Oscillators – Beat frequency – Plural beating
Patent
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
Buchwald Aaron W.
Martin Kenneth W.
Dawes Daniel L.
Grimm Siegfried H.
The Regents of the University of California
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