Phase and frequency variable oscillator

专利名称：Phase and frequency variable oscillator发明人：Tatsuro Masamura,Masahiro

Morikura,Takayoshi Maki

申请号：US06/582215申请日：19840221公开号：US045672A公开日：19851119

摘要：An improved oscillator which can adjust phase and frequency of the outputsignal independently from each other without time delay is disclosed. The oscillator isused 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 frequencysignal, a quadrature hybrid circuit (14) for providing a pair of quadrature phased signalsfrom the output of said fixed oscillator (13), a control signal generator (17) for providinga pair of quadrature phased signals which satisfy b cos (2&pgr;&Dgr;f.sub.D

t+&Dgr;&phgr;.sub.D) and b sin (2&pgr;&Dgr;f.sub.D t+&Dgr;&phgr;.sub.D), where b is aconstant, &Dgr;f.sub.D is a desired frequency change, and &Dgr;&phgr;. sub.D is a desiredphase change, a pair of mixers (15,16) for providing products of each output of thequadrature hybrid circuit (14) and each output of the control signal generator (17), andan in-phase power combiner (20) for combining the outputs of the mixers (15,16 ) toprovide a controlled output signal which satisfies ab sin 2&pgr;(f.sub.O +&Dgr;f. sub.D)t+(&phgr;.sub.O +&Dgr;&phgr;.sub.D)!, where a, f.sub.O and &phgr;. sub.O are constants.

申请人：NIPPON TELEGRAPH & TELEPHONE PUBLIC CORP.

代理机构：Armstrong, Nikaido, Marmelstein & Kubovcik

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