Digital voltage controlled oscillator

Details Digital voltage controlled oscillator Digital voltage controlled oscillator

1993-03-26

1994-09-13

Nelli, Raymond A.

Oscillators

Ring oscillators

331 34, 331 17, 331 1A, H03B 2700

Patent

active

053472349

ABSTRACT:
A digital phase lock loop is provided, comprising a digital voltage controlled oscillator, a phase detector, and an up/down counter. The digital voltage controlled oscillator is responsive to a first set of control signals received from the up/down counter to provide an output signal. The phase detector receives and compares the frequency of the output signal with the frequency of a reference signal and, based on the comparison, outputs to the up/down counter a second control signal which determines the status of the first set of control signals. The digital voltage controlled oscillator comprises (i) an array of delay elements and (ii) a decoder for receiving the first set of the control signals from the up/down counter and for selectively activating one or more of the delay elements in response thereto. The decoder provides a separate output line for each of the delay elements which is to be selectively activated. The logic required to implement the decoder requires only a single AND gate and a single OR gate for each of the delay elements in the array.

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"Wide-Range, Variable-Frequency Oscillator Circuit", IBM Technical Disclosure Bulletin, vol. 30, No. 3, Aug. 1987, p. 1181.

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