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CMOS reference source

A reference source and reference technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as chip performance impact

Inactive Publication Date: 2008-12-10
中科威发半导体(苏州)有限公司
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  • Claims
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Problems solved by technology

This error will have a greater impact on the performance of the entire chip in some chips with higher requirements.

Method used

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Embodiment Construction

[0019] A CMOS reference source, comprising a constant transconductance current source circuit 1 for outputting a constant transconductance current and having an off-chip resistance, a constant voltage reference generation circuit 2 for outputting a reference voltage, and a constant voltage reference generating circuit for outputting A constant current value current source circuit 3 for a constant current value.

[0020] The constant voltage reference generation circuit 2 is pressurized to the adjustable resistance array to obtain the output current of the constant current value current source circuit 3; the output current of the constant current value current source circuit 3 is passed through the resistance to obtain a comparison voltage; The pin 11 is respectively connected to the constant transconductance value current source circuit 1 and the constant current value current source circuit 3 to form two parallel branches; the constant voltage reference generation circuit 2 al...

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Abstract

The present invention relates to a CMOS reference source, which comprises a constant transconductance value current source circuit used to output constant transconductance value current, a constant voltage reference-producing circuit used to output a reference voltage and a constant current value current source circuit used to output a constant current value, a comparison voltage is obtained through resistors, and the constant voltage reference-producing circuit applies a voltage to an adjustable resistance array, so that the output current of the constant current value current source circuit can be generated; an off-chip resistor is needed, and the pin of the off-chip resistor is respectively connected with the constant transconductance value current source circuit and the constant current value current source circuit, and therefore a switching parallel circuit is formed; a feedback rectification system, which is composed of the resistor, a comparator and a digital control module, is used to rectify the output current value of the constant current value current source circuit. The present invention provides each core module unit circuit in an integrated CMOS circuit with the stable and high-precision CMOS reference source (a constant transconductance value current source and a constant current value current source) which cannot be affected by temperature change, power supply voltage change and the deviation of a fabrication technique.

Description

technical field [0001] The invention relates to a CMOS reference source, in particular, the invention relates to a CMOS reference source which is stable with changes in temperature, power supply voltage and process. Background technique [0002] The reference voltage and current source are very important unit module circuits in CMOS integrated circuits, which provide the necessary bias voltage and bias current for other unit modules in the chip, so its performance also greatly affects the entire chip performance. [0003] The design of the CMOS reference voltage source is basically based on the bandgap reference source (band gap) technology. A voltage reference source with an extremely low temperature coefficient (less than 8ppm) can be obtained by using the bandgap structure; and generally, when the power supply voltage varies by 10%, the obtained voltage reference is basically not affected. At the same time, using the method that the voltage reference is related to the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 贾海珑石寅
Owner 中科威发半导体(苏州)有限公司
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