ldo pre-compensation circuit
A pre-compensation and circuit technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve the problems of small static current, low power supply suppression, low noise, etc., and achieve convenient frequency compensation, system stability, and power supply suppression Higher effect
Active Publication Date: 2020-10-27
宁波市芯能微电子科技有限公司 +3
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- Application Information
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Problems solved by technology
Low-dropout (LDO) linear regulators have low cost, low noise, and low quiescent current. These are its outstanding advantages. It requires few external components, usually only one or two bypass capacitors; but there is power supply suppression relatively low problem
Method used
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Embodiment
[0023] Embodiment: a kind of LDO pre-compensation circuit, such as figure 1 Shown: including multi-stage pre-compensation circuit, capacitor C and LDO chip;
[0024] The output terminal V of the multi-stage pre-compensation circuit out Connected to the capacitor C, the capacitor C is grounded; the output terminal V of the multi-stage pre-compensation circuit out It is also connected to the input terminal of the LDO chip, and the output terminal of the LDO chip is grounded;
[0025] The multi-stage pre-compensation circuit includes a first operational amplifier AMP 1 , the second operational amplifier AMP 2 , the first MOS tube M 1 , the second MOS tube M 2 , the third MOS tube M 3 , the first rheostat RP 1 , the second rheostat RP 2 , the third rheostat RP 3 , the first resistor R 1 and the second resistor R 2 , where: the first operational amplifier AMP 1 The non-inverting input terminal is connected to the input voltage V of the pre-compensation circuit OD ; The...
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The invention discloses an LD0 front end compensation circuit. The LD0 front end compensation circuit comprises a multi-stage front end compensation circuit, a capacitor and an LD0 chip; the output end Vout of the multi-stage front end compensation circuit is connected with the capacitor, and the capacitor is grounded; the output end Vout of the multi-stage front end compensation circuit is connected with the input end of the LD0 chip, and the output end of the LD0 chip is grounded. The multi-stage front end compensation circuit is adopted for compensation, and the multi-stage front end compensation circuit is designed and improved, so that the multi-stage front end compensation circuit has the characteristics of the stable system, convenience in frequency compensation and the high power supply rejection ratio, can be used for performing noise cancellation on the system at high frequency, and has a superior using effect.
Description
technical field [0001] The invention relates to a pre-compensation circuit, in particular to an LDO pre-compensation circuit. Background technique [0002] An LDO is a linear regulator that uses a transistor or field effect transistor (FET) operating in its linear region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. The so-called drop voltage refers to the minimum value of the difference between the input voltage and the output voltage required by the regulator to maintain the output voltage within 100mV of its rated value. LDO (Low Dropout) regulators for positive output voltages typically use power transistors (also known as pass devices) as PNPs. The transistors are allowed to saturate, so the regulator can have a very low dropout voltage, typically around 200mV; compared to around 2V for a traditional linear regulator using an NPN composite power transistor. The negative output LDO uses NPN as its transfer device, and ...
Claims
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IPC IPC(8): G05F1/625
CPCG05F1/625
Inventor 陈海虹张廉林浩孙化王志红冉承新邓小群吕德刚梁延峰林丰成王保峰杨海申钟才明杜世民张力
Owner 宁波市芯能微电子科技有限公司