Frequency synthesizer with controllable loop filter

Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

331 8, 331 14, 331 16, 331 23, 331 36C, 331177V, 332127, 327157, 327105, 455260, H03L 708, H03L 7093, H03L 7099, H03L 718

Patent

active

055594743

ABSTRACT:
In accordance with a loop open/close control signal, an analog switch closes or opens a loop including a voltage controlled oscillator, a variable frequency divider, a phase comparator, and a first loop filter, the analog switch, and a second loop filter. In order to reduce the change of frequency caused when the open loop state is set immediately after the output frequency is changed, the second loop filter uses a capacitor which shows properties of a small change of capacitance in response to an applied voltage and a small hysteresis. In another embodiment, the voltage controlled oscillator includes a second diode, one terminal of which is grounded, connected in reverses parallel to a first diode switch which switches the output oscillation frequency ranges of the voltage controlled oscillator.

REFERENCES:
patent: 4433308 (1984-02-01), Hirata
patent: 4510461 (1985-04-01), Dickes et al.
patent: 4980653 (1990-12-01), Shepherd
patent: 5053724 (1991-10-01), Ogino et al.
patent: 5095288 (1992-03-01), Dent
patent: 5302919 (1994-04-01), Abe
patent: 5334954 (1994-08-01), Koblitz et al.
patent: 5420545 (1995-05-01), Davis et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Frequency synthesizer with controllable loop filter 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 synthesizer with controllable loop filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency synthesizer with controllable loop filter will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1931634

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.