JPS59166122U - Capacitance voltage conversion circuit - Google Patents

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

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の変換回路の一例を示す接続図、第２図は
本考案変換回路の一実施例を示す接続図、第３図は本考
案変換回路に用いるオートバイアス回路の他の例を示す
接続図である。Figure 1 is a connection diagram showing an example of a conventional conversion circuit, Figure 2 is a connection diagram showing an embodiment of the conversion circuit of the present invention, and Figure 3 is another example of an auto bias circuit used in the conversion circuit of the present invention. FIG.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 被測定量に応じて容量が変化する可変コンデンサと、容
量が一定な固定コンデンサと、前記可変コンデンサが反
転入力端子と出力端子間に接続された演算増幅器と、こ
の演算増幅器の反転入力端子に前記固定コンデンサを介
して接続される定振幅発振器と、前記演算増幅器の反転
入力端子と基準点間に接続される抵抗と、前記演算増幅
器の出力端子と非反転入力端子間に接続され、演算増幅
器の出力端子から直流バイアスをとり出して帰還するオ
ートバイアス回路と、前記演算増幅器の出力を整流して
直流の出力電圧を得る整流回路とを具えた容量電圧変換
回路。a variable capacitor whose capacitance changes depending on the quantity to be measured; a fixed capacitor whose capacitance is constant; an operational amplifier in which the variable capacitor is connected between an inverting input terminal and an output terminal; a constant amplitude oscillator connected via a fixed capacitor; a resistor connected between the inverting input terminal of the operational amplifier and a reference point; and a resistor connected between the output terminal and the non-inverting input terminal of the operational amplifier; A capacitive voltage conversion circuit comprising an auto-bias circuit that extracts and feeds back a DC bias from an output terminal, and a rectifier circuit that rectifies the output of the operational amplifier to obtain a DC output voltage.