Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Patent
1984-11-28
1986-04-22
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
331 19, 331 25, 331 30, 331116R, H03L 720
Patent
active
045845395
ABSTRACT:
A multi-channel frequency synthesizer, including a crystal oscillator circuit that may be selectively operated to provide a reference signal at a selected reference frequency that is one of a given plural number of frequencies; an IF generator for processing the reference signal to provide an IF signal at a selected intermediate frequency that is one of a given plural number of submultiples of the selected reference frequency; a comb generator for processing the reference signal to provide a comb of signals separated from each other by the selected reference frequency; and a phase-locked loop. The phase-locked loop includes a voltage controlled oscillator for providing a loop output signal at a selected synthesizer output frequency; a microwave directional coupler coupled to the output of the voltage controlled oscillator for providing a sample signal at the phase and frequency of the loop output signal; a mixer for mixing the sample signal with the comb of signals to provide a plurality of upper and lower sideband signals with respect to the synthesizer output frequency that are separated from each other by the selected reference frequency; and a phase detector for comparing the phase of the IF signal to the phase of the one of the plurality of sideband signals that is at a frequency closest to the intermediate frequency to thereby provide a comparison output signal. The synthesizer further includes a range selector circuit for providing a selected range control signal that is one of a given plural number of range control signals representative of different frequency ranges; and a summing device means for combining the selected range control signal with the comparison output signal to tune the voltage controlled oscillator to provide the loop output signal at the selected synthesizer output frequency.
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Callan Edward W.
General Dynamics Pomona Division
Grimm Siegfried H.
Johnson Edward B.
Martin Neil F.
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