Frequency-selective oscillator

Details Frequency-selective oscillator Frequency-selective oscillator

2007-09-07

2009-12-08

Pascal, Robert (Department: 2817)

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

C331S002000, C331S158000

Reexamination Certificate

active

07629855

ABSTRACT:
The object of the present invention is to provide a frequency-selective oscillator capable of outputting two frequencies without hindering the downsizing of the device and capable of obtaining good output voltage characteristics. The frequency-selective oscillator includes a first crystal resonator and a second crystal resonator different in oscillation frequency from each other, and a first oscillation circuit and a second oscillation circuit corresponding to respective crystal resonators, in which a frequency-switching voltage is applied to selector terminals of the first and second oscillation circuits, a supply voltage Vcc is applied to a switching control terminal of the first oscillation circuit, a switching control terminal of the second oscillation circuit is grounded, Q outputs and inverted Q outputs of the oscillation circuits and are respectively connected and output from respective common signal lines. The frequency-selective oscillator can also be such that the common Q output and the common inverted Q output in the above structure are connected through an inductor L1.

REFERENCES:
patent: 5646580 (1997-07-01), Perkins
patent: 2004-070962 (2004-03-01), None
patent: 2005-142966 (2005-06-01), None
patent: 99/26336 (1999-05-01), None

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