Reference voltage and reference current generating circuit and method

Abstract

The invention relates to a reference voltage and reference current generating circuit and method. The reference voltage and reference current generating circuit comprises a bandgap reference circuit and a voltage-to-current conversion circuit. Through configuration, the bandgap reference circuit is used for generating the reference voltage with the zero temperature coefficient through generating first current with the positive temperature coefficient. The voltage-to-current conversion circuit is coupled to a node of the bandgap reference circuit, and the voltage of the node with the negative temperature coefficient is converted into second current with the negative temperature coefficient through configuration. The bandgap reference circuit and the voltage-to-current conversion circuit comprise a shared current source which is provided with a feedback transistor and circulates reference current. The reference current is divided into the first current in the bandgap reference circuit and the second current in the voltage-to-current conversion circuit, so the temperature coefficient substantially equal to zero is realized through converging the first current with the second current.

Description

technical field [0001] The present invention relates to a reference voltage and reference current generation circuit and method, and more particularly to a temperature-independent reference voltage and reference current generation circuit and method. Background technique [0002] It is often necessary to use a temperature-independent reference voltage and / or a temperature-independent reference current in integrated circuit design, and these reference voltages and reference currents are generally generated using a band-gap reference circuit. [0003] For example, in order to generate a reference voltage that has nothing to do with temperature (that is, zero temperature coefficient), it is often to use the negative temperature coefficient characteristic of the bipolar transistor to generate a negative temperature coefficient voltage, and use the conversion characteristic of the resistor to convert a The positive temperature coefficient current is converted into a positive temp...

AI Technical Summary

Problems solved by technology

[0005] However, traditional circuits often consume a lot of components, occupy a huge chip area, and cause a lot of power consumption and manufacturing costs

One of the reasons is that the generation of reference voltage and reference current is not integrated in the concept of circuit design.

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