H - Electricity – 03 – L
Patent
H - Electricity
03
L
331/32
H03L 7/00 (2006.01) H03C 3/09 (2006.01)
Patent
CA 1038462
HOMODYNE AUTOMATIC FREQUENCY CONTROL CIRCUIT Abstract Homodyne automatic frequency control circuitry maintains the mean or center output frequency of a con- trolled oscillator, e.g., the output of a voltage controlled oscillator effecting frequency modulation, equal to the output frequency of a reference oscillator. The composite AFC circuitry employs ganged sampling switches and a frequency detector (e.g., a discriminator) to alternately store voltages representative of the reference and con- trolled oscillator frequencies in capacitors connected to the inputs of a difference amplifier. The difference amplifier acts through an integrator to supply any necessary correction potential to the control port of the controlled oscillator when the signals stored in the two capacitors differ, signalling that the mean output frequency of the controlled oscillator has departed from that of the reference oscillator. By employing the frequency-to-voltage transfer characteristic of a common discriminator to generate the potential in each of the two storage capacitors responsive to the frequency inputs supplied by the reference oscillator and the controlled oscillator, variations in the discrimin- ator transfer characteristic caused by ambient conditions, aging or the like are negated by the common mode nulling action of the difference amplifier.
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