Oscillator circuit and oscillator

Details Oscillator circuit and oscillator Oscillator circuit and oscillator

2006-07-11

2006-07-11

Pascal, Robert (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S175000, C331S179000

Reexamination Certificate

active

07075381

ABSTRACT:
The present invention relates to a crystal oscillator circuit in which the output level is maintained to prevent changes in oscillation frequency due to variations in power voltage. This crystal oscillator circuit comprises a resonance circuit formed of a crystal oscillator (which acts as an inductor component) and dividing capacitors, an oscillation amplifier formed of ECL circuitry driven by a power voltage connected to the resonance circuit, and a pull-down resistor between an output terminal of the ECL circuit and ground. The pull-down resistor acts as serially-connected dividing resistors and also a bias capacitor is provided between a connection point between those dividing resistors and ground. The present invention also relates to a frequency-switching oscillator having a simple circuit design and a small number of components. This frequency-switching oscillator enables a configuration in which an oscillation amplifier that is a two input, two output type of ECL circuit having mutually inverted signals is connected to a resonance circuit formed of a crystal oscillator and dividing capacitors; a first resonance circuit provided with a first electronic switch is connected between one pair of input-output terminals for mutually inverted signals of the ECL circuit; a second resonance circuit is connected between another pair of input-output terminals for mutually inverted signals of the ECL circuit; and the resonance frequencies of the first and second resonance circuits are different and also the first and second electronic switches are switched to select one of the resonance circuits.

REFERENCES:
patent: 5136263 (1992-08-01), Lane
patent: 5270670 (1993-12-01), Bladh
patent: 5627498 (1997-05-01), Meyer
patent: 5646580 (1997-07-01), Perkins
patent: 6172574 (2001-01-01), Sirito-Olivier
patent: 6433309 (2002-08-01), Hashimoto et al.
patent: 6559730 (2003-05-01), Marvin et al.
patent: 6933794 (2005-08-01), Ogiso
patent: 2001/0006357 (2001-07-01), Yamamoto
patent: 0 794 611 (1997-09-01), None
patent: 2002-359521 (2002-12-01), None
European Search Reort dated Jan. 27, 2005.
“Crystals Made Clear II,” Electronics World, Oct. 1999.

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