reference voltage generator

Abstract

A reference voltage generator includes a voltage generation circuit, an amplifier, a diode unit and a transistor. The voltage generation circuit includes an output terminal for outputting a reference voltage, a first terminal having an operational voltage, and a second terminal. The amplifier includes an input terminal coupled to the first terminal of the voltage generation circuit, an output terminal, a first terminal coupled to a first voltage terminal, and a second terminal. The diode unit includes a first terminal coupled to the second terminal of the amplifier, and a second terminal coupled to the second terminal of the voltage generation circuit and a second voltage terminal. The transistor includes a first terminal coupled to the first terminal of the amplifier, a second terminal coupled to the output terminal of the voltage generation circuit, and a control terminal coupled to the output terminal of the amplifier.

Description

technical field [0001] The present invention relates to a reference voltage generator, in particular to a reference voltage generator that can provide a constant voltage substantially independent of temperature. Background technique [0002] There is often a need for a reference voltage supply in the circuit application field, and a common solution may be, for example, to use a reference voltage generating circuit such as a bandgap voltage generator to provide the reference voltage. However, in the reference voltage generating circuit in the prior art, the control voltage must be as low as 1.2 volts, and then an operational amplifier (operational amplifier) ​​is used to amplify the 1.2 volts to obtain a reference voltage of 3.3 volts. This architecture requires the use of operational amplifiers, and the compensation capacitors included in the operational amplifiers make it difficult to reduce the circuit area. In addition, the reference voltage generation circuit in the pri...

AI Technical Summary

Problems solved by technology

This architecture requires the use of operational amplifiers, and the compensation capacitors included in the operational amplifiers will not easily reduce the circuit area

In addition, the reference voltage generation circuit in the prior art often has a situation where it is difficult to improve the power supply rejection ratio (PSRR), in other words, the reference voltage provided by it is easily affected by the noise of the power supply

The reference voltage generating circuit in the prior art also has process limitations, for example, it is difficult to manufacture using GaAs Heterojunction Bipolar Transistor (HBT) process

For example, the reference voltage generation circuit in the prior art often includes a current source composed of P-type metal oxide semiconductor transistors and a circuit composed of N-type metal oxide semiconductor transistors, so it is not easy to use gallium arsenide technology to manufacture

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