Programmable-step, high-resolution frequency synthesizer which s

Details Programmable-step, high-resolution frequency synthesizer which s Programmable-step, high-resolution frequency synthesizer which s

1991-05-13

1992-09-08

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 11, 331 18, 331 19, 455260, H03L 707, H03L 716, H03L 722

Patent

active

051461862

ABSTRACT:
A frequency synthesizer is described which operates over a wide frequency range at high resolution and variable step size without trading off between spurious frequency rejection and phase noise suppression. The synthesizer includes a magnetically-turned YIG oscillator which generates a desired output frequency from a received tuning signal. The output signal is fed back into a phase locked loop which generates the tuning signal. The phase locked loop includes a harmonic mixer for mixing the output signal with a reference frequency F.sub.2. The mixer receives a base frequency signal and a harmonic select signal resulting in the generation of the reference signal, F.sub.2. The mixed signal is input to a programmable divider, then to a phase detector which receives another reference signal, F.sub.1. The phase detector output is the tuning signal which is coupled to the YIG oscillator. Both reference frequencies, F.sub.1 and F.sub.2, are derived from a common base frequency. A base frequency source includes a voltage-controller oscillator coupled to another phase locked loop. This other phase locked loop receives two reference signals, F.sub.x and F.sub.y. Reference F.sub.x preferably is generated by a direct digital synthesizer that receives programmable tuning parameters. Reference F.sub.y may be generated with a fixed, switched or other frequency source. A microprocessor is included for selecting the programmable divider factors, the direct digital synthesizer tuning parameters, and other variable factors.

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