Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Patent
1988-03-25
1989-07-04
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
331 19, 331 25, H03L 720, H03L 722, H03L 718
Patent
active
048454435
ABSTRACT:
The described embodiment of the present invention provides a technique for minimizing unwanted components in the output of a frequency synthesizer. The output signal of the frequency synthesizer is tapped and mixed with a selective reference control signal. The reference control signal is selected by a control logic so that, when mixed with the output signal of the frequency synthesizer, a signal is derived of constant frequency no matter what frequency the frequency synthesizer is set to provide. This constant frequency signal is provided to a power divider. One output of the power divider is provided to a phase shifter which shifts the signal 180 degrees. The other output of the power divider is provided to a high quality band pass filter tuned to the constant frequency. The output of the phase shifter and the high quality band pass filter are recombined, thus cancelling the constant signal while leaving remnants of the undesired frequency drift. This signal is passed through a low pass filter and summed with the control voltage of the voltage controlled oscillator through a DC blocking capacitor. Because the undesired components are provided through the phase shifter, the undesired components degenerate when summed with the control voltage of the voltage controlled oscillator.
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Carroll Leo R.
General Dynamics Corporation, Pomona Div.
Grimm Siegfried H.
Martin Neil F.
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