Oscillation circuit and method of controlling same

A technology of oscillating circuits and circuits, applied in power oscillators, electrical components, generating electric pulses, etc., can solve problems such as inability to form oscillating circuits, and achieve the effects of shortening start-up time and suppressing current consumption
CN101714863AInactive Publication Date: 2010-05-26NEC ELECTRONICS CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
NEC ELECTRONICS CORP
Publication Date
2010-05-26
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

Disclosed is an oscillator in which current consumption relating to oscillation is reduced. The oscillator comprises: an amplifier to an input and output of which a piezoelectric oscillator and a feedback resistor are connected in parallel, and which is constituted by a CMOS logic inverter circuit; and a control circuit, which is constituted by a CMOS logic circuit, for clamping input / output levels of the amplifier and halting oscillation before oscillation start-up, unclamping the input / output levels at beginning of oscillation start-up and supplying a pulse signal to an output terminal of the amplifier a prescribed period of time after the beginning of oscillation start-up.
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Description

technical field

[0001] The invention relates to an oscillating circuit and a control method thereof, in particular to an oscillating circuit composed of a CMOS circuit and a control method thereof. Background technique

[0002] In an oscillation circuit used as a reference clock generation source, a circuit in which a piezoelectric oscillator such as a crystal oscillator and a feedback resistance element are connected in parallel between the input and output of a CMOS inverter is widely used. Patent Document 1 discloses a technique for suppressing useless current consumption when oscillation stops in such an oscillation circuit. The oscillating circuit of Patent Document 1 is provided with a control circuit in which a feedback resistor is constituted by a MOS transistor, and a series circuit formed by connecting a second feedback resistor having a lower resistance value than the MOS transistor in series and a capacitive element is connected to the above-mentioned The MOS tr...

Claims

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