Low phase noise variable frequency oscillator

Oscillators – Solid state active element oscillator – Transistors

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C331S17700V, C331S179000, C331S1070SL, C331S1170FE, C331S167000

Reexamination Certificate

active

06549084

ABSTRACT:

BACKGROUND
1. Field
The present invention relates generally to RF oscillators and more particularly to voltage control oscillators designed to provide low phase noise.
2. Prior Art
There a number of U.S. patent references relating to variable frequency oscillator circuits which exhibiting low phase noise including U.S. Pat. Nos. 5,357,218, 5,185,583, 5,512,862, 5,268,657, 5,625,327, and 4,593,256. One of the principle methods of producing low phase noise in a variable frequency oscillator that is found in all of these references is the use of a resonator circuit with a high loaded Q. The principal way of obtaining a high loaded Q is to tap into the resonator rather than connect directly across it. This method transforms the impedance placed across the tap to a higher impedance across the entire resonator, thereby raising the loaded Q of the resonator. All of the reference patents use a tapped resonator in one form or another. Most connect into a direct tap on an inductor; however, in U.S. Pat No. 5,625,327 the tap is made by a capacitive divider across the resonator.


REFERENCES:
patent: 4146850 (1979-03-01), Fache et al.
patent: 5748051 (1998-05-01), Lewis

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

Low phase noise variable frequency oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low phase noise variable frequency oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low phase noise variable frequency oscillator will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3096040

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