Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2006-02-21
2006-02-21
Kinkead, Arnold (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S1160FE, C331S1160FE, C331S074000, C331S1070DP
Reexamination Certificate
active
07002423
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 gm×(Xc1)×(Xc2) is greater than the effective reactance of the crystal, where gm is the gain of the amplifier attached to the phase-shift legs, and Xc1and Xc2are the effective capacitive reactances of phase-shift legs at nodes X1and X2. 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.
REFERENCES:
patent: 4388626 (1983-06-01), Gans
patent: 4661785 (1987-04-01), Benjaminson
patent: 5126694 (1992-06-01), Montress et al.
patent: 5263197 (1993-11-01), Manjo et al.
patent: 6057740 (2000-05-01), Consolazio et al.
patent: 6091307 (2000-07-01), Nelson
patent: 6169459 (2001-01-01), Wessendorf
patent: 6667666 (2003-12-01), Uzunoglu
patent: 6677862 (2004-01-01), Houlihane et al.
patent: 2003/0134610 (2003-07-01), DiCamillo
Wessendorf & Payne, “Oscillator Design Techniques Allow High Frequency Applications of Inverted Mesa Resonators” SaRonix/Sandia Nat'l Labs, Spread Spectrum Scene Magazine (sss-mag.com) Feb. 1998 ?, pp. 1-8.
PhaseLink Corp. P560-xx Web page Apr. 22, 2004, 1 page.
Tsien, Li Lei “Using PhaseLink Integrated XO/VCXO IC's as 3rdOvertone PECL XO Drivers” Application Note Aug. 3, 8 pages.
Drakhlis Boris
Liu Wing Faat
Taylor Craig M.
Yeung Tony
Auvinen Stuart T.
Kinkead Arnold
Pericom Semiconductor Corp.
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