Crystal oscillation circuit with frequency regulation

Details Crystal oscillation circuit with frequency regulation Crystal oscillation circuit with frequency regulation

2007-10-23

2007-10-23

Pascal, Robert (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S03600C, C331S160000, C331S183000

Reexamination Certificate

active

10506076

ABSTRACT:
It is an object of the invention to obtain a stable operation with a low phase noise. Moreover, it is another object to obtain an oscillating output which does not cause the delay of a starting time. According to the invention, it is possible to implement a crystal oscillating circuit capable of superposing a signal obtained by feeding back the oscillating output of a crystal oscillating member (10) by a feedback circuit (5) on a control signal for selecting the load capacity of a load capacity selecting portion (3), and influencing an MOS transistor (50) by the voltage noise of the control signal with difficulty, thereby reducing a phase noise, and furthermore, limiting a control signal to be input to the load capacity selecting portion (3) for a certain time in starting and carrying out the starting in a short time.

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patent: 9-102714 (1997-04-01), None
patent: 2000-31741 (2000-01-01), None

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