Center frequency calibration for DC coupled frequency modulation

Details Center frequency calibration for DC coupled frequency modulation Center frequency calibration for DC coupled frequency modulation

1992-02-21

1992-09-22

Mis, David

Modulators

Frequency modulator

Including stabilization or alternatively distortion, noise...

331 23, 455113, H03L 7081, H03L 716, H03C 300

Patent

active

051500825

ABSTRACT:
A method of providing DC coupled frequency modulation without center frequency offset of a RF carrier frequency generated in a phase-locked loop circuit. The circuit is automatically calibrated to generate a feedback signal for cancelling DC offsets at the input of the coupling integrator with a digital-to-analog converter and resistor network driven by a digital counter. After removing frequency modulation, the coupling integrator's output will ramp while the offsets remain uncancelled. Incrementing or decrementing the digital counter in response to the integrator's output will adjust the feedback signal until the offsets are cancelled and the integrator ceases to ramp. The counter value is stored in a memory to allow subsequent presetting of the feedback signal to the calibrated magnitude. Holding the feedback signal constant thereafter during DC coupled frequency modulation keeps the RF carrier at center frequency.

REFERENCES:
patent: 4546331 (1985-10-01), DaSilva et al.
patent: 5038120 (1991-08-01), Wheatley et al.

Affiliated with

Also associated with

Rating

Center frequency calibration for DC coupled frequency modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Center frequency calibration for DC coupled frequency modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Center frequency calibration for DC coupled frequency modulation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1071764