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Title: US7332977: Crystal clock generator operating at third overtone of crystal's fundamental frequency
[ Derwent Title ]

Country: US United States of America

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16 pages

 
Inventor: Drakhlis, Boris; Mountain View, CA, United States of America
Liu, Wing Faat; San Jose, CA, United States of America
Taylor, Craig M.; Pleasanton, CA, United States of America
Yeung, Tony; Milpitas, CA, United States of America

Assignee: Pericom Semiconductor Corp., San Jose, CA, United States of America
other patents from PERICOM SEMICONDUCTOR CORP. (713978) (approx. 58)
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Published / Filed: 2008-02-19 / 2005-12-21

Application Number: US2005000306262
IPC Code: Advanced: H03B 27/00;
Core: more...

ECLA Code: H03B5/36; H03B5/36B;

U.S. Class: Current: 331/046; 331/049; 331/053; 331/074; 331/116.R; 331/116.FE; 331/158;
Original: 331/046; 331/049; 331/053; 331/158; 331/116.R; 331/116.FE; 331/074;

Field of Search: 331/046,158,116 R,116 FE,74,45,49,53

Priority Number:
2005-12-21  US2005000306262
2004-07-20  US2004000710549

Abstract:     A crystal oscillator operates at the third overtone of the crystal's fundamental frequency. A value of a shunt resistor between the two phase-shift leg nodes is chosen so that the absolute value of the product gmx(Xc 1 )x(Xc 2 ) is greater than the effective reactance of the crystal, where gm is the gain of the amplifier attached to the phase-shift legs, and Xc 1 and Xc 2 are the effective capacitive reactances of phase-shift legs at nodes X 1 and X 2 . The third overtone is doubled by a multiplier and the final output filtered to remove the third overtone and select a frequency six times the fundamental frequency. A pair of Colpitts or Pierce amplifier half circuits is attached to the phase-shift leg nodes. The leg nodes can be capacitively isolated from Pierce-amplifier circuit nodes to improve start-up. Frequency doubling can be performed by summing currents from the two oscillator half circuits.

Attorney, Agent or Firm: Auvinen, Stuart T. ; g Patent LLC ;

Primary / Asst. Examiners: Kinkead, Arnold;

INPADOC Legal Status: None          Buy Now: Family Legal Status Report

       
Related Applications:
Application Number Filed Patent Pub. Date  Title
US2004000710549 2004-07-20    2006-02-21  Crystal clock generator operating at third overtone of crystal's fundamental frequency


       
Parent Case: RELATED APPLICATION
    This is a continuation of U.S. Ser. No. 10/710,549, filed Jul. 20, 2004, now U.S. Pat. No. 7,002,423.

Family: Show 3 known family members
First Claim:
Show all 17 claims		     1. A frequency multiplier circuit for generating at a circuit output node a circuit output signal having a frequency that is related to an oscillating frequency of a crystal, comprising:

a first oscillator circuit coupled to a first node of the crystal and configured to generate at a first output node a first output signal having a first frequency that is substantially same as the oscillating frequency of the crystal;

a second oscillator circuit coupled to a second node of the crystal and configured to generate at a second output node a second output signal having a second frequency that is substantially same as the first frequency, the second output signal being approximately 180 degree out of phase with the first output signal; and

a summing device connected to the first and the second output nodes for generating the circuit output signal having a frequency that is substantially twice the oscillating frequency of the crystal.

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U.S. References: Go to Result Set: All U.S. references   |  No patents reference this one   |   Backward references (3)   |   Citation Link

Buy
PDF		 Patent  Pub.Date  Inventor Assignee   Title
Buy PDF- 12pp US4144747  1979-03 Datwyler, Jr.  The Bendix Corporation Simultaneously resonated, multi-mode crystal force transducer
Buy PDF- 18pp US6249190  2001-06 Rozenblit et al.  Conexant Systems, Inc. Differential oscillator
Buy PDF- 23pp US7088188  2006-08 Fredriksson  Telefonaktiebolaget LM Ericsson (publ) Differential oscillator
       
Foreign References: None

Continuity Data:
Application Number Filed Notes
US2005000306262 2005-12-21  is a related to the prior publication
     US20070069826A1 issued 2007-03-29  Crystal Clock Generator Operating at Third Overtone of Crystal's Fundamental Frequency
>US2005000306262< 2005-12-21  is a continuation of
US2004000710549  2004-07-20   (granted)
     US7002423 issued 2006-02-21   Crystal clock generator operating at third overtone of crystal's fundamental frequency
11306262   is a continuation of
US2004000710549  2004-07-20
     US7002423 issued 2006-02-21   Crystal clock generator operating at third overtone of crystal's fundamental frequency


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