Title:
ばらつき補正機能付き回路
Document Type and Number:
Japanese Patent JP4070492
Kind Code:
B2
Abstract:
A circuit with variation correction function is capable of obtaining an output characteristic near a desired value by suppressing variation of the output characteristic regardless of manufacturing characteristic variations of a component. An output signal different in phase from a reference signal is obtained by a dummy circuit having a capacitor of a same structure as a correction object capacitor in an operation circuit. The difference in phase between the reference signal and the output signal reflects manufacturing characteristic variation of the correction object capacitor. The difference in phase is detected by a phase comparator circuit and control signals are created by a control signal conversion circuit. Switches in the operation circuit are changed over with the control signal to adjust the capacitance of the correction object capacitor. The correction object capacitor is actuated at a capacitance near design capacitance regardless of manufacturing characteristic variation of the correction object capacitor.
Inventors:
Yonekawa Masayuki
Takei Doi
Takei Doi
Application Number:
JP2002098892A
Publication Date:
April 02, 2008
Filing Date:
April 01, 2002
Export Citation:
Assignee:
富士通株式会社
International Classes:
H01L21/822; H01L27/04; H03B5/04; H03B5/12; H03L1/00; H03L7/099
Domestic Patent References:
| JP6037247A | ||||
| JP2002076280A | ||||
| JP8264718A |
Attorney, Agent or Firm:
Ikuo Yamanaka
Takashi Tomizawa
Takashi Tomizawa