Title:
CAPACITY TRIMMING CIRCUIT
Document Type and Number:
Japanese Patent JP2015125088
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To simply perform prior adjustment of capacitance with high accuracy in a CV conversion circuit using an all differential amplifier.SOLUTION: A capacity trimming circuit 7 comprises: a capacity trimming part 5 which adjusts capacitance to be connected to each of two input terminals of an all differential amplifier 21 into approximately the same state by performing adjustment by using a plurality of trimming capacitors 51 which can be connected or disconnected to the input terminals of the all differential amplifier 21; and a capacity division generation part 6 which generates voltage V1 to which capacity division is performed by a first capacitor 8 by applying reference voltage Vc to one end of a first feedback capacitor Cf1, and generates voltage V2 to which the capacity division is performed by a second capacitor 9 by applying the reference voltage Vc to one end of a second feedback capacitor Cf2 when the adjustment of the capacitance is performed by the capacity trimming part 5, and operates the all differential amplifier 21 as a comparator which outputs a comparison result between the voltage V1, V2.
Inventors:
TSUJI NOBUAKI
Application Number:
JP2013270851A
Publication Date:
July 06, 2015
Filing Date:
December 27, 2013
Export Citation:
Assignee:
MURATA MANUFACTURING CO
International Classes:
G01P15/125; G01D5/241; H03F3/343; H03F3/45
Attorney, Agent or Firm:
Samejima Mutsumi
Kyousei Tamura
Yoshida Tamaki
Kyousei Tamura
Yoshida Tamaki