Non-resistance type reference source

Abstract

The invention discloses a non-resistance type reference source, and belongs to the technical field of power supply management. The non-resistance type reference source comprises a starting circuit, a reference voltage generation circuit and a bias current generation circuit, wherein when a power supply is constructed, the starting circuit makes the reference source disengaged from a zero state and then retreats after starting is completed; a PMOS pipe with large threshold voltage negative temperature coefficient and an NMOS pipe with small negative temperature coefficient are selected, the negative temperature voltage in reference voltage is obtained through the threshold voltage difference of the PMOS pipe and the NMOS pipe, the positive temperature voltage is determined according to the thermal voltage, the sub-threshold slope factor and the related width-to-length ratio of the MOS pipe, and then the reference voltage VREF with good temperature characteristics can be obtained; bias currents with positive temperature characteristics are generated through the NMOS pope working in a sub-region, and the positive temperature characteristics of the currents can be enhanced when temperature rises. On the basis of traditional threshold reference, reference circuit branches are reduced, so power consumption of a reference circuit is reduced, and the power supply rejection ratio of the reference voltage is increased.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to the design of a non-resistance reference source circuit, which has the characteristics of low voltage, low power consumption and high power supply rejection ratio PSRR. Background technique [0002] As the core module of the electronic system, the reference source is in many circuits such as analog-to-digital converter (ADC), digital-to-analog converter (DAC), linear regulator, switching regulator, temperature sensor, rechargeable battery protection chip and communication circuit. An indispensable part, providing an accurate and stable reference signal source for the circuit. As electronic systems, especially battery-powered or self-powered systems, such as environmental sensor networks, energy harvesting systems, bioelectronic systems, etc., have increasingly urgent requirements for low voltage and low power consumption, reduce the power consumption o...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the common problems of high power consumption and low power supply rejection ratio in the reference sources in the prior art, the present invention proposes a non-resistive reference source, and the ultra-low power consumption sub-threshold reference source based on the sub-threshold MOSFET has a nanowatt capacity Level power consumption and wide frequency range high power supply rejection ratio PSRR characteristics

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