NMOS drive output band-gap reference circuit

Abstract

The invention provides an NMOS drive output band-gap reference circuit. The NMOS drive output band-gap reference circuit comprises a starting circuit module for providing a bias voltage, an operational amplifier used for fixing node voltages at the two feedback input ends of a band-gap reference module and the band-gap reference module used for generating a reference voltage with the zero-temperature coefficient; the starting circuit module provides the bias voltage for the operational amplifier and the band-gap reference module. According to the NMOS drive output band-gap reference circuit, an NMOS serves as output of the band-gap reference voltage, and the band-gap reference drive capacity is improved; a PMOS is used for starting the current of the circuit in a mirroring mode, hundreds of nA of current flows through a band-gap reference zero-temperature coefficient generation circuit, the band-gap reference starting capacity is strengthened, and the circuit reliability is improved. Unit resistors are connected in parallel or in series to be equivalent to a resistor R0, so that the resistance matching performance is improved, and the band-gap reference accuracy is optimized; the resistors are connected between an NMOS drive pipe and a power source in series, so that the electrostatic protection capacity of the circuit is improved.

Description

technical field [0001] The invention relates to the field of large-scale analog integrated circuit design, in particular to a bandgap reference circuit suitable for a strong drive capability and a current starting mechanism. Background technique [0002] The reference voltage source is the cornerstone of CMOS integrated circuit design, providing reference voltage for most analog circuits in the chip, such as digital-to-analog conversion (D / A Convertor) circuit, analog-to-digital conversion (A / D Convertor) circuit, phase-locked loop, power supply Management modules and comparators, etc. [0003] The output voltage of an ideal reference voltage source does not vary with changes in temperature, process, supply voltage, and load. The way to realize the reference voltage includes Zener tube, thermal voltage reference source, VBE reference source and bandgap reference source. Among them, the bandgap reference voltage source is widely used because of its advantages of compatibili...

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an NMOS driven output bandgap reference circuit, which is used to solve the problem of large output load, large power consumption, and reliable voltage source of the bandgap reference circuit in the prior art. gender issues

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