JPH02165708A - Detection circuit - Google Patents
Detection circuitInfo
- Publication number
- JPH02165708A JPH02165708A JP32111288A JP32111288A JPH02165708A JP H02165708 A JPH02165708 A JP H02165708A JP 32111288 A JP32111288 A JP 32111288A JP 32111288 A JP32111288 A JP 32111288A JP H02165708 A JPH02165708 A JP H02165708A
- Authority
- JP
- Japan
- Prior art keywords
- diode
- detection circuit
- resistor
- detection
- reference voltage
- 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
Links
Landscapes
- Manipulation Of Pulses (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
・〔産業上の利用分野〕
本発明は、検波出力を較正する際の温度による影響を排
除した検波回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a detection circuit that eliminates the influence of temperature when calibrating a detection output.
従来、オーディオ信号やビデオ信号等の入力信号を検波
する場合には、第２図に示すように、入力端子ｌにその
入力信号を印加してダイオードＤＩで整流検波し、コン
デンサＣＩで平滑すると共に抵抗Ｒ１で電流／電圧変換
してから、比較器２の一方の入力端子２１に印加させ、
他方の端子２２に印加する基準電圧Ｖｒと比較して、そ
の差分を出力端子２３に出力することにより、較正され
た検波信号を得ていた。Conventionally, when detecting an input signal such as an audio signal or a video signal, as shown in Figure 2, the input signal is applied to the input terminal l, rectified and detected by the diode DI, smoothed by the capacitor CI, and After converting the current to voltage with the resistor R1, apply it to one input terminal 21 of the comparator 2,
A calibrated detection signal was obtained by comparing the reference voltage Vr applied to the other terminal 22 and outputting the difference to the output terminal 23.
ところが、検波用ダイオードＤ１は温度特性を有し、温
度によりその順方向電圧が変化する。このため、温度に
よって比較器２の入力端子２１に印加する検波信号のレ
ベルが変化し、出力端子２３に現れる検波信号が温度特
性を持つことになり、後段の回路でその検波信号を使用
する際に種々不都合を生じる。However, the detection diode D1 has temperature characteristics, and its forward voltage changes depending on the temperature. Therefore, the level of the detection signal applied to the input terminal 21 of the comparator 2 changes depending on the temperature, and the detection signal appearing at the output terminal 23 has temperature characteristics. This causes various inconveniences.
本発明はこのような点に鑑みたもので、その目的は、温
度の影響を完全に排除した検波回路を提供することであ
る。The present invention has been made in view of these points, and its purpose is to provide a detection circuit that completely eliminates the influence of temperature.
このために本発明は、検波用ダイオードと、該ダイオー
ドのカソード側と接地間に接続された電流／電圧変換用
の第１の抵抗と、上記ダイオードのカソード側と接地間
に接続された平滑用のコンデンサと、上記第１の抵抗で
変換された電圧信号を基準電圧と比較する比較器とから
なる検波回路において、
上記比較器の上記基準電圧印加側の入力端子に上記検波
用ダイオードと同一規格の温度補償用ダイオードのカソ
ードを接続すると共に、上記入力端子と接地間に電流／
電圧変換用の第２の抵抗を接続し、上記温度補償用ダイ
オードのアノード側に上記基準電圧を印加させるように
した。For this purpose, the present invention includes a detection diode, a first resistor for current/voltage conversion connected between the cathode side of the diode and ground, and a smoothing resistor connected between the cathode side of the diode and ground. In a detection circuit consisting of a capacitor of Connect the cathode of the temperature compensation diode and connect the current/current between the above input terminal and ground.
A second resistor for voltage conversion was connected to apply the reference voltage to the anode side of the temperature compensation diode.
〔実施例〕
以下、本発明の実施例について説明する。第１図はその
一実施例の検波回路を示す図である。第２図に示したも
のと同一のものには同一の符号を付した。[Examples] Examples of the present invention will be described below. FIG. 1 is a diagram showing a detection circuit of one embodiment. Components that are the same as those shown in FIG. 2 are given the same reference numerals.
本実施例では、比較器２の一方の入力端子２２に、上記
したダイオードＤ１と同一規格の温度補償用ダイオード
Ｄ２を順方向接続する共に、そのカソード側を電流／電
圧変換用の抵抗Ｒ２を介して接地した。そして、基準電
圧Ｖｒは、ダイオードＤ２のアノード側に印加させるよ
うにした。In this embodiment, a temperature compensation diode D2 of the same standard as the diode D1 described above is connected in the forward direction to one input terminal 22 of the comparator 2, and its cathode side is connected via a current/voltage conversion resistor R2. and grounded. The reference voltage Vr was applied to the anode side of the diode D2.
従って、このダイオードＤ２はダイオードＤＩと同等の
温度特性を持つことになるので、ダイオードＤＩのカソ
ード側に現れる検波電圧の温度特性と、ダイオードＤ２
のカソード側に現れる基準電圧Ｖｒの温度特性とは同じ
となり、両者を比較する比較器２で比較されて出力端子
２３に現れる検波信号は、温度特性を持たない信号、つ
まり温度補償された信号となる。Therefore, this diode D2 has the same temperature characteristics as the diode DI, so the temperature characteristics of the detected voltage appearing on the cathode side of the diode DI and the temperature characteristics of the diode D2
The temperature characteristics of the reference voltage Vr appearing on the cathode side of Become.
以上のように本発明によれば、温度の影響を受けない検
波信号を、極めて簡単な回路構成により得ることができ
る。As described above, according to the present invention, a detected signal that is not affected by temperature can be obtained with an extremely simple circuit configuration.
第１図は本発明の一実施例の検波回路の回路図、第２図
は従来の同回路図である。
代理人 弁理士 長 尾 常 明FIG. 1 is a circuit diagram of a detection circuit according to an embodiment of the present invention, and FIG. 2 is a conventional circuit diagram. Agent Patent Attorney Tsuneaki Nagao
Claims (1)
側と接地間に接続された電流／電圧変換用の第１の抵抗
と、上記ダイオードのカソード側と接地間に接続された
平滑用のコンデンサと、上記第１の抵抗で変換された電
圧信号を基準電圧と比較する比較器とからなる検波回路
において、 上記比較器の上記基準電圧印加側の入力端子に上記検波
用ダイオードと同一規格の温度補償用ダイオードのカソ
ードを接続すると共に、上記入力端子と接地間に電流／
電圧変換用の第２の抵抗を接続し、上記温度補償用ダイ
オードのアノード側に上記基準電圧を印加させるように
したことを特徴とする検波回路。(1) a detection diode, a first resistor for current/voltage conversion connected between the cathode side of the diode and ground, and a smoothing capacitor connected between the cathode side of the diode and ground; , a detection circuit comprising a comparator that compares the voltage signal converted by the first resistor with a reference voltage, and a temperature compensation having the same standard as the detection diode is connected to the input terminal of the comparator on the reference voltage application side. In addition to connecting the cathode of the diode for the
A detection circuit characterized in that a second resistor for voltage conversion is connected to apply the reference voltage to the anode side of the temperature compensation diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32111288A JPH02165708A (en) | 1988-12-20 | 1988-12-20 | Detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32111288A JPH02165708A (en) | 1988-12-20 | 1988-12-20 | Detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02165708A true JPH02165708A (en) | 1990-06-26 |
Family
ID=18128956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32111288A Pending JPH02165708A (en) | 1988-12-20 | 1988-12-20 | Detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02165708A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009105726A (en) * | 2007-10-24 | 2009-05-14 | Panasonic Corp | High frequency power detection circuit and wireless communication device |
-
1988
- 1988-12-20 JP JP32111288A patent/JPH02165708A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009105726A (en) * | 2007-10-24 | 2009-05-14 | Panasonic Corp | High frequency power detection circuit and wireless communication device |
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