A bicmos no-op-amp bandgap voltage reference with temperature monitoring function

Abstract

The invention provides a BiCMOS non-operational amplifier band gap voltage reference source with a temperature monitoring function. The BiCMOS non-operational amplifier band gap voltage reference source comprises a reference generation module (10), a bias generation module (20) connected with the reference generation module (10), a temperature protection module (40) connected with the bias generation module (20), a starting circuit (30) connected with the temperature protection module (40), and a negative feedback clamping circuit (50) which is connected with the bias generation module (20), the starting circuit (30) and the temperature protection module (40) respectively. The reference generation module generates a reference voltage. The bias generation module generates a first bias voltage and assists the reference generation module to conduct voltage clamping. The temperature protection module outputs a temperature protection signal through the first bias voltage. The starting circuit generates an interference current through a starting enable signal which is generated by the temperature protection module, so that the circuit enters into a normal working state. The negative feedback clamping circuit is used for stabilizing the reference voltage and the first bias voltage.

Description

Technical field [0001] The invention relates to the technical field of power supplies, in particular to a BiCMOS operational amplifier bandgap voltage reference source with temperature monitoring function. Background technique [0002] Reference voltage source, as an essential unit circuit module in integrated circuits, provides reference voltage or reference bias current for the entire chip, and is widely used in analog or analog-digital hybrid integration such as switching power supplies, phase-locked loops, and data converters. In the circuit, for example, as a reference voltage in a comparator or error amplifier, the stability of the reference largely determines the realization of the system function and the performance. The band gap reference voltage source is called the most common circuit structure in the reference voltage source circuit due to its high power supply rejection ratio (PSRR), low temperature coefficient and low time drift. [0003] The basic principle of the b...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a BiCMOS non-op-amp bandgap voltage reference source with temperature monitoring function to solve the problem that the existing bandgap voltage reference source circuit includes operational amplifiers, power consumption and chip area of ​​operational amplifiers Relatively large, the application in some low-power consumption systems (such as the Boost module in the energy harvesting system) is limited, and the offset voltage and noise caused by the mismatch of the operational amplifier have a greater impact on the accuracy of the bandgap reference voltage source. And in the existing circuit system, it is generally necessary to design a temperature protection module separately, which increases the problem of chip area and power consumption

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