US 2013/0154753 A1Published application

Oscillation circuit and oscillation system

AssigneeIPGoal Microelectronics (SiChuan) Co., Ltd.

InventorJunwei Huang

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Abstract

An oscillation circuit includes a threshold voltage extraction module, a positive temperature coefficient voltage generation module, an addition module, a common-source amplifier module, a charge and discharge module, and a clock output terminal. The common-source amplifier module includes a first field effect transistor (FET) and a second FET. The addition module includes a first operational amplifier, a second operational amplifier, a third FET, a fourth FET, a fifth FET, a sixth FET, a first resistor, a second resistor, and a third resistor. The charge and discharge module includes a seventh FET, an eighth FET, a charge and discharge FET, a first switch, a second switch, a first comparator, a second comparator, a first nor gate and a second nor gate. An oscillation system is further provided. The oscillation circuit and the oscillation system of the present invention have simple structures and are easy to implement.

Claims10

Dependent claims

An oscillation circuit, comprising:

a threshold voltage extraction module, a positive temperature coefficient voltage generation circuit, an addition module connected with said threshold voltage extraction module and said positive temperature coefficient voltage generation circuit, a common-source amplifier module connected with said addition module, a charge and discharge module connected with said common-source amplifier module, and a clock output module connected with said charge and discharge module, wherein said common-source amplifier module comprises a first field effect transistor (FET), and a second FET connected with said first FET, said addition module comprises a first operational amplifier connected with said threshold voltage extraction module, a second operational amplifier connected with said positive temperature coefficient voltage generation module, a third FET connected with said first operational amplifier, a fourth FET connected with said first operational amplifier, a fifth FET connected with said second operational amplifier, a sixth FET connected with said second operational amplifier, a first resistor connected with said third FET, a second resistor connected with said fifth FET, and a third resistor connected with said sixth FET, said charge and discharge module comprises a seventh FET connected with said first FET, an eighth FET connected with said second FET, a charge and discharge FET for charging and discharging, a first switch connected between said seventh FET and said charge and discharge FET, a second FET connected between said seventh FET and said eighth FET, a first comparator connected with said first switch, a second comparator connected with said first comparator, a first nor gate connected with said first comparator, and a second nor gate connected with said second comparator.

An oscillation system, comprising a threshold voltage extraction module for extracting a voltage related to a threshold voltage, a positive temperature coefficient voltage generation circuit for generating a positive voltage, an addition module connected with said threshold voltage extraction module and said positive temperature coefficient voltage generation module, a common-source amplifier module connected with said addition module for generating a current which is independent of a temperature and related to a gate oxide capacitor, a charge and discharge module connected with said common-source amplifier module for charging and discharging a charge and discharge capacitor, and a clock output module connected with said charge and discharge module, wherein said common-source amplifier module comprises a first FET, and a second FET connected with said first FET.

Dependencies are inferred from the claim text.

Facts

Application: 13/494,970Filed 12 Jun 2012
Priority: CN 201110336732.431 Oct 2011
Published: 20 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H03L 1/02
Stabilisation of generator output against variations of physical values, e.g. power supply: against variations of temperature only
H03K 3/011
Details: modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
H03K 3/0231
By the use of differential amplifiers or comparators, with internal or external positive feedback: astable circuits
H03L
Automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or

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US 8,729,969 B2Related patent
US 2013/0154753 A1This patent

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