JPS59144934U

JPS59144934U - pulse frequency modulator

Info

Publication number: JPS59144934U
Application number: JP3774383U
Authority: JP
Inventors: 畠山　眞
Original assignee: 日本電気株式会社
Priority date: 1983-03-16
Filing date: 1983-03-16
Publication date: 1984-09-27

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、第２図は従来のＰＭＭ変調器のブロック図、第
３図は本考案の実施例を示すブロック図、第４図は来者
、案の実施例の具体的な回路図である。１・・・・・・定電流源、２・・・・・・比較器、３・
・・・・・単安定マルチバイブレータ、４・・間スイッ
チ回路、５・・・・・・定電流源、６・・・・・・検波
回路、７・・・・・・比較器、８・・・・・・パルス発
生回路、９・・・・・・遅延回路、７′・聞・比較器、
８′・・・・・・単安定マルチバイブレータ。Figures 1 and 2 are block diagrams of a conventional PMM modulator, Figure 3 is a block diagram showing an embodiment of the present invention, and Figure 4 is a specific circuit diagram of the proposed embodiment. . 1... Constant current source, 2... Comparator, 3.
... Monostable multivibrator, 4 ... switch circuit, 5 ... constant current source, 6 ... detection circuit, 7 ... comparator, 8 ... ...Pulse generation circuit, 9...Delay circuit, 7' listener comparator,
8'... Monostable multivibrator.

Claims

[Scope of utility model registration request]

A charging/discharging capacitor, a discharging constant current source coupled to the capacitor and flowing a constant current controlled by an input signal and determined by the input signal level, a comparator for comparing the potential of the capacitor with a reference potential, and a comparator for comparing the potential of the capacitor with a reference potential. A pulse frequency modulator using the charging and discharging of a capacitor, which has a monostable multivibrator that generates a pulse with a constant pulse width by its output, and a charging current source that is controlled by the output pulse of the monostable multivibrator and charges the capacitor. a detection circuit for monitoring the pulse output of the monostable multivibrator, a comparator for comparing the output of the detection circuit with a reference level, and a pulse for setting and resetting the monostable multivibrator using the output of the comparator. 1. A pulse frequency modulator, comprising a pulse generating circuit that generates pulses, and sets and resets the monostable multivibrator to start oscillation when pulse oscillation of the pulse modulator stops.