Title:
VOLTAGE-FREQUENCY CONVERSION CIRCUIT
Document Type and Number:
Japanese Patent JP3265783
Kind Code:
B2
Abstract:
PURPOSE: To control fluctuation of a frequency output small by compensating a delay or a lead of time of a comparator due to a change in temperature.
CONSTITUTION: An integrating circuit 1 constructed of an operational amplifier A1 of which an inverted input terminal and an output terminal are connected by a capacitor C1, a comparator circuit 2 constructed of a comparator Bl of an open collector output and turning a slant of an integrated output V2 normally or reversely by switching over charging on and discharging from the capacitor C1 by a comparison output V3, and a comparator circuit 3 constructed of a comparator B2 of the open collector output and comparing the integrated output V2 with a threshold voltage Vth with a prescribed hysteresis, are provided. A comparison output Vo of the comparator circuit 3 is made a comparison input of the comparator circuit 2 and a voltage signal V1 is made an integration input of the integrating circuit 1, while the comparison output of the comparator circuit 3 is obtained as a frequency signal Fo. A resistance circuit network R4 to R7 giving the hysteresis to the comparator circuit 3 is provided with a capacitor C2 of which the capacity becomes small with a rise in temperature.
Inventors:
Hirohisa Yamaguchi
Takao Ban
Takao Ban
Application Number:
JP34344793A
Publication Date:
March 18, 2002
Filing Date:
December 15, 1993
Export Citation:
Assignee:
株式会社デンソー
International Classes:
G01F1/68; G01D5/24; G01F1/696; G01F15/04; G01R19/165; G01R19/252; H03K7/06; (IPC1-7): G01R19/165; G01D5/24; G01F1/68; G01R19/252; H03K7/06
Domestic Patent References:
| JP6435218A | ||||
| JP6331373U |
Attorney, Agent or Firm:
Motoma Ito