Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means
Reexamination Certificate
2007-12-04
2007-12-04
Wells, Kenneth B. (Department: 2816)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular frequency control means
C331S034000, C331S040000
Reexamination Certificate
active
11360184
ABSTRACT:
An apparatus providing a simple low cost integrated circuit oscillator with improved frequency stability over a range of selected frequencies by reducing the impact of process and temperature variations on a base current of bipolar transistor of the integrated circuit oscillator. A circuit includes a capacitor coupled to be alternatingly charged and discharged by first and second current sources. A first voltage follower circuit including a first bipolar transistor having a base is coupled to the capacitor. The first bipolar transistor is biased such that a voltage at an emitter of the first bipolar transistor follows a voltage on the capacitor. A current mirror having first and second current paths is included. The first current path is coupled to the base of the first bipolar transistor. The first current path provides substantially all of a base current received by the base of the first bipolar transistor. A second voltage follower circuit including a second bipolar transistor having a base coupled to the second current path is included. The second current path provides substantially all of a base current received by the base of the second bipolar transistor.
REFERENCES:
patent: 4009398 (1977-02-01), Yamada et al.
patent: 4598259 (1986-07-01), Gontowski, Jr.
patent: 4602172 (1986-07-01), Kikuchi
patent: 4803381 (1989-02-01), Gornati et al.
patent: 5045800 (1991-09-01), Kung
patent: 5359298 (1994-10-01), Abe
patent: 5387882 (1995-02-01), Schoofs
patent: 5444422 (1995-08-01), Mycynek
patent: 5455493 (1995-10-01), Pulluru et al.
patent: 5644270 (1997-07-01), Moyer et al.
patent: 5870000 (1999-02-01), Matsuda et al.
patent: 6194935 (2001-02-01), Pioppo et al.
patent: 6339349 (2002-01-01), Rajagopalan
patent: 6614313 (2003-09-01), Crofts et al.
patent: 04254534 (2005-02-01), None
patent: 2836762 (2003-09-01), None
Blakely , Sokoloff, Taylor & Zafman LLP
Luu An T.
Power Integrations, Inc.
Wells Kenneth B.
LandOfFree
Method and apparatus to improve frequency stability of an... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus to improve frequency stability of an..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus to improve frequency stability of an... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3885807