Differential-logic ring oscillator with quadrature outputs

Details Differential-logic ring oscillator with quadrature outputs Differential-logic ring oscillator with quadrature outputs

1991-02-14

1993-01-19

Grimm, Siegfried H.

Oscillators

Beat frequency

Plural beating

331 45, 331 57, 331 60, 331DIG3, H03B 502, H03B 2700

Patent

active

051809940

ABSTRACT:
A topology for a high speed voltage controlled oscillator (VCO) with quadrature outputs is produced utilizing four inverting differential circuits. The fully differential four stage ring oscillator has outputs from alternate delay circuits combined in balanced exclusive OR gate frequency doublers to provide both in-phase and quadrature output signals at twice the ring oscillator frequency. The period of the quadrature delay signals is four gate delays and is easily realized in the Ghz frequency ranges. The in-phase and quadrature output signals are again combined in a balanced exclusive OR gate frequency doubler to obtain a final output frequency quadruple the ring oscillator frequency.

REFERENCES:
patent: 3235796 (1966-02-01), Tarczy-Hornoch
patent: 4833695 (1989-05-01), Greub
patent: 4884041 (1989-11-01), Walker

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