Title:
【発明の名称】低電圧電圧制御発振器温度補正
Document Type and Number:
Japanese Patent JPH05505068
Kind Code:
A
Abstract:
A circuit for temperature compensation of a varactor voltage controlled oscillator control signal includes a proportional to absolute temperature (PTAT) current source and an adjustable, temperature stable current source. The difference between these two current sources defines an offset current. The varactor control signal voltage is shifted by a predetermined reference voltage and offset by an offset voltage proportional to the offset current, in a differential amplifier portion of the circuit, to provide a tuning signal for controlling the varactor so as to compensate for the varactor capacitance temperature drift. The adjustable, temperature stable current source allows tuning the circuit in order to precisely tune the VCO to a desired frequency under a predetermined set of operating conditions in order to correct component and process variations.
Inventors:
Suter Richard Earl
Application Number:
JP51110690A
Publication Date:
July 29, 1993
Filing Date:
July 17, 1990
Export Citation:
Assignee:
Seiko Corporation
Seiko Epson Corporation
Seiko Epson Corporation
International Classes:
H03B5/04; H03B5/12; H03L1/02; H03L7/099; H03B1/00; (IPC1-7): H03B5/04; H03B5/12; H03L7/099
Attorney, Agent or Firm:
Minoru Nakamura (6 outside)