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Title:
HIGH IMPEDANCE INPUT DEVICE
Document Type and Number:
Japanese Patent JPS6451810
Kind Code:
A
Abstract:

PURPOSE: To obtain a stable output current by connecting two input terminals to both inputs of a differential amplifier.

CONSTITUTION: Resistors 2∼4 are connected in series from a reference voltage VREF in an input circuit section 1 and a cord 3 for remote control is connected across the resistor 3. Resistors 6, 7 are connected to the two input terminals of the differential amplifier 8 and the output of the differential amplifier 8 is connected to the input/output terminal of a current mirror circuit 9 and an output V0 is provided on the output side of the current mirror circuit 9 to obtain an output current I0. When the cord 5 is approached, the input minute change is equal and in phase and the difference is always equal. Thus, the output current is always constant and changes in response to the change in the resistor 3 and a constant output current is obtained without being affected by an external static effect.


Inventors:
NAGAHISA TETSURO
TANAKA YUJI
IMAI HIDETOSHI
Application Number:
JP20967987A
Publication Date:
February 28, 1989
Filing Date:
August 24, 1987
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H03G1/02; H03G3/10; (IPC1-7): H03G1/02; H03G3/10
Attorney, Agent or Firm:
Akira Kobiji (2 outside)



 
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