Title:
VOLTAGE CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JPS5582319
Kind Code:
A
Abstract:
PURPOSE:To extend the control range of a power source voltage by providing a boosting circuit in a circuit which measures two periods of an oscillator, which has an oscillation frequency comparatively stable for environments, and an oscillator, which has an oscillation frequency comparatively unstable for environments, to control the power source voltage. CONSTITUTION:Voltage control circuit 100 is constituted by charge pump circuit 18, capacity 17, transistor Tr16 and boosting circuit 50, and the supply voltage to circuit block 5 which is operated with a low voltage in circuits of a small-size electronic device is controlled by power source 7. A voltage is applied from power source 7 to high-potential side VDD of block 5 directly, and low-potential side VSS1 is connected to low-potential side VSS2 of power source 7 and circuit 18 through Tr16. Means 15 to measure the period relation between an oscillator, whose oscillation frequency is stable for environments, and an oscilator, whose oscillation frequency is comparatively unstable for them, is provided in block 5, and capacity 17 is charged by signals from means 15 to circuit 18 to control the gate of Tr16. Circuit 50 supplies potential VSS3 lower than potential VSS2 to circuit 18, and the gate of Tr16 is controlled by high potential VDD and low potential VSS3 to control the voltage of block 5.
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Inventors:
HASHIMOTO YUKIO
Application Number:
JP15615578A
Publication Date:
June 21, 1980
Filing Date:
December 15, 1978
Export Citation:
Assignee:
CITIZEN WATCH CO LTD
International Classes:
G05F1/56; G04C10/00; (IPC1-7): G04C10/00; G05F1/56