JPS59169165U

JPS59169165U - bias circuit

Info

Publication number: JPS59169165U
Application number: JP6229483U
Authority: JP
Inventors: 平川　和「あき」; 栗原　忠正
Original assignee: 日本電気株式会社
Priority date: 1983-04-26
Filing date: 1983-04-26
Publication date: 1984-11-12

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

[Brief explanation of drawings]

第１図は従来技術によるＡＢ級トランジスタ増幅器のバ
イアス回路、第２図は本考案の一実施例を示す図。図において、１・・・・・・高周波入力端子、２・・・
・・・高周波出力端子、３・・・・・・入力整合回路、
４・・・・・・出力整合回路、５・・・・・・トランジ
スタ、６・・・・・・バイアス電圧分圧抵抗、７・・・
・・・バイアス電圧安定化用ダイオード、８・・・・・
・サーミスタ感度調整用抵抗、９・・・・・・バイアス
電圧温度補償用サーミスタ、１０・・・・・・バイアス
電圧調整用可変抵抗、１１・・・・・・被変調波に対し
ショートインピーダンスにするコンデンサ、１２・・・
・・・ベース電圧供給用チョークコイル、１３・・・・
・・コレクタ電圧供給用チョークコイル、２０・・・・
・・バイアス電源供給端子、２１・・・・・・コレクタ
電源端子、３１・・・・・・第一の抵抗、３２・・・・
・・第二の抵抗、３３・・・・・・テレビジョン信号の
変調波周波数に対して充分インピーダンスを低（させる
コンデンサ。FIG. 1 shows a bias circuit for a class AB transistor amplifier according to the prior art, and FIG. 2 shows an embodiment of the present invention. In the figure, 1...high frequency input terminal, 2...
...High frequency output terminal, 3...Input matching circuit,
4... Output matching circuit, 5... Transistor, 6... Bias voltage dividing resistor, 7...
...Bias voltage stabilization diode, 8...
・Resistor for thermistor sensitivity adjustment, 9... Thermistor for bias voltage temperature compensation, 10... Variable resistor for bias voltage adjustment, 11... Short impedance for the modulated wave capacitor, 12...
...Base voltage supply choke coil, 13...
...Choke coil for collector voltage supply, 20...
...Bias power supply terminal, 21...Collector power supply terminal, 31...First resistor, 32...
...Second resistor, 33...A capacitor that makes the impedance sufficiently low for the modulation wave frequency of the television signal.

Claims

[Scope of utility model registration request]

A class AB transistor amplifier for power amplifying a television signal includes a choke coil having one end connected to the base of the transistor, a first resistor connected in series with the other end of the choke coil, and the first resistor. a second resistor connected in series with the choke coil and the second resistor, and a first capacitor that serves as a short impedance with respect to the modulated frequency and is disposed between the connection point of the choke coil and the second resistor and the ground;
4. A bias circuit comprising: a second capacitor disposed between the connection point of the first resistor and the second resistor and ground, the second capacitor having a sufficiently low impedance with respect to a modulation frequency.