Title:
LOW GAIN RANGE PROGRAMMABLE TEMPERATURE COMPENSATION-TYPE VOLTAGE CONTROLLED OSCILLATOR
Document Type and Number:
Japanese Patent JP3163205
Kind Code:
B2
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.
Inventors:
Michael arthur brown
Application Number:
JP17704293A
Publication Date:
May 08, 2001
Filing Date:
July 16, 1993
Export Citation:
Assignee:
National Semiconductor Corporation
International Classes:
E21B19/22; E21B33/068; E21B45/00; G01P3/54; H03B5/04; H03K3/011; H03K3/03; H03K3/354; H03K5/13; H03L1/02; H03L7/099; H03L7/10; (IPC1-7): H03L7/099; H03K3/354; H03L1/02; H03L7/10
Domestic Patent References:
| JP2235428A | ||||
| JP3206726A | ||||
| JP3252216A | ||||
| JP4296113A |
Other References:
【文献】米国特許4876519(US,A)
【文献】米国特許5061907(US,A)
【文献】米国特許4978930(US,A)
【文献】欧州特許出願公開249665(EP,A1)
【文献】欧州特許出願公開253135(EP,A1)
【文献】米国特許5061907(US,A)
【文献】米国特許4978930(US,A)
【文献】欧州特許出願公開249665(EP,A1)
【文献】欧州特許出願公開253135(EP,A1)
Attorney, Agent or Firm:
Kazuo Kobashi (1 person outside)