Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Identifying or correcting improper counter operation
Patent
1989-11-21
1992-01-28
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Identifying or correcting improper counter operation
377 48, 377 55, 377 56, H03K 2108, H03K 2140, H03K 2348
Patent
active
050849077
ABSTRACT:
A two-modulus variable frequency-divider circuit comprises a variable frequency-divider, a plurality of .div.2 frequency-dividers succeeding the variable frequency-divider, and a monitor. Outputs of one or more of the .div.2 frequency-dividers are coupled to the monitor which develops a monitor output determined by the states of the .div.2 frequency-divider outputs applied thereto. The monitor output is fed back to the variable frequency-divider as a frequency dividing factor setting signal. The two-modulus variable frequency-divider circuit is further provided with a signal converting circuit having a signal inverting function, which can selectively invert, in accordance with an externally applied control signal, the output of the two-modulus variable frequency-divider circuit or the output of the final one of those .div.2 frequency dividers which provide the outputs thereof to the monitor.
REFERENCES:
patent: 3560723 (1971-02-01), Kamachi
patent: 4090191 (1978-05-01), Kinbara
patent: 4394769 (1983-07-01), Lull
patent: 4611337 (1986-09-01), Evans
patent: 4658406 (1987-04-01), Pappas
patent: 4741006 (1988-04-01), Yamaguchi et al.
EDN Oct. 1, 1970, John Nichols & Charles Shinn "Pulse Swallowing", pp. 39-42.
IEDM, Dec. 1-4, 1985, Maemura et al., "Dual Modulus GaAs Precaler IC", pp. 94-96.
Heyman John S.
Mitsubishi Denki & Kabushiki Kaisha
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