Oven-controlled crystal oscillator

Details Oven-controlled crystal oscillator Oven-controlled crystal oscillator

2009-02-19

2011-11-01

Pascal, Robert (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S10800D, C331S158000

Reexamination Certificate

active

08049572

ABSTRACT:
An oven-controlled crystal oscillator includes a circuit board, a crystal unit surface-mounted on the circuit board, and a temperature control circuit that maintains operating temperature of the crystal unit constant. The temperature control circuit includes a heating resistor, a power transistor that supplies power to a heating resistor, and a temperature sensitive resistor that detects temperature of the crystal unit. The heating resistor is formed, as a film resistor, on a surface of the circuit board in an area thereof in which the crystal unit is located. The temperature sensitive resistor is provided on the circuit board as a film resistor.

REFERENCES:
patent: 7345552 (2008-03-01), Ito et al.
patent: 7382204 (2008-06-01), Arai et al.
patent: 1-146618 (1989-10-01), None
patent: 2001-127579 (2001-05-01), None
patent: 2001-308640 (2001-11-01), None
patent: 2002324418 (2002-11-01), None
patent: 2003112838 (2003-04-01), None
patent: 2006-311496 (2006-11-01), None

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