Title:
VARIABLE CAPACITOR AND CRYSTAL OSCILLATOR
Document Type and Number:
Japanese Patent JP2000134036
Kind Code:
A
Abstract:
To easily test a switching control circuit of a capacitor array in a temperature compensation circuit for a crystal oscillator.
Each array is provided with transfer gates 91-96 that are switched on/off with the output of a linear control circuit and a test signal TEST so as to monitor the gate level of each FET switch from a monitor terminal MO. Then only the gate level of the FET switches of the units whose decoder output is active is selectively outputted to the terminal MO.
Inventors:
IMAMURA YOICHI
Application Number:
JP27312299A
Publication Date:
May 12, 2000
Filing Date:
December 05, 1989
Export Citation:
Assignee:
SEIKO EPSON CORP
International Classes:
H01G7/00; H01L21/822; H01L27/04; H03B5/32; H03B5/36; (IPC1-7): H03B5/32; H01G7/00; H01L21/822; H01L27/04
Attorney, Agent or Firm:
Kisaburo Suzuki (2 outside)