A bandgap reference voltage circuit with high-order compensation and its adjustment method
A reference voltage and high-order compensation technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as poor bandgap reference voltage power supply rejection ratio and poor step consistency, and achieve temperature resolution effect, ensuring consistency, effect meeting application requirements
Active Publication Date: 2022-03-22
SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH
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Problems solved by technology
Although this method is simple to use, there are the following problems: First, the parallel connection of the NMOS switch and the resistor will introduce additional temperature effects, which will change greatly with the process; second, the equivalent resistance of the NMOS switch will change with the power supply voltage. The power supply rejection ratio of the bandgap reference voltage is not good; in addition, the step consistency of this way of trimming is not good
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[0030] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.
[0031] The invention discloses a bandgap reference voltage circuit with high-order compensation, please refer to image 3 , which includes a PMOS transistor MP1, a PMOS transistor MP2, a PMOS transistor MP3, a PMOS transistor MP4, an operational amplifier AMP, a PNP transistor Q1, a PNP transistor Q2, a PNP transistor Q3, a first tuning unit 1 and a second tuning unit 2, The source of the PMOS transistor MP1, the source of the PMOS transistor MP2, the source of the PMOS transistor MP3 and the source of the PMOS transistor MP4 are all connected to the power supply terminal DC, and the drain of the PMOS transistor MP1 connected to the emitter of the PNP transistor Q1, the base and the collector of the PNP transistor Q1 are grounded, the drain of the PMOS transistor MP2 is connected to the first terminal of the first tuning unit 1, the The second e...
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The invention discloses a bandgap reference voltage circuit with high-order compensation, wherein: the drain of PMOS transistor MP1 is connected to the emitter of PNP transistor Q1, the base and collector of PNP transistor Q1 are grounded, and the drain of PMOS transistor MP2 The drain is connected to the first end of the first trimming unit, the second end of the first trimming unit is connected to the emitter of the PNP transistor Q2, the base and collector of the PNP transistor Q2 are grounded, and the drain of the PMOS transistor MP3 Connected to the emitter of the PNP transistor Q3, the base and the collector of the PNP transistor Q3 are both grounded, the drain of the PMOS transistor MP4 is connected to the first end of the second tuning unit, and the second end of the second tuning unit is grounded, The non-inverting terminal of the operational amplifier AMP is connected to the first terminal of the first adjustment unit, the inverting terminal of the operational amplifier AMP is connected to the emitter of the PNP transistor Q1, the gate of the PMOS transistor MP1, the gate of the PMOS transistor MP2, the gate of the PMOS transistor The gate of MP3 and the gate of PMOS transistor MP4 are both connected to the output end of the operational amplifier AMP. The invention can ensure the consistency of the bandgap reference voltage and ensure that the bandgap reference voltage is not affected by temperature conditions.
Description
technical field [0001] The invention relates to a bandgap reference voltage circuit, in particular to a bandgap reference voltage circuit with high-order compensation and a repairing method thereof. Background technique [0002] The most classic voltage reference circuit in analog circuits is the bandgap reference voltage. The principle of the bandgap reference voltage is to use the base-emitter PN junction voltage V of the bipolar transistor (BJT) BE Negative temperature coefficient and ΔV BE The positive temperature coefficients cancel each other out to achieve a zero temperature coefficient reference voltage. Traditional bandgap reference voltage V BG Generally by V BE +k*ΔV BE Two parts, V BE The negative temperature coefficient is about -2mV / °C, while ΔV BE The positive temperature coefficient of is about 0.086mV / ℃, choose the appropriate k, it can be designed as a reference voltage independent of temperature. Conventional voltage reference circuits such as fig...
Claims
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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 田欢
Owner SHENZHEN BETTERLIFE ELECTRONICS SCI & TECH