JPS60103980U

JPS60103980U - phase modulation circuit

Info

Publication number: JPS60103980U
Application number: JP19579883U
Authority: JP
Inventors: 浦田　一夫; 沢田　繁; 直井　啓二
Original assignee: 日本ビクター株式会社
Priority date: 1983-12-20
Filing date: 1983-12-20
Publication date: 1985-07-16

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図は本考案を適用し得る光学的利得周波数特性測定
装置の一例の構成を示すブロック系統図、第２図は従来
の位相変調回路の一例の構成を示すブロック系統図、第
３図は上記第２図の各点の波形を示す波形図、第４図は
本考案になる位相変調回路の一実施例の構成を示すブロ
ック系統図、第５図は上記第４図の各点の波形を示す波
形図、第６図は、両極性パルス発生回路の具体的回路例
を示す回路部である。１０・・・鋸歯状波発生回路、１１・・・比較回路、１
２・・・単安定マルチバイブレータ、１３・・・両極性
パルス発生回路、１４・・・加算器、１５・・・パルス
発生部、１６・・・微分回路部、１７・・・両極性パル
ス発生部。FIG. 1 is a block diagram showing the configuration of an example of an optical gain frequency characteristic measuring device to which the present invention can be applied, FIG. 2 is a block diagram showing the configuration of an example of a conventional phase modulation circuit, and FIG. 3 is a block diagram showing the configuration of an example of a conventional phase modulation circuit. A waveform diagram showing the waveforms at each point in FIG. 2 above, FIG. 4 is a block system diagram showing the configuration of an embodiment of the phase modulation circuit according to the present invention, and FIG. 5 is a waveform diagram at each point in FIG. 4 above. The waveform diagram shown in FIG. 6 is a circuit section showing a specific circuit example of a bipolar pulse generation circuit. 10... Sawtooth wave generation circuit, 11... Comparison circuit, 1
2... Monostable multivibrator, 13... Bipolar pulse generation circuit, 14... Adder, 15... Pulse generation section, 16... Differentiation circuit section, 17... Bipolar pulse generation Department.

Claims

[Scope of utility model registration request]

(1) A sawtooth wave generation circuit that uses a horizontal frequency signal of a horizontal drive signal or horizontal synchronization signal as a trigger to generate a sawtooth wave synchronized with the horizontal frequency signal that monotonically changes from a constant potential, and triggers the horizontal frequency signal. a bipolar pulse generation circuit that generates a positive pulse having a sufficiently short time width with respect to the repetition period of the horizontal frequency signal, and then generates a negative pulse having approximately the same time width as the positive pulse; a composite sawtooth wave generation circuit that combines the outputs of the generation circuit and the bipolar pulse generation circuit to generate a composite sawtooth wave; and a comparison circuit that receives the output signal of the composite sawtooth wave generation circuit and the low frequency modulation signal as inputs. , a phase modulation circuit comprising a monostable multivibrator cascaded to the comparison circuit and generating a single pulse having substantially the same time width as the horizontal frequency signal.

(2) The bipolar pulse generation circuit includes a pulse generation section that generates a pulse with a sufficiently small time width using the horizontal frequency signal as a trigger, and a positive and negative (or negative) pulse that differentiates the pulse and has a sufficiently short time width. A utility model registration request consisting of a differentiating circuit section with a small time constant that generates time-shifted differential pulses (and positive) and a bipolar pulse generating section to which the output of the differentiating circuit section is applied as an input signal. The phase modulation circuit according to range 1.

(3) The bipolar pulse generation circuit differentiates the horizontal frequency signal and generates positive and negative (or negative and positive) time-shifted differential pulses having a time width of 70 minutes. The phase modulation circuit according to claim 1, which is constituted by a circuit section and a bipolar pulse generation section to which the output of the differentiating circuit section is applied as an input signal.