Low power consumption reference voltage source circuit for 4g communication chip

Abstract

The invention belongs to the technical field of integrated circuits and relates to a low-power-consumption reference voltage source circuit for a 4G (4th Generation) communications chip. The circuit comprises a self-biased voltage reference source circuit, which consists of enhancement-mode tubes and depletion-mode tubes, and a start circuit and is characterized in that the voltage of an output terminal VREF is independent of power supply voltage VDD and does not change along with the change of the VDD; by using the characteristic that the threshold of the enhancement-mode tubes and the threshold of the depletion-mode tubes have opposite temperatures, the voltage of the VREF does not change along with temperature; by using the characteristic that the on-resistance of depletion-mode NMOS (N-Channel Metal Oxide Semiconductor) tubes short-circuited with gate-source is extremely high, the working current of the circuit is very low and has low static power consumption. Thus, due to the adoption of a depletion-mode MOS (Metal Oxide Semiconductor) tube and enhancement-mode MOS tube combined manner, the high-precision low-power-consumption reference voltage source circuit which does not change along with the power supply voltage and temperature is generated.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and relates to a low-power reference voltage source circuit for 4G communication chips, which is suitable for being embedded in various chips that require high-precision reference voltage sources, and is especially suitable for applications that require extremely high power consumption. All kinds of mobile devices, such as mobile phones, laptops, etc. Background technique [0002] As we all know, in all the schemes involving analog circuit design, there will be a reference voltage source circuit that provides a stable voltage source that does not change with the power supply voltage and temperature for other modules in the chip. At present, the general sampling reference voltage source is a bandgap reference voltage source (Bandgap) structure, but the power consumption is often relatively large, about dozens of uA, which is difficult to meet the requirements of low power consumption...

AI Technical Summary

Problems solved by technology

[0008] 1. The bandgap reference voltage source contains an operational amplifier, and the power consumption of this structure is generally tens of uA, which cannot achieve low power consumption;

[0009] 2. The op amps in the bandgap reference along with the transistors and high value resistors take up a lot of area, preventing a highly integrated low cost solution

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