Title:
温度補償型R-C発振器
Document Type and Number:
Japanese Patent JP2006510309
Kind Code:
A
Abstract:
An R-C oscillator ( 200 ) is configured to vary the two voltage levels that are used to control the oscillation, such that the variation in oscillation frequency with temperature is minimized. A first resistor (R 1 ) is used to control one of the voltage levels, and a second resistor (R 2 ) having a temperature coefficient that differs from the temperature coefficient of the first transistor is used to control the other voltage level. The first resistor (R 1 ) also controls the current used to charge and discharge the capacitor (C) used to effect the oscillation. By the appropriate choice of resistance values, the variations of the control voltages and current are such that the time to charge and discharge the capacitor (C) between the control voltages remains substantially constant with temperature. Preferably the resistance values are selected to also compensate for temperature variations in the delay of the feedback loop.
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Inventors:
John, M. Yarborough, Jr.
Application Number:
JP2004560113A
Publication Date:
March 23, 2006
Filing Date:
December 15, 2003
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H03K4/501; H03B5/04; H03K3/011; H03K3/0231
Attorney, Agent or Firm:
Kenji Yoshitake
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Jun Okazawa
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki
Jun Okazawa