Crystal oscillator frequency tuning circuit

Details Crystal oscillator frequency tuning circuit Crystal oscillator frequency tuning circuit

2007-08-10

2009-12-29

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S158000, C331S17700V

Reexamination Certificate

active

07639092

ABSTRACT:
Embodiments feature techniques and systems for analog and digital tuning of crystal oscillators. In one aspect, some implementations feature a method for tuning a frequency of a crystal oscillator that can include adjusting the tuning frequency of the crystal oscillator from a nominal frequency via a switched-capacitor frequency tuning circuit, the switched-capacitor frequency tuning circuit can have switchable sections to adjust the tuning of the crystal oscillator. The method can include controlling an analog control input that is coupled to a varactor within each of the switchable sections, where each of the switchable sections can include a fixed capacitor in series with the varactor and a switch. The method can involve controlling a digital control input, where the digital control input can electrically connect or disconnect one or more of the switchable sections from the crystal. There can be independent control between the digital and analog tuning mechanisms.

REFERENCES:
patent: 5084685 (1992-01-01), Möller et al.
patent: 5117206 (1992-05-01), Imamura
patent: 5117234 (1992-05-01), Shizawa
patent: 5874864 (1999-02-01), Muto et al.
patent: 6181218 (2001-01-01), Clark et al.
patent: 6304152 (2001-10-01), Takahashi et al.
patent: 6747522 (2004-06-01), Pietruszynski et al.
patent: 6788159 (2004-09-01), Takahashi et al.
patent: 6980139 (2005-12-01), Doerrer et al.
Notification of Transmittal of the International Search Report and the Written Opinion of the International Search Authority, or the Declaration, PCT/SU07/75691, mailed Sep. 24, 2008.

Affiliated with

Also associated with

Rating

Crystal oscillator frequency tuning circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Crystal oscillator frequency tuning circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystal oscillator frequency tuning circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4053945