Read only memory control circuit for use in a phase lock loop

Details Read only memory control circuit for use in a phase lock loop Read only memory control circuit for use in a phase lock loop

1985-12-11

1987-09-08

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

328 27, 331 17, 331 25, 340347DA, 365189, 365230, H03L 708, H03M 170

Patent

active

046927131

ABSTRACT:
A control circuit comprising a read-only memory has its storage area divided into two areas each containing the same number of addressasble words. By arranging that input of a single address signal causes a change from addressing a particular wood in one area to addressing a corresponding word in the other area, and by programming a fixed difference in value between corresponding words in the two areas causes a step function in the output. Using a digital to analogue converter on the output of the circuit permits a step change in a voltage output to be provided to (e.g.) a voltage controlled oscillator. A control circuit using a read-only memory as a voltage comparator is also disclosed.

REFERENCES:
patent: 3772681 (1973-11-01), Skingle
patent: 4318188 (1982-03-01), Hoffmann
patent: 4443767 (1984-04-01), Reichert et al.
patent: 4450538 (1984-05-01), Shirasaka
patent: 4533879 (1985-08-01), Sauer et al.

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