Oscillator circuit having stable frequency

Details Oscillator circuit having stable frequency Oscillator circuit having stable frequency

2006-10-31

2006-10-31

Chang, Joseph (Department: 2817)

Oscillators

Phase shift type

C331S143000, C331S057000, C331S176000

Reexamination Certificate

active

07129798

ABSTRACT:
An oscillator includes first, second and third inverters (1, 2, 3) connected in series. A feedback path is connected from the output terminal of the third inverter (3) to the input terminal of the first inverter1through a resistor (5) while a second feedback path is connected from the output terminal of the second inverter (2) to the input terminal of the first inverter (1) through a capacitor (4). The second feedback path further includes a resistor (6) having a temperature coefficient larger than that of resistor (5) is inserted to adjust the charge/discharge trigger voltage and charge/discharge time of the capacitor (4).

REFERENCES:
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patent: 5180995 (1993-01-01), Hayashi et al.
patent: 5485429 (1996-01-01), Ono
patent: 2002/0000889 (2002-01-01), Kim
patent: 2003/0184395 (2003-10-01), Nagatomo
patent: U-54-181853 (1979-12-01), None
patent: A-58-17723 (1983-02-01), None
patent: A-H01-236704 (1989-09-01), None
patent: A-H05-304417 (1993-11-01), None
patent: A-6-338721 (1994-12-01), None
patent: A-2000-106521 (2000-04-01), None
patent: A-2001-102866 (2001-04-01), None
Notification of Reason(s) for Refusal issued from Japanese Patent Office issued on Oct. 18, 2005 for the corresponding Japanese patent application No. JP-2002-306085 (a copy and English translation thereof).

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