Title:
FREQUENCY/VOLTAGE CONVERSION CIRCUIT
Document Type and Number:
Japanese Patent JP3302032
Kind Code:
B2
Abstract:
PURPOSE: To eliminate the generation of an output voltage so that the influence of an offset voltages is always unmagnified even when an input frequency is 0Hz.
CONSTITUTION: This frequency voltage is conversion circuit is provided with inverters 1 connected in plural stages while receiving a reference voltage as a power supply voltage and being activated with an input frequency signal, a current/voltage conversion circuit 4 converting a current resulting from differentiating the output of the inverter of the final stage with a capacitor 2 into a voltage, an analog switch 5 receiving the output of the inverter being the inverse of the output of the final stage inverter as a gate signal to discharge the charge stored by the differentiation operation of the capacitor 2 and an analog switch 3 turning off the connection between the differentiation capacitor 2 and the current voltage conversion circuit 4 while receiving the output of the inverter whose logic value is the same logic value of the output of the final stage inverter as a gate signal when the charge of the differentiation capacitor 2 is discharged through the turning-on of the analog switch 5.
Inventors:
Chiaki Okamura
Akira Taniguchi
Akira Taniguchi
Application Number:
JP23641091A
Publication Date:
July 15, 2002
Filing Date:
September 17, 1991
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H03K9/06; G01R23/00; (IPC1-7): H03K9/06; G01R23/00
Attorney, Agent or Firm:
Takehiko Suzue
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