Digital-to-analog converter useful in a television receiver

Details Digital-to-analog converter useful in a television receiver Digital-to-analog converter useful in a television receiver

H - Electricity

03

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354/70

H03M 1/00 (2006.01) H03J 5/02 (2006.01)

Patent

CA 1164571

-19- RCA 72,373 Abstract of the Disclosure A digital-to-analog converter for use in a television tuning system to convert bits stored in a register to a corresponding tuning voltage includes a counter for generating binary pulse signals having pulses with durations proportional to powers of 2 and a plurality of selection gates for selecting ones of the binary pulse signals in accordance with the states of respective bits stored in the register to generate a plurality of output pulse signals each having G pulses with durations proportional to Image where n is the number of the respective bit. The output pulse signals are justified with respect to each other by position-determining gates and combined to form G clusters of contiguous but non-overlapping pulses. The resulting pulse signal is filtered by a low/pass filter to derive the tuning voltage. G is selected as a compromise value consistent with both reasonable temperature stability and a reasonably fast filter response.

365525

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