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Band gap reference voltage source and electronic equipment

A reference voltage source and resistance technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of large compensation capacitor area and difficulty in loop compensation, so as to improve the loop bandwidth, increase the unit increase and decrease The effect of loop compensation difficulty

Pending Publication Date: 2019-02-26
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology

It can be seen that the position of the secondary pole of this traditional bandgap reference voltage source structure is at a lower frequency, the loop compensation is more difficult, the unity gain bandwidth (Gain–Band Width, GBW) is lower, and the required compensation capacitor area is smaller. Big

Method used

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  • Band gap reference voltage source and electronic equipment
  • Band gap reference voltage source and electronic equipment
  • Band gap reference voltage source and electronic equipment

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Embodiment Construction

[0040] As described in the background art, the position of the secondary pole of the bandgap reference voltage source structure in the prior art is at a lower frequency, the loop compensation is more difficult, and the unity gain bandwidth (Gain–Band Width, GBW) is low, and the required compensation The capacitor area is larger. The specific reasons are described below.

[0041] refer to figure 1 , figure 1 It is a schematic diagram of a circuit structure of a bandgap reference voltage source in the prior art, and the bandgap reference voltage source is composed of a first transistor M1, a second transistor M2, a third transistor M3, an operational amplifier OP, a first capacitor C1, and a second capacitor C2, the fourth transistor Q1, the fifth transistor Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5, the specific connection relationship refers to figure 1 ; Wherein, the first transistor M1, the s...

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Abstract

The invention discloses a band gap reference voltage source and electronic equipment. The band gap reference voltage source consists of a starting module and a band gap core module; when the band gapreference voltage source compensates for a loop, if a secondary pole of the band gap reference voltage source is equal to a zero point, the second capacitance value required for achieving a stable condition is far smaller than compensation capacitance required by a band gap reference voltage source in the prior art, and obviously, a main pole of the provided band gap reference voltage source is far greater than that of the band gap reference voltage source in the prior art. Therefore, the provided band gap reference voltage source can effectively increase loop bandwidth and achieve the purposes of reducing the loop compensation difficulty of the band gap reference voltage source, increasing unit gain bandwidth and reducing the required compensation capacitance.

Description

technical field [0001] The present application relates to the technical field of integrated circuits, and more specifically, to a bandgap reference voltage source and electronic equipment. Background technique [0002] As an indispensable basic module in integrated circuits, reference voltage sources are widely used in amplifiers, analog-to-digital converters, digital-to-analog converters, radio frequency, sensors and power management chips. Reference voltage sources include voltage references based on Zener diode reverse breakdown characteristics, voltage references based on PN junction forward conduction characteristics, and bandgap references. Among them, the bandgap reference has high precision, low temperature drift and high power supply Suppression ratio and other advantages, has been widely used. [0003] The bandgap reference voltage source in the prior art can obtain a bandgap reference voltage source with zero temperature coefficient by adjusting circuit parameter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 董渊王云松程剑涛
Owner SHANGHAI AWINIC TECH CO LTD
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