Oscillators – Beat frequency – Plural beating
Patent
1992-03-16
1993-01-12
Grimm, Siegfried H.
Oscillators
Beat frequency
Plural beating
331 40, 331 42, 331 47, 331 48, H03B 2102
Patent
active
051793598
ABSTRACT:
A digitally controlled oscillator (100) having a first oscillator circuit (108) for providing an oscillator signal F.sub.o of a defined frequency and a digital divider (110) for dividing the oscillator signal F.sub.o by a selectable number controlled by a digital word for providing a clock signal F.sub.clk. A second oscillator circuit (104) receives the clock signal F.sub.clk and provides a low frequency signal F.sub.c. The second oscillator circuit includes a digitally controlled resonator element (112) for determining the frequency of the low frequency signal and has a center frequency dependent upon the clock signal. Circuitry (118, 120, 138) is included for providing first and second pairs of quadrature phase shifted signals derived from the clock signal F.sub.clk and the low frequency signal F.sub.c and from the oscillator signal F.sub.o, respectively. Finally, a mixer (136) is provided for mixing the first and second pairs of quadrature phase shifted signals for providing a single high frequency output signal F.sub.out which varies in accordance with the digital word.
REFERENCES:
patent: 4344046 (1982-08-01), Zumsteg
patent: 4831339 (1989-05-01), Nemeth
Brown C. D.
Denson-Low W. K.
Grimm Siegfried H.
Heald R. M.
Hughes Aircraft Company
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