Automatic frequency control circuit

Details Automatic frequency control circuit Automatic frequency control circuit

H - Electricity

03

J

H03J 7/06 (2006.01) H04B 1/26 (2006.01)

Patent

CA 2071421

An automatic frequency control (AFC) circuit receives input signals and generates converted signals by mixing the input signals with a local oscillation signal. An extraction circuit extracts a pilot signal, if present, from the input signals and provides the pilot signal to a switch. A frequency divider divides a frequency of the local oscillation signal output from a voltage controlled oscillator, and provides the frequency-divided local oscillation signal to the switch. The output of the switch is compared with a reference frequency in a phase comparator which generates a comparison result which controls the voltage controlled oscillator. If the pilot signal is not present, the switch selects the frequency-divided oscillation signal, to construct a phase-locked loop to stabilize the frequency of the local oscillation signal. Alternatively, an AFC circuit includes a frequency divider for selectively dividing a frequency of a pilot signal included in the converted signal. Various frequencies of the pilot signal can be received by altering a division number in the frequency divider.

Affiliated with

Also associated with

Rating

Automatic frequency control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic frequency control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic frequency control circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1366131