Sample and hold circuit being arranged for easily changing phase

Details Sample and hold circuit being arranged for easily changing phase Sample and hold circuit being arranged for easily changing phase

1993-03-24

1994-11-29

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345100, G09G 336

Patent

active

053694171

ABSTRACT:
A sample and hold circuit is arranged to have a first shift register, a second shift register, a first group of sample and hold elements, a second group of sample and hold elements, and a phase switching circuit. The first shift register has a serial-in and parallel-out function and serves to shift an input sampling pulse in synchronization to the first shift clock. The second shift register has a serial-in and parallel-out function and serves to shift the input sampling pulse in a synchronous to a second shift clock being different from the first shift clock by a predetermined angle of phase. The first group of sample and hold elements serves to sample an analog signal in synchronization to an output from the first shift register. The second group of sample and hold elements serves to sample an analog signal in synchronization an output from the second shift register. The phase switching circuit serves to switch a phase relation between the first shift clock and the second shift clock in a manner so as to keep a predetermined phase angle between the first and the second shift clocks.

REFERENCES:
patent: 3768022 (1973-10-01), Lang
patent: 4213094 (1980-07-01), Wood
patent: 4499459 (1985-02-01), Sasaki
patent: 4758890 (1988-07-01), Boyce

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