Title:
LOW-GAIN RANGE PROGRAMMABLE TEMPERATURE-COMPENSATING TYPE VOLTAGE-CONTROLLED OSCILLATOR
Document Type and Number:
Japanese Patent JPH06209260
Kind Code:
A
Abstract:
PURPOSE: To provide a voltage controlled oscillator which is less affected by the fluctuation of an input voltage signal and has plural low gain frequency ranges and generates an oscillator signal with a frequency fixed against the change of the ambient temperature. CONSTITUTION: A VGS and VSW generation circuit 310 electrically connected to three equivalent oscillator stages 318, 320, and 322 generates a gate-to-source voltage VGS and a switch voltage VSW in response to range selection signals RSO to RSS4. For the purpose of generating the oscillator signal, a variable resistance value is used to form each low gain range. For this oscillator signal, a small current source is used which supplies a certain current through the variable resistance and is practically independent of temperature, and a current is used which sucks and supplies an additional current to oscillators at the time of the rise and the fall of temperature respectively and is changed by temperature.
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Inventors:
MAIKERU AASAA BURAUN
Application Number:
JP17704293A
Publication Date:
July 26, 1994
Filing Date:
July 16, 1993
Export Citation:
Assignee:
NAT SEMICONDUCTOR CORP
International Classes:
E21B19/22; E21B33/068; E21B45/00; H03B5/04; G01P3/54; H03K3/011; H03K3/03; H03K3/354; H03K5/13; H03L1/02; H03L7/099; H03L7/10; (IPC1-7): H03L7/099; H03B5/04; H03L1/02
Attorney, Agent or Firm:
Kazuo Kobashi (1 person outside)