Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Frequency or repetition rate conversion or control
Patent
1997-12-04
1999-05-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Frequency or repetition rate conversion or control
327141, H03B 1900
Patent
active
059007516
ABSTRACT:
In an automatic frequency control circuit, a circuit constitution thereof is simplified without decreasing performance of demodulation. In the control circuit, a frequency counter counts a number of regenerative intermediate frequency from an intermediate frequency or a wave detection circuit, then a magnitude comparator compares an output of the frequency counter with a prescribed comparison data, before a subtraction circuit subtracts the output of the frequency counter from the prescribed comparison data. An operation part implements required operation according to an output of the magnitude comparator and an output of the subtraction circuit. A D/A converter converts an output data of the operation part into an analog signal. A TCXO oscillates an oscillation frequency according to the analog signal of the D/A converter. A variable frequency demultiplier is connected to a stage in front of the frequency counter. Due to this constitution, it is capable of compensating a frequency deviation of the TCXO without in use of a divider.
Callahan Timothy P.
NEC Corporation
Zweizig Jeffrey
LandOfFree
Automatic frequency control circuit with simplified circuit cons 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 with simplified circuit cons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic frequency control circuit with simplified circuit cons will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1871837