Digital frequency multiplier

Details Digital frequency multiplier Digital frequency multiplier

1999-01-04

2000-06-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

327116, 327119, 331 27, 331 34, 331 57, H03L 7099

Patent

active

06075415&

ABSTRACT:
A digital frequency multiplier is provided that continues to adjust its multiplied frequency after the desired multiplied frequency is reached, that can be tested during operation and that is easily scalable. The digital frequency multiplier comprises a frequency detector, a frequency adjuster and a ring oscillator (RO). The frequency detector is configured for receiving a reference frequency and an RO output frequency, and for continuously monitoring a difference between the reference frequency and the RO output frequency. Based on the continuously monitored difference, the frequency detector continuously outputs an adjusting signal to the frequency adjuster. In response thereto, the frequency adjuster outputs selection data to the RO that adjusts the oscillation frequency of the RO, and thus the multiplied frequency of the digital frequency multiplier. Testable and growable logic circuitry are provided within the RO that allow the digital frequency multiplier to be tested during operation and easily scaled.

REFERENCES:
patent: 3970954 (1976-07-01), Even
patent: 5146121 (1992-09-01), Searles et al.
patent: 5245231 (1993-09-01), Kocis et al.
patent: 5438300 (1995-08-01), Saban et al.
patent: 5592515 (1997-01-01), Saban et al.
patent: 5764111 (1998-06-01), Bushman
patent: 5786715 (1998-07-01), Halepete

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