JPS5885816U

JPS5885816U - filter device

Info

Publication number: JPS5885816U
Application number: JP18275981U
Authority: JP
Inventors: 尾崎　博行
Original assignee: 松下電器産業株式会社
Priority date: 1981-12-07
Filing date: 1981-12-07
Publication date: 1983-06-10

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図は従来例におけるフィルタ装置の回路図、第２図
、第３図は第１図の動作説明のための入出力波形図１、
第４図は本考案の一実施例におけるフィルタ装置の回路
図、第５図、第６図は第３図の動作説明のための入出力
波形図である。１５・・・・・・レベル変換用トランジスタ、７・・・
・・・エミッタフォロア１ランジスタ、３，４・・・・
・・平滑回路を構成する抵抗、５，６・・・・・・平滑
回路を構成するコンデンサ、１６．１７・・・・・・ベ
ースバイアス抵抗、１８・・・・・・コレクタ負荷抵抗
。Fig. 1 is a circuit diagram of a conventional filter device, Figs. 2 and 3 are input/output waveform diagrams 1 for explaining the operation of Fig. 1,
FIG. 4 is a circuit diagram of a filter device according to an embodiment of the present invention, and FIGS. 5 and 6 are input/output waveform diagrams for explaining the operation of FIG. 3. 15...Level conversion transistor, 7...
...Emitter follower 1 transistor, 3, 4...
...Resistor forming the smoothing circuit, 5,6... Capacitor forming the smoothing circuit, 16.17... Base bias resistance, 18... Collector load resistance.

Claims

[Scope of utility model registration request]

A transistor with a bias resistor connected to the base is provided, and an input pulse whose duty cycle changes at a constant cycle is applied to the emitter of the transistor, level converted, and taken out from the collector, and the collector output is passed through a smoothing circuit. A filter device that smooths the output from the emitter of an emitter follower transistor.