Frequency-agile synchronous demodulator

Details Frequency-agile synchronous demodulator Frequency-agile synchronous demodulator

1985-04-10

1986-12-09

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 81, 375120, H03D 302

Patent

active

046282700

ABSTRACT:
A frequency-agile synchronous demodulator for demodulating a carrier signal. The carrier signal is decomposed into in-phase and quadrature-phase components. Using the in-phase and quadrature-phase components, a first error signal is produced representing the phase difference between the carrier signal and a local oscillator signal. A reference signal, related to the frequency of the carrier signal by a factor N, is also input to the frequency-agile synchronous demodulator. The local oscillator signal is scaled by the factor N, and compared to the reference frequency signal in a phase detector. The phase detector produces a second error signal representing the phase difference between the reference signal and the local oscillator signal. The first error signal is integrated and summed with the second error signal. The resultant sum signal is integrated and input to the local oscillator for controlling the frequency and phase thereof. Generation of the second error signal ensures that the frequency-agile synchronous demodulator locks to the correct carrier frequency signal, rather than another signal on an adjacent frequency. The first error signal ensures a phase-locked condition.

REFERENCES:
patent: 3212023 (1965-10-01), Broadhead
patent: 3638125 (1972-01-01), Goell
patent: 3768030 (1973-10-01), Brown et al.
patent: 3769602 (1973-10-01), Griswood
patent: 4048566 (1977-09-01), Carson et al.
patent: 4238739 (1980-12-01), Mosley et al.
patent: 4408351 (1983-10-01), Maurer et al.
patent: 4465982 (1984-08-01), Jernakoff
patent: 4472685 (1984-09-01), Dutasta
IEEE Transactions on Communications, vol. COM-26, No. 1, Jan. 1978, "The False Lock Performance of Costas Loops with Hard-Limited In-Phase Channel", by M. K. Simon.
IEEE Transactions on Communications, vol. COM-26, No. 4, Apr. 1978, "Tracking Performance of Costas Loops with Hard-Limited In-Phase Channel", by M. K. Simon.

Affiliated with

Also associated with

Rating

Frequency-agile synchronous demodulator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency-agile synchronous demodulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency-agile synchronous demodulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1387347