JPH0398531U

JPH0398531U -

Info

Publication number: JPH0398531U
Application number: JP640290U
Authority: JP
Priority date: 1990-01-26
Filing date: 1990-01-26
Publication date: 1991-10-14

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例によるデイジタル
コンパレータ回路を示す回路図、第２図は第１図
の回路各部の信号を示すタイミングチヤート図、
第３図は従来のデイジタルコンパレータ回路を示
す回路図である。３……カウンタ、４……デイジタルコンパレー
タ、６……出力回路（Ｄフリツプフロツプ）、９
……１／ｎ分周器（1/2分周期）、１１……クロ
ツク選択回路（ＲＳフリツプフロツプ）。なお、
図中、同一符号は同一、または相当部分を示す。 FIG. 1 is a circuit diagram showing a digital comparator circuit according to an embodiment of the invention, FIG. 2 is a timing chart showing signals of various parts of the circuit in FIG. 1,
FIG. 3 is a circuit diagram showing a conventional digital comparator circuit. 3...Counter, 4...Digital comparator, 6...Output circuit (D flip-flop), 9
...1/n frequency divider (1/2 period), 11...clock selection circuit (RS flip-flop). In addition,
In the figures, the same reference numerals indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

A counter that counts the period of the input pulse using a reference clock, a digital comparator that compares the count value of this counter with a set value, and an output circuit that outputs the output of this digital comparator at the timing of the input pulse. In the digital comparator circuit equipped with a 1/n frequency divider that generates a clock whose frequency is divided by 1/n from the reference clock, and when the count value of the counter does not exceed the set value,
/n divided clock is selected and counted by the above counter, and on the other hand, if the above set value is exceeded,
A digital comparator circuit comprising: a clock selection circuit that causes the counter to count the reference clock, and restarts counting of the 1/n divided clock at the timing when the counter reaches a set count value. .