Frequency synthesizer module for dual band radio

Details Frequency synthesizer module for dual band radio Frequency synthesizer module for dual band radio

1998-12-21

2000-05-23

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 16, 331 66, 331 68, 455259, 455260, H03L 102, H03L 706, H03L 7099, H03L 716

Patent

active

060669896

ABSTRACT:
A frequency synthesizer module with temperature compensation of a crystal oscillator circuit frequency controlled by a varactor. A module memory contains information characterizing a temperature dependency of a crystal which is applied to the varactor to temperature compensate the crystal in response to a temperature sensor signal. The module includes at least one locked loop circuit including a loop filter, at least one associated frequency divider, and a switchable dual band voltage controlled oscillator. The crystal oscillator is coupled to the at least one locked loop circuit and the frequency of the crystal is controlled by the memory via the varactor such that a temperature compensated output frequency is provided by the module.

REFERENCES:
patent: 5126699 (1992-06-01), Kabler

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