Title:
CONSTANT VOLTAGE OUTPUT CIRCUIT
Document Type and Number:
Japanese Patent JPH08129425
Kind Code:
A
Abstract:
PURPOSE: To provide a constant voltage output circuit which is of a voltage follower constitution using an operational amplifier and can input and output a voltage larger than the in-phase input voltage range of the operational amplifier.
CONSTITUTION: The input voltage 10 is reduced by level shift by (2×VBE) by the NPN transistors TR 1 and 2 of the Darlington constitution, and the reduced voltage 10 is inputted to an operational amplifier 4. The output 12 of the amplifier 4 is increased by level shift by (2×VBE) by the PNP TR 7 and 8 of the Darlington constitution. Thus, the in-phase input voltage range of the amplifier 4 is apparently increased by (2×VBE).
Inventors:
ARATA KATSUTOSHI
Application Number:
JP26593194A
Publication Date:
May 21, 1996
Filing Date:
October 31, 1994
Export Citation:
Assignee:
NIPPON ELECTRIC ENG
International Classes:
G05F1/10; G05F1/56; (IPC1-7): G05F1/56; G05F1/10
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)