Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Using shift register
Patent
1992-11-19
1994-06-21
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Using shift register
307265, 328 58, H03K 504
Patent
active
053234383
ABSTRACT:
A programmable pulse-width-modulation (PWM) signal generator for selectively generating several PWM signals each of which has a different pulse width. The programmable PWM signal generator, which may be adapted in a television system, includes a shift register for receiving data bits and a clock signal, a latch pulse generating circuit for counting the number of data bits received by the shift register and for generating an address latch pulse if the counted value reaches a predetermined value, an address decoder for generating an enable latch pulse corresponding to the address signal of the shift register in response to the address latch pulse, data latches for latching a value corresponding to the data signal output from the shift register in response to the enable latch pulse, and reloadable down-counters for counting from a value corresponding to the value latched by a respective one of the data latches to zero for producing PWM pulse signals of variable width.
REFERENCES:
patent: 4692859 (1987-09-01), Ott
patent: 4870665 (1989-09-01), Vaughn
patent: 4970418 (1990-11-01), Masterson
patent: 5130565 (1992-07-01), Girmay
patent: 5221906 (1993-06-01), Hayashi et al.
Heyman John S.
Samsung Electronics Co,. Ltd.
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