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Title:
POWER SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JPH04291608
Kind Code:
A
Abstract:
PURPOSE:To improve the follow-up properly of voltage impressed to an internal circuit to instantaneous variation (noise) without increasing the idling current of a variable resistance element drive. CONSTITUTION:This power supply circuit provided with a variable resistance element 500 inserted into a feed line to the internal circuit 100 to be a load to change a resistance value in accordance with a signal N1 applied to its control input terminal, a reference voltage generating source 200 for generating a reference voltage N3 to be the reference of voltage to be impressed to the circuit 100, a voltage comparator 300 for comparing the reference voltage N3 with an impressing voltage VDD practically impressed to the circuit 100, and the resistance element drive 400 for driving the element 500 in accordance with the output signal N2 of the comparator 300 and holding the impressing voltage VDD to the circuit 100 at a fixed level is constituted so that the voltage VDD practically impressed to the circuit 100 is negatively fed back through the control input terminal of the element 500 and a capacitor C1.

Inventors:
KOYOU KAZUTO
Application Number:
JP5721891A
Publication Date:
October 15, 1992
Filing Date:
March 20, 1991
Export Citation:
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Assignee:
FUJITSU LTD
International Classes:
G05F1/56; G05F1/63; G05F3/24; G11C5/14; G11C11/407; H01L27/02; H03K17/14; H03K17/16; (IPC1-7): G05F1/56
Attorney, Agent or Firm:
Yasuo Ishikawa



 
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