Digital programmable frequency generator

Details Digital programmable frequency generator Digital programmable frequency generator

1992-12-08

1995-05-16

Pascal, Robert J.

Oscillators

Ring oscillators

331 1A, 331 25, 331 34, 327114, H03B 524

Patent

active

054164460

ABSTRACT:
Frequency generators that may be programmed are utilized in a wide variety of applications. Typical applications include radio and television receivers and transmitters, and computer devices that must operate at different clock rates, or be compatible with systems that operate at different clock rates. The present technique provides for programmably generating a frequency. A ring oscillator receives at least one operating voltage through a programmable array of field effect transistors. Digitally selecting a given set of the transistors provides a given operating current for the ring, which establishes the frequency of operation. In one embodiment, the technique is implemented in a CMOS integrated circuit. This technique provides for more rapid frequency changes in a low-power circuit than can be obtained with typical prior-art techniques (e.g., a phase-locked loop).

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patent: 5233316 (1993-08-01), Yamada et al.
European Search Report dated Dec. 2, 1994.

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