Band-gap reference voltage source circuit and band-gap reference voltage source
A reference voltage source and circuit technology, applied in the direction of regulating electrical variables, instruments, control/regulating systems, etc., can solve the problems of waste of power loss materials, inability to meet, reduce circuit performance, etc., achieve low temperature drift characteristics, reduce temperature coefficient, Guaranteed effect of stability
Pending Publication Date: 2022-05-13
SHANDONG NORMAL UNIV
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Problems solved by technology
However, the traditional bandgap reference voltage source only performs first-order compensation on the temperature characteristic curve, which is difficult to meet the requirements of modern high-precision systems
[0004] In order to obtain a reference voltage source with high precision and low temperature drift, high-order compensation is required; moreover, passive resistance elements and bipolar junction transistors BJT are used in the traditional reference voltage source circuit structure, and this method greatly increases The integrated circuit area is reduced, and at the same time, an excessively large area causes more power loss and waste of materials, reducing circuit performance
Method used
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Embodiment 1
[0042] asFigure 1-2 As shown, the present embodiment provides a new type of low-power high-performance high-precision bandgap reference circuit applied to switching power supply circuit, comprising: a sequentially connected start circuit, a bias current source circuit, a low threshold source follow circuit, a bandgap reference core circuit, a curvature compensation circuit and a reference voltage output circuit;
[0043] wherein, the start circuit for starting the voltage reference after power-up;
[0044] The bias current source circuit for controlling the resistance of the field effect transistor operating in the linear region by the gate source voltage difference of the field effect transistor operating in the sub-threshold region, and obtaining the bias current according to the leakage source voltage and resistance of the field effect transistor operating in the linear region;
[0045] The low threshold source follows the circuit for receiving bias current to control the loop ...
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The invention discloses a band-gap reference voltage source circuit and a band-gap reference voltage source. The band-gap reference voltage source circuit comprises a starting circuit used for starting a reference voltage source; the bias current source circuit controls the resistance of the field effect transistor in the linear region through the gate-source voltage difference of the field effect transistor in the sub-threshold region, and obtains bias current according to the drain-source voltage and the resistance of the field effect transistor working in the linear region; the low-threshold source follower circuit controls the loop gain by controlling the output impedance of the operational amplifier; the band-gap reference core circuit obtains reference voltage according to the base-emitter voltage of the bipolar transistor at the negative temperature coefficient and the base-emitter voltage of the bipolar transistor at the positive temperature coefficient; the curvature compensation circuit generates a compensation current inversely proportional to the temperature coefficient so as to perform curvature compensation on the reference voltage. And the band-gap reference voltage source with low power consumption, high performance and high precision is obtained.
Description
Technical field [0001] The present invention relates to the technical field of switching power supply circuit design, in particular to a bandgap reference circuit and a bandgap reference. Background [0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art. [0003] With the development of current electronic circuit technology and Internet of Things systems, the application of reference voltage source circuits is becoming more and more extensive. The reference circuit is one of the important circuits of integrated circuits in the Internet of Things system, providing a stable current or voltage for the entire system. However, traditional bandgap references only compensate for the temperature characteristic curve in the first order, which is difficult to meet the requirements of modern high-precision systems. [0004] In order to obtain a high-precision and low-temperature dr...
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Login to View More IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 华庆王奔
Owner SHANDONG NORMAL UNIV