Phase and frequency variable oscillator

Details Phase and frequency variable oscillator Phase and frequency variable oscillator

H - Electricity

03

C

331/39, 325/6, 3

H03C 3/40 (2006.01) H03B 21/00 (2006.01)

Patent

CA 1218427

ABSTRACT OF THE DISCLOSURE An improved oscillator which can independently adjust the phase and frequency of an output signal quickly, without time delay, is disclosed. The oscillator may be used, for instance, as a clock signal generator in a TDMA satellite communication system. This device comprises a fixed oscillator for providing a fixed frequency signal; a quadrature hybrid circuit for providing a pair of quadrature phased signals from the output of said fixed oscillator; a control signal generator for providing a pair of quadrature phased signals which satisfy b cos(2?.DELTA.fDt+.DELTA.0D) and b sin(2?.DELTA.fDt+.DELTA.0D), where b is a constant,.DELTA.fD is a desired frequency change, and .DELTA.0D is a desired phase change; a pair of mixers for providing the product of one output of said guadrature hybrid circuit with one output of said control signal generator and providing the product of the other output of said guadrature hybrid circuit with the other output of said control signal generator; and an in-phase power combiner for combining the outputs of said mixers to provide a controlled output signal which satisfies [2?(fO+.DELTA.fD)t +(0O+a0D)], where a, fO and 0O are constants.

447963

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