Sub-threshold band-gap reference voltage source based on substrate bias regulation and control

Abstract

The invention belongs to the technical field of analog integrated circuits, particularly relates to a sub-threshold band-gap reference voltage source based on substrate bias regulation and control, and aims to solve the problems that an existing low-voltage band-gap reference voltage source based on a sub-threshold technology is narrow in temperature range, and particularly is seriously limited ata low temperature. The sub-threshold band-gap reference voltage source comprises a sub-threshold current source, a PTAT generation circuit, a CTAT generation circuit, a feedback circuit and a power supply rejection ratio enhancement module, wherein a substrate of a PMOS tube forming the PTAT generation circuit is connected to a drain electrode of the PMOS tube such that substrate current generated by the PMOS tube is greatly reduced, a PTAT voltage solution can still be obtained according to the Kirchhoff current law at a low temperature, and the working temperature range of the reference voltage source is greatly expanded; meanwhile, the CTAT generation circuit composed of a diode D1 is adopted, it is guaranteed that CTAT voltage is not distorted at the low temperature, and the low-temperature adaptability of the reference voltage source is further guaranteed; and the power supply rejection ratio enhancement module composed of a capacitor Cc is adopted to effectively improve the power supply rejection ratio of the voltage source.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and relates to a bandgap reference voltage source structure, in particular to a subthreshold bandgap reference voltage source with low voltage and low power consumption based on substrate bias regulation and applied to a wide temperature range. Background technique [0002] Bandgap reference voltage sources are widely used in various integrated circuit modules such as AD / DA, LDO, PLL, etc., and play a basic but key role; with the popularity of extremely low-power integrated circuit design and process With the advancement of medical electronics, Internet of Things and other fields, low-power reference voltage sources working at low voltages are required as a strong support for circuits. [0003] At present, the most widely used is the subthreshold-based bandgap reference voltage source technology, which uses the characteristics of MOSFET with extremely low drain-source current i...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a subthreshold bandgap reference based on substrate bias regulation for the problem that the existing low-voltage bandgap reference voltage source based on subthreshold technology has a narrow temperature range, especially at low temperatures. Voltage source, which not only meets the basic requirements of low voltage and low power consumption under the sub-threshold, but also can work effectively in a wide temperature range

Images