Phase and frequency variable oscillator

Details Phase and frequency variable oscillator Phase and frequency variable oscillator

1984-02-21

1985-11-19

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375119, 331 1A, H04B 702, H03L 700

Patent

active

045546720

ABSTRACT:
An improved oscillator which can adjust phase and frequency of the output signal independently from each other without time delay is disclosed. The oscillator is used for instance as a clock signal generator in a TDMA satellite communication system. The oscillator (FIG. 3) comprises a fixed oscillator (13) for providing a fixed frequency signal, a quadrature hybrid circuit (14) for providing a pair of quadrature phased signals from the output of said fixed oscillator (13), a control signal generator (17) for providing a pair of quadrature phased signals which satisfy b cos (2.pi..DELTA.f.sub.D t+.DELTA..phi..sub.D) and b sin (2.pi..DELTA.f.sub.D t+.DELTA..phi..sub.D), where b is a constant, .DELTA.f.sub.D is a desired frequency change, and .DELTA..phi..sub.D is a desired phase change, a pair of mixers (15,16) for providing products of each output of the quadrature hybrid circuit (14) and each output of the control signal generator (17), and an in-phase power combiner (20) for combining the outputs of the mixers (15,16 ) to provide a controlled output signal which satisfies ab sin [2.pi.(f.sub.O +.DELTA.f.sub.D)t+(.phi..sub.O +.DELTA..phi..sub.D)], where a, f.sub.O and .phi..sub.O are constants.

REFERENCES:
patent: 3633017 (1972-01-01), Crooke
patent: 3828138 (1974-08-01), Fletcher et al.
patent: 4099121 (1978-07-01), Fang
patent: 4159526 (1979-06-01), Mosley, Jr. et al.
patent: 4291269 (1981-09-01), Nossen
patent: 4338574 (1982-07-01), Fujita et al.
patent: 4464638 (1984-08-01), Crowley et al.
patent: 4485477 (1984-11-01), Nossen
patent: 4498059 (1985-02-01), Edwards et al.

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