Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Pulse multiplication or division
Patent
1989-05-22
1991-04-23
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Pulse multiplication or division
328 20, 307265, H03B 520, H03B 1900, H03K 406
Patent
active
050105612
ABSTRACT:
A frequency doubler operating where the predetermined duty cycle is essentially 50% in response to a series of input pulses with a given frequency and a duty cycle essentially of 50%. The circuit includes a means to generate a ramp signal which the ramp portion forms as a function of the repetition of the input pulses in response to the input pulses, an exclusive-OR logic to evaluate the exclusive-OR of the output from the ramp signal generating means and the input pulses in response to the output from the ramp signal generating means and said input pulses. A means, which is coupled to the ouptut of said exclusive-OR logic, integrates the output of the exclusive-OR logic, adds it to the ouptut from the ramp signal generating means, and feeds it back to the input of the exclusive-OR logic. A means, which is coupled to the integrating and feedback means, and causes the duty cycle of the output from the exclusive-OR logic to become essentially 50% by applying reference voltage.
REFERENCES:
patent: 4596954 (1986-06-01), Haque
Advanced Micro Devices , Inc.
Heyman John S.
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