| 摘要 |
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 fDt+ DELTA phi D) and b sin (2 pi DELTA fDt+ DELTA phi D), where b is a constant, DELTA fD is a desired frequency change, and DELTA phi 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 (fO+ DELTA fD)t+( phi O+ DELTA phi D)], where a, fO and phi O are constants.
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