Charge-based frequency locked loop and method

Details Charge-based frequency locked loop and method Charge-based frequency locked loop and method

1996-06-20

1998-11-24

Callahan, Timothy P.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 14, 331 27, 331 34, 331 36R, 331 36C, H03L 7099

Patent

active

058413243

ABSTRACT:
A frequency locked loop (FLL) having an oscillator whose output frequency controls the amount of charge provided by a switched feedback capacitor to a charge integrator whose output voltage controls the frequency of the oscillator. A switched reference capacitor provides a charge to the charge integrator which is a function of a reference frequency, so that the oscillator output frequency is a function of a product of the reference frequency times a ratio of the capacitance of the reference capacitor to the capacitance of the feedback capacitor. Plural reference capacitors, each responsive to a respective reference frequency may be provided so that the oscillator output frequency can be related to the sums or differences of the reference frequencies, the ratios of capacitors, the ratio of the reference voltages or a fixed multiplication factor.

REFERENCES:
patent: 4849663 (1989-07-01), Kunze et al.
patent: 4987373 (1991-01-01), Soo
patent: 5124593 (1992-06-01), Michel
patent: 5239455 (1993-08-01), Fobbester et al.
patent: 5384554 (1995-01-01), Abernethy
patent: 5408174 (1995-04-01), Leonowich

Affiliated with

Also associated with

Rating

Charge-based frequency locked loop and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Charge-based frequency locked loop and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Charge-based frequency locked loop and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1707449