a block diagram of a wireless receiver to which the present invention is applied.
【図４】従来のＶＣＯの回路例図である。FIG. 4 is a circuit example diagram of a conventional VCO.
１ 送受分波器 ２ ＬＮＡ ３，１１ ＢＰＦ ４，１０ ミキサ ５ 復調器 ６ ＴＤＭＡ多重分離回路 ７ 音声コーデック ８ 音声回路 ９ 変調器 １２ ＰＡ １３ 周波数シンセサイザ １３−１ ＶＣＯ １４ 制御部 １５ 切替器 ２１ 共振回路 ２２ 発振回路 ２３ スイッチ回路 ２４，２５ 周波数帯域切替部 DESCRIPTION OF SYMBOLS 1 Transmitting / receiving splitter 2 LNA 3,11 BPF 4,10 Mixer 5 Demodulator 6 TDMA demultiplexing circuit 7 Audio codec 8 Audio circuit 9 Modulator 12 PA 13 Frequency synthesizer 13-1 VCO 14 Control unit 15 Switching device 21 Resonance circuit 22 Oscillator circuit 23 Switch circuit 24, 25 Frequency band switching unit
Claims (1)
く割当てられたＴＤＭＡ方式のディジタル移動無線シス
テムの送受信機であって、 局部発振手段として設けられた電圧制御発振器の共振回
路に並列接続された付加リアクタンスを送受帯域切替信
号によりオン／オフすることによって送信スロットと受
信スロットの局発信号を送信側ミキサと受信側ミキサに
対して切替え出力する周波数シンセサイザが備えられた
ディジタル移動無線機において、 前記付加リアクタンスは、前記共振回路に並列接続され
た第１のコンデンサとコイルとの直列回路と、該コイル
と並列に設けられ前記送受帯域切替信号によりオン／オ
フされる第２のコンデンサとからなり、 前記第１のコンデンサ，前記コイル，前記第２のコンデ
ンサの値は、該第２のコンデンサがオフのときの前記付
加リアクタンスのインピーダンスが、オンのときのイン
ピーダンスより大きく、かつ、オフの時とオンの時の前
記電圧制御発振器の出力周波数の差が所定の値になるよ
うに設定され、オフのとき受信周波数帯域となるように
構成したことを特徴とするディジタル移動無線機。1. A transceiver for a digital mobile radio system of a TDMA system in which a reception frequency band is allocated lower than a transmission frequency band, wherein the additional device is connected in parallel to a resonance circuit of a voltage controlled oscillator provided as a local oscillation means. In the digital mobile radio device provided with a frequency synthesizer for switching and outputting a local signal of a transmission slot and a reception slot to a transmission mixer and a reception mixer by turning on / off a reactance by a transmission / reception band switching signal, The reactance includes a series circuit of a first capacitor and a coil connected in parallel to the resonance circuit, and a second capacitor provided in parallel with the coil and turned on / off by the transmission / reception band switching signal. The values of the first capacitor, the coil, and the second capacitor are different from those of the second capacitor. The impedance of the additional reactance when the sensor is off is larger than the impedance when on, and the difference between the output frequency of the voltage-controlled oscillator when off and on is set to a predetermined value. A digital mobile radio device configured to be in a reception frequency band when turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11440298A JP3961663B2 (en) | 1998-04-10 | 1998-04-10 | Digital mobile radio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11440298A JP3961663B2 (en) | 1998-04-10 | 1998-04-10 | Digital mobile radio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11298363A true JPH11298363A (en) | 1999-10-29 |
| JP3961663B2 JP3961663B2 (en) | 2007-08-22 |
Family
ID=14636794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11440298A Expired - Fee Related JP3961663B2 (en) | 1998-04-10 | 1998-04-10 | Digital mobile radio |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3961663B2 (en) |
-
1998
- 1998-04-10 JP JP11440298A patent/JP3961663B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3961663B2 (en) | 2007-08-22 |
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