Digital control circuit for tuning systems with a pulse density

Details Digital control circuit for tuning systems with a pulse density Digital control circuit for tuning systems with a pulse density

1990-06-15

1991-10-22

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, 455182, 455186, 3581951, 331 17, H03M 186

Patent

active

050599798

ABSTRACT:
A digital control circuit with a device for generating a high-resolution tuning voltage is suitable for use in receivers for RF signals, particularly in consumer equipment. The tuning voltage can be electronically switched from one value to another at a high speed. The transient time required with conventional control loops is nearly eliminated since the low-pass filter or the digital integrator is preset to its steady-state integration value. To generate the tuning voltage, dynamic digital-to-analog convertors are provided which, despite their high resolution, require only a smoothing filter with a short response time and a short time constant.

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patent: 4817195 (1989-03-01), Kubo et al.
ITT Semiconductors, "SAA 1290, Remote-Control and Tuning IC for TV Receivers", Jul. 1986, Order No. 6251-222-5E.

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