A bandgap reference circuit

Abstract

The embodiment of the present application discloses a bandgap reference circuit, including a core circuit, a first compensation circuit and a second compensation circuit, the core circuit is used to generate a bandgap reference voltage, and the first compensation circuit is used to use a MOS transistor The temperature characteristics of the first compensation current is generated to first compensate the bandgap reference voltage, and the second compensation circuit is used to generate the second compensation current by using the characteristics of the difference between the BE junction voltages of the two bipolar transistors to the bandgap reference voltage. The second compensation is performed on the reference voltage of the bandgap, so that through the first compensation current and the second compensation current, the bandgap reference voltage can be compensated from different angles, thereby effectively compensating the high-order temperature coefficient in the bandgap reference voltage, so that after compensation, The bandgap reference voltage features high temperature range, low temperature coefficient, and high accuracy.

Description

technical field [0001] The present application relates to the technical field of microelectronics, in particular to a bandgap reference circuit. Background technique [0002] Bandgap Reference (BGR) is an important module of modern analog integrated circuits and digital-analog hybrid integrated circuits. It is generally used in the fields of digital-to-analog converters and analog-to-digital converters, mobile device power management systems, and radio frequency circuits. The performance characteristics of the bandgap reference circuit directly affect the performance of the entire circuit, which requires improving the performance characteristics of the bandgap reference circuit. [0003] refer to figure 1 As shown, it is a schematic diagram of a traditional bandgap reference circuit, including PMOS transistors M1, M2, M3, operational amplifier OP1, bipolar transistors Q1, Q2, resistors R0, R2, R3, R4. The bandgap reference circuit uses two A negative temperature coefficien...

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Problems solved by technology

[0010] In view of this, the embodiment of the present application provides a bandgap reference circuit, which can solve the problem that the voltage source generated by the traditional bandgap reference circuit in the prior art cannot meet the accuracy requirements of the system-level modules in modern analog integrated circuits, and provides a A Bandgap Reference Circuit with Wide Temperature Range and Low Temperature Coefficient

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