Micro-controller based frequency calibration

Details Micro-controller based frequency calibration Micro-controller based frequency calibration

1997-03-04

1999-10-05

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

375222, 455557, 455205, H04L 2700, H04B 138, H04B 116

Patent

active

059636009

ABSTRACT:
A radio modem is disclosed that includes a radio receiver for receiving radio signals comprising data frequency multiplexed onto a carrier signal having a carrier frequency. An oscillator generates a reference frequency for an FM discriminator, which is connected to the antenna and to the for demodulating said data from said radio signals using said reference frequency. A microprocessor has an input connected to the output of the FM discriminator. The microprocessor also has an output. The microprocessor is programmed to sample the signal voltage output by the FM discriminator, average the signal voltage samples, and compare the average to a preset voltage. The microprocessor is programmed so that if the average differs from the preset voltage, the microprocessor generates an error signal at the microprocessor output. The oscillator is coupled to the microprocessor output so that the error signal adjusts the frequency of the oscillator.

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patent: 5805984 (1998-09-01), Tangen

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