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

1983-07-28

1986-06-17

Shaw, Clifford C.

Communications: electrical

Audible indication

Percussion-type sound producer

334 11, H03K 1302

Patent

active

045959102

ABSTRACT:
A digital-to-analog converter suitable for use in a television tuning system for converting bits of a digital word to a corresponding tuning voltage includes a first digital-to-duty factor converter responsive to a group of the most significant bits of the digital word for generating a first incrementally variable duty factor pulse signal and a second digital-to-duty factor converter responsive to a group of the next most significant bits of the digital word for generating a second incrementally variable duty factor pulse signal. The amplitude of the first and second pulse signals are differentially weighted, e.g., by standard tolerance resistors (.+-.10%), such that the maximum average DC potential of the second signal is greater than a single increment of the average DC potential of the first signal. The weighted signals are combined and filtered by a lowpass filter which derives the tuning voltage. This deliberately results in non-monotonicity but without a significant reduction in resolution.

REFERENCES:
patent: 4016555 (1977-04-01), Tyrrel
patent: 4085372 (1978-04-01), Mogi et al.
patent: 4209775 (1980-06-01), Kawashima et al.
patent: 4258355 (1981-03-01), Edwards
patent: 4292625 (1981-09-01), Schoeff
patent: 4415882 (1983-11-01), Akazawa et al.
patent: 4450518 (1984-05-01), Klee
patent: 4484178 (1984-11-01), Lovgren et al.
"Digital Television Tuner Uses MOS LSI and Nonvolatile Memory" from Electronics, Apr. 1, 1976.
"An Electronic Tuning System for TV Receivers Utilizing a Non-Volatile NMOS Memory", 1976 IEEE International Solid-State Circuits Conference.

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