Title:
温度安定化された電圧制御発振器
Document Type and Number:
Japanese Patent JP2007531471
Kind Code:
A
Abstract:
A Voltage Controlled Oscillator (VCO) in a battery-powered device, such as a cellular phone, can be configured to tune across a fairly wide frequency range using a relatively narrow control voltage range. The frequency response of the VCO can be temperature compensated by applying a temperature variable voltage source to varactors that form part of a VCO resonant circuit. The reference end of the varactor can be supplied with a temperature dependent voltage source that has a temperature dependence that substantially compensates for varactor temperature dependence. The temperature dependent voltage source can be a Proportional To Absolute Temperature (PTAT) device.
Inventors:
Aparin, Vladimir
U, Yue
U, Yue
Application Number:
JP2007506232A
Publication Date:
November 01, 2007
Filing Date:
March 21, 2005
Export Citation:
Assignee:
QUALCOMM INCORPORATED
International Classes:
H03B5/04; H03B5/08; H03B5/12; H03L1/02; H03L7/099
Domestic Patent References:
| JP2001313527A | 2001-11-09 | |||
| JPH05505068A | 1993-07-29 | |||
| JPS56146308A | 1981-11-13 | |||
| JP2002290151A | 2002-10-04 | |||
| JPH022721A | 1990-01-08 | |||
| JP2004056720A | 2004-02-19 | |||
| JPS63107311A | 1988-05-12 |
Foreign References:
| WO2002065639A1 | 2002-08-22 | |||
| US6225871B1 | 2001-05-01 |
Attorney, Agent or Firm:
Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Katsu Sunagawa
Ryo Hashimoto
Tetsuya Kazama
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Katsu Sunagawa
Ryo Hashimoto
Tetsuya Kazama