JPS6059631U

JPS6059631U - Phase-lock droop circuit

Info

Publication number: JPS6059631U
Application number: JP14964583U
Authority: JP
Inventors: 俊彦大井
Original assignee: 株式会社東芝
Priority date: 1983-09-29
Filing date: 1983-09-29
Publication date: 1985-04-25

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 the drawing]

′　第１図は従来回路を説明する回路図、第２図はその
動作を説明するためのタイムチャート、第３図はこの考
案の一実施例を示す回路図、第４図は第３図に示した実
施例のレベル変換器の詳細を示す回路図、第５図は第３
図に示す実施例の動作を説明するためのタイムチャート
である。１・・・ディジタル位相比較器、２・・・低域フィルタ
、３・・・増幅器、４・・・電圧制御発振器、５・・・
分周器、６・・・レベル変換器。第１図第５図' Fig. 1 is a circuit diagram explaining the conventional circuit, Fig. 2 is a time chart to explain its operation, Fig. 3 is a circuit diagram showing an embodiment of this invention, and Fig. 4 is similar to Fig. 3. A circuit diagram showing details of the level converter of the embodiment shown, FIG.
3 is a time chart for explaining the operation of the embodiment shown in the figure. DESCRIPTION OF SYMBOLS 1...Digital phase comparator, 2...Low pass filter, 3...Amplifier, 4...Voltage controlled oscillator, 5...
Frequency divider, 6...level converter. Figure 1 Figure 5

Claims

[Scope of utility model registration request]

(1) A digital phase comparator that compares the phases of a clock signal of a predetermined frequency and a feedback signal, a level converter that converts the level of the output voltage of this digital phase comparator, and a high-frequency component of the output of this level conversion circuit that is cut off. a low-pass filter that amplifies the output of the low-pass filter;
It is equipped with a voltage controlled oscillator whose oscillation frequency is controlled by the output of this amplifier, and a frequency divider which divides the output of this voltage controlled oscillator and outputs the obtained frequency-divided signal to the digital phase comparator as a feedback signal. A phase-locked roof circuit characterized by:

(2) The level converter consists of a constant voltage element that receives the output of the digital phase comparator, a first resistor inserted between the input terminal of the constant voltage element and a reference potential point, and the constant voltage element. A variable resistor is inserted between the output terminal of the voltage element and a predetermined potential point, the base terminal is connected to the output terminal of the constant voltage element, the collector terminal is connected to the reference potential point, and the emitter terminal is connected to the level. A transistor used as the output terminal of the converter,
The phase-locked roof circuit according to claim 1, characterized in that the circuit comprises a second resistor inserted between the emitter terminal and the predetermined potential point.