Title:
TEMPERATURE COMPENSATION AND COARSE TUNE BANK SWITCHES IN A LOW PHASE NOISE VCO
Document Type and Number:
WIPO Patent Application WO/2012/119123
Kind Code:
A3
Abstract:
The LC tank of a VCO includes a main varactor circuit and temperature compensation varactor circuit coupled in parallel with the main varactor circuit. The main varactor is used for fine tuning. The temperature compensation varactor circuit has a capacitance- voltage characteristic that differs from a capacitance-voltage characteristic of the main varactor circuit such that the effects of common mode noise across the two varactor circuits are minimized. The LC tank also has a plurality of switchable capacitor circuits provided for coarse tuning. To prevent breakdown of the main thin oxide switch in each of the switchable capacitor circuits, each switchable capacitor circuit has a capacitive voltage divider circuit that reduces the voltage across the main thin oxide switch when the main switch is off.
Inventors:
ZHANG GANG (US)
Application Number:
PCT/US2012/027603
Publication Date:
January 10, 2013
Filing Date:
March 02, 2012
Export Citation:
Assignee:
QUALCOMM INC (US)
ZHANG GANG (US)
ZHANG GANG (US)
International Classes:
H03L1/02; H03L7/099; H03L7/10
Domestic Patent References:
WO2005104347A1 | 2005-11-03 |
Foreign References:
US20070085620A1 | 2007-04-19 | |||
US20050077970A1 | 2005-04-14 | |||
US20060238265A1 | 2006-10-26 | |||
US20070054629A1 | 2007-03-08 |
Attorney, Agent or Firm:
HO, Eric (5775 Morehouse DriveSan Diego, CA, US)
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