JPS58109321U - Preamplifier for television cameras - 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 drawings]

第１図は従来のパーシバル回路による雑音補償を行なっ
た前置増幅器の等価回路図、第２図は第１図に示す等価
回路の周波数特性性図、第３図はこの考案の実施例を示
す雑音補償を行なった前置　　゛−増幅器を含む光電変
換装置の回路図、第４図は第３図に示す光電変換装置の
等価回路図、第５図は第４図に示す等価回路の周波数特
性図、第６図は第３図に示す光電変換装置の実際の測定
結果を示す周波数特性図である。′□ なお、図中同一符号は同−又は相当部分を示す。 ２０・・・前置増幅器、２１・・・第１増岬回路、２２
・・・第２増幅器、２３・・・帰還回路、２４・・・負
！還回路、２５・・・第１入力端子、２６・・・第２出
力端子。Figure 1 is an equivalent circuit diagram of a preamplifier that performs noise compensation using a conventional percival circuit, Figure 2 is a frequency characteristic diagram of the equivalent circuit shown in Figure 1, and Figure 3 is an example of this invention. A circuit diagram of a photoelectric conversion device including a preamplifier with noise compensation, FIG. 4 is an equivalent circuit diagram of the photoelectric conversion device shown in FIG. 3, and FIG. 5 is a frequency characteristic of the equivalent circuit shown in FIG. 4. 6 are frequency characteristic diagrams showing actual measurement results of the photoelectric conversion device shown in FIG. 3. ′□ Note that the same reference numerals in the figures indicate the same or equivalent parts. 20... Preamplifier, 21... First augmentation circuit, 22
...Second amplifier, 23...Feedback circuit, 24...Negative! Return circuit, 25...first input terminal, 26...second output terminal.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 第１入力端子及び第１出力端子を有する第１増幅回路、
第２入力端子及び第２出力端子を有し、上記第２入力端
芋が上記第１出力端子に接続された第２増幅回路、上記
第１増幅回路の上記第１出力端子と上記第１入力端子と
の間番Ｊ続された周波数選択性帰還インピーダンそ、上
記第２増幅回路の上記第２出力端子と上記第１轡幅回路
の上記第１入力端子との間に接続された負帰還回路を備
え、信号に対する通過帯域特性を雑音に対する通過帯域
特性とが相互にほぼ独立にきめ得るようにしたことを特
徴とする前置増幅器。a first amplifier circuit having a first input terminal and a first output terminal;
a second amplifier circuit having a second input terminal and a second output terminal, the second input terminal being connected to the first output terminal; the first output terminal of the first amplifier circuit; and the first input terminal of the first amplifier circuit. a frequency selective feedback impedance connected to the terminal; and a negative feedback circuit connected between the second output terminal of the second amplifier circuit and the first input terminal of the first width circuit. 1. A preamplifier characterized in that the passband characteristics for signals and the passband characteristics for noise can be determined almost independently of each other.