Digital synthesizer controlled microwave frequency signal source

Details Digital synthesizer controlled microwave frequency signal source Digital synthesizer controlled microwave frequency signal source

1994-10-06

1996-05-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

327100, 327107, 327119, 331 4, 331178, H03L 712, H03L 720

Patent

active

055215327

ABSTRACT:
A signal source provides an output signal which can sweep over a broad frequency range in a well-controlled manner. The signal source includes a voltage controlled oscillator (VCO) producing the output signal and a waveform synthesizer producing a reference signal. The VCO output signal is phase locked to the reference signal. To make the VCO signal continuously sweep over a broad frequency range, the reference signal sweeps repeatedly over a narrow frequency range. During each sweep of the reference signal, the VCO frequency tracks an integer harmonic of the reference signal frequency. The frequency and phase of the reference signal for each successive sweep are abruptly reset at the beginning of each sweep selected such that the VCO signal frequency locks to another integer harmonic of the reference signal frequency and does not change. Thus the VCO signal frequency sweeps continuously throughout the successive sweeps of the reference signal frequency but is unaffected by abrupt changes in reference signal frequency between successive reference signal frequency sweeps.

REFERENCES:
patent: 4144579 (1979-03-01), Nossen et al.
patent: 4160958 (1979-07-01), Mims et al.
patent: 5015971 (1991-05-01), Taylor et al.

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