Oscillators – Phase shift type
Reexamination Certificate
2006-05-16
2006-05-16
Chang, Joesph (Department: 2817)
Oscillators
Phase shift type
C331S158000
Reexamination Certificate
active
07046096
ABSTRACT:
An oscillator circuit is a closed loop including an amplifying circuit and a feedback circuit. The amplifying circuit includes a pair of amplifiers, which also function as impedance buffers, and a first phase-shift circuit. The feedback circuit includes a second phase-shift circuit and a piezoelectric vibrator. The second phase-shift circuit is capable of adjusting the phase and gain of the feedback circuit. The first phase-shift circuit of the amplifying circuit is arranged between the pair of amplifiers and is separated, in terms of impedance, from the second phase-shift circuit. The first phase-shift circuit is capable of adjusting the phase of the entire closed loop.
REFERENCES:
patent: 4639697 (1987-01-01), Yarranton et al.
patent: 5874866 (1999-02-01), Satoh et al.
patent: 2003/0016090 (2003-01-01), Kobayashi
patent: 2004/0140857 (2004-07-01), Ogiso
patent: 11-163633 (1999-06-01), None
patent: 2001-289765 (2001-10-01), None
patent: 2003-101347 (2003-04-01), None
Patent Abstracts of Japan regarding Publication No. 11-163633 published Jun. 18, 1999.
Patent Abstracts of Japan regarding Publication No. 2001-289765 published Oct. 19, 2001.
Patent Abstracts of Japan regarding Publication No. 2003-101347 published Apr. 4, 2003.
Chang Joesph
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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