Counter for counting high frequency

Details Counter for counting high frequency Counter for counting high frequency

1998-02-26

1999-08-10

Wambach, Margaret R.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Pulse multiplication or division

377114, H03K 2100

Patent

active

059370246

ABSTRACT:
To implement a counter which can count clocks at high frequency exceeding the maximum operating frequency of the counter circuit, with a circuit with smaller circuit scale and lower power consumption, the present invention divides an externally set value HDB indicative of a count completion value into upper and lower bits, the upper bits being counted by using a counter circuit 12 with small circuit scale and power consumption, match being detected by a comparator 13. The clock signal is frequency divided to accommodate supply of high frequency clocks, and supplies it to the counter circuit 12. Then, the match detection signal of the upper bits is shifted in the number corresponding to the value of lower bits by a shift register 14 operating at a high frequency, and a count completion signal OUT is output.

REFERENCES:
patent: 4095093 (1978-06-01), Miles

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