JPH0361727U

JPH0361727U -

Info

Publication number: JPH0361727U
Application number: JP12180589U
Authority: JP
Priority date: 1989-10-18
Filing date: 1989-10-18
Publication date: 1991-06-17

Description

[Brief explanation of drawings]

第１図は本考案の一実施例である位相比較器の
原理図、第２図は従来技術の位相比較器の入出力
信号の関係を示した図、第３図は位相比較器を用
いたＰＬＬのブロツク図、第４図は従来技術の問
題点を説明するための図、第５図は第１図のタイ
ミングチヤート、第６図は本考案の他の実施例の
ブロツク図である。１……位相比較器、５１……ステートバツフア
、５２……ＦＥＴ、５３……バイポーラトランジ
スタ、５４……アナログスイツチ、６１……マル
チバイブレータ。 Fig. 1 is a diagram showing the principle of a phase comparator that is an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between input and output signals of a phase comparator according to the prior art, and Fig. 3 is a diagram showing the relationship between input and output signals of a phase comparator according to the prior art. FIG. 4 is a diagram for explaining the problems of the prior art, FIG. 5 is a timing chart of FIG. 1, and FIG. 6 is a block diagram of another embodiment of the present invention. 1... Phase comparator, 51... State buffer, 52... FET, 53... Bipolar transistor, 54... Analog switch, 61... Multivibrator.

Claims

[Claims for Utility Model Registration] In a phase comparator that outputs a difference signal voltage according to the phase difference between first and second input pulse signals, the pulse of the first input pulse signal is detected and a single pulse is output. and a switch means for passing a second input pulse signal in accordance with the output of the single pulse and outputting it as a difference signal voltage, and the switch means is configured to pass a second input pulse signal according to the output of the single pulse, and output the second input pulse signal as a difference signal voltage. A phase comparator characterized in that its output is high impedance when not passing through the phase comparator.