Title:
SEMICONDUCTOR INTERGRATED CIRCUIT
Document Type and Number:
Japanese Patent JPS5943421
Kind Code:
A
Abstract:
PURPOSE:To prevent the influence of power variation entailing the operation of a logical circuit, etc., upon an oscillation circuit, by separating a supply system for clamp voltages supplied from a constant voltage circuit to the oscillation circuit, logical circuit, etc., into the oscillation circuit and other circuits. CONSTITUTION:The constant voltage circuit 1 connected to a battery power source B such as a lithium battery supplies clamp voltages V1 and V2 to the oscillation circuit 2 and other circuits, i.e. dividing circuit 3, logical circuit 4, etc., separately through power source lines l1 and l2 formed individually. The clamp voltage V2 of the power source line l2, is not inputted to an input terminal of an operational amplifier 1a and only the clamp voltage V1 of the power source line l1 to the oscillation circuit 2 having relatively less voltage variation is inputted thereto. Therefore, even if the voltage V2 of the power source line l2 varies owing to a transient current during the operation of the logical circuit 4, the output voltage of the operation amplifier 4 never varies.
Inventors:
HONGOU TOYOHIKO
Application Number:
JP15390682A
Publication Date:
March 10, 1984
Filing Date:
September 06, 1982
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G04G3/00; G05F1/56; G05F1/577; H01L21/822; H01L27/04; (IPC1-7): G04G3/00; G05F1/56; H01L27/04
Domestic Patent References:
| JP51082935B |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)
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