A Full CMOS Reference Voltage Source with High Power Supply Rejection Ratio

Abstract

The invention discloses an all-CMOS (Complementary Metal Oxide Semiconductor) reference voltage source with a high power supply rejection ratio, which comprises a reference voltage source. The reference voltage source comprises a starting circuit, a current source circuit and a temperature compensating circuit, wherein an output end of the starting circuit is connected with an input end of the current source circuit; an output end of the current source circuit is connected with an input end of the temperature compensating circuit; an output end of the temperature compensating circuit forms an output end of the whole reference voltage source. The working characteristic of an MOS transistor working in a sub-threshold region is utilized by the all-CMOS reference voltage source, a nanoampere-magnitude reference current is generated; power supply noise is rejected by adopting a cascode current mirror. In addition, the all-CMOS reference voltage source not only has the advantages that the chip area is small and the power consumption is low and is only nanowatt-magnitude, but also has the advantages that the all-CMOS reference voltage source has the high power supply rejection ratio, the temperature drift coefficient is low, and the line-voltage regulation is low; moreover, a resistor, a diode and a triode are not used; the all-CMOS reference voltage source is compatible with a standard CMOS process; the layout area is effectively reduced; the production cost is decreased.

Description

technical field

[0001] The invention relates to the technical field of integrated circuits, in particular to a full CMOS reference voltage source with high power supply rejection ratio. Background technique

[0002] The reference voltage source is an important module in digital-analog hybrid circuits and analog hybrid circuits, and is often used in voltage management chips, digital-to-analog converters (DAC), analog-to-digital converters (ADC) and phase-locked loops (PLL), In circuits such as low-dropout linear regulators (LDOs), the voltage reference provides a DC reference voltage for the system. A high-precision, high-stability reference voltage source is a necessary unit for high-performance analog integrated circuits. In view of the advantages of low temperature coefficient, high power supply rejection ratio, and compatibility with standard CMOS processes, the CMOS reference voltage source circuit has been widely studied and applied. It provides a system that is affect...

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