High-frequency clock generator using lower frequency voltage con

Oscillators – Ring oscillators

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331 45, 331 60, 331177R, H03B 502, H03B 2700

Patent

active

055482511

ABSTRACT:
A low noise high-frequency clock generator using a low speed voltage controlled oscillator which includes 2m differential delay elements connected in series in an inverting configuration, where m is an integer greater than 0. The output of the 2mth delay element is coupled to the input of the first delay element in a non-inverting configuration. M 2-input exclusive NOR gates are provided wherein respective input pairs are taken from positive terminal inputs of adjacent delay elements. The clock generator also includes an m-input OR gate coupled to the m-outputs from the respective m exclusive NOR gates for generating the clock generator output signal. The delay elements have a variable delay associated therewith controlled by a control delay signal DCS. Changes in the delay associated with each delay element changes the frequency of the clock generator output signal wherein the output frequency is equal to 1/(2d), where d is the time delay associated with each delay element.

REFERENCES:
patent: 5180994 (1993-01-01), Martin et al.
patent: 5428318 (1995-06-01), Razavi
patent: 5436939 (1995-07-01), Co et al.

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