Method and apparatus for reducing the start time of a VCXO

Details Method and apparatus for reducing the start time of a VCXO Method and apparatus for reducing the start time of a VCXO

2006-03-07

2006-03-07

Mis, David (Department: 2817)

Oscillators

With synchronizing, triggering or pulsing circuits

Triggering or pulsing

C331S158000, C331S17700V, C331S185000

Reexamination Certificate

active

07009460

ABSTRACT:
A voltage controlled oscillator, such as a VCXO (Voltage Controlled Crystal Oscillator), for generating a desired reference frequency in a wireless terminal with a reduced start-up time is described herein. According to the present invention, the VCXO comprises an oscillator that generates the desired reference frequency based on a variable voltage applied to the oscillator by a voltage controller. In addition, the VCXO includes a start-up controller that applies a bias voltage to an oscillator input node to reduce a capacitance associated with the oscillator, and therefore, to reduce the start-up time without negatively impacting the DC current consumption or the tuning range of the VCXO.

REFERENCES:
patent: 5534826 (1996-07-01), Logan
patent: 5844448 (1998-12-01), Jackoski et al.
patent: 2002/0171500 (2002-11-01), Eichi et al.
patent: 0 709 965 (1996-05-01), None
patent: 03155206 (1991-07-01), None
Wessendorf, Kurt and Payne, Tom,; “Oscillator Design Techniques Allow High Frequency Applications of Inverted Mesa Resonators,” www.sss-mag.com/pdf/saosc.pdf.
Jackson, Said, “VCXO makes inexpensive dual-clock reference,” EDN, Nov. 27, 2003, pp. 92, 94, 96.
PCT International Search Report; International Application No. PCT/US2005/002493 mailed Jun. 29, 2005.

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