transient enhanced ldo circuit
A transient, circuit technology used in electronics to solve problems such as system performance degradation
Active Publication Date: 2020-08-07
SHANGHAI BEILING
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a transient enhanced LDO circuit in order to overcome the defect that the system performance of the low dropout linear regulator circuit is significantly reduced when the load jumps rapidly in the prior art
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[0031] The present invention will be further described below by means of preferred embodiments, but the present invention is not limited to the scope of the described embodiments.
[0032] A transient enhanced LDO circuit such as figure 1 As shown, the LDO circuit includes an error amplifier EA1, a transient enhanced feedforward circuit, a common source amplifier, a first PMOS transistor P1, a first resistor R1, a second resistor R2, a capacitor CL and a load RL;
[0033] The first input terminal of the error amplifier EA1 is connected to the reference voltage vref, the first output terminal of the error amplifier EA1 is respectively connected to the input terminal of the common source amplifier and the input terminal of the transient enhancement feedforward circuit, the The second output terminal of the error amplifier EA1 is connected to the power supply vdd;
[0034] The source of the first PMOS transistor P1 is connected to the power supply vdd, the drain of the first PMO...
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The invention discloses a transient enhanced LDO circuit, which comprises an error amplifier, a transient enhanced feedforward circuit, a common source amplifier, a first PMOS tube, a first resistor,a second resistor, a capacitor and a load. The first input end of the error amplifier is connected with a reference voltage, the first output end of the error amplifier is respectively connected withthe input end of the common source amplifier and the input end of the transient enhanced feedforward circuit, and the second output end of the error amplifier is connected with a power supply; the source electrode of the first PMOS tube is connected with the power supply, the drain electrode of the first PMOS tube is respectively connected with the output end of the common source amplifier and theoutput end of the transient enhanced feedforward circuit, and the grid electrode of the first PMOS tube is respectively connected with one end of the first resistor, one end of the capacitor and oneend of the load; one end of the second resistor is respectively connected with the other end of the first resistor and the second input end of the error amplifier, and the other end of the second resistor, the other end of the capacitor and the other end of the load are respectively grounded. According to the invention, when the load rapidly jumps from a light load to a heavy load, a pull-down current is generated by the transient enhanced feedforward circuit, and the voltage output to the load is increased.
Description
technical field [0001] The invention belongs to the field of electronic technology, in particular to a transient enhanced LDO circuit. Background technique [0002] The LDO circuit (Low Dropout Linear Regulator Circuit) is a negative feedback system that outputs a stable vout voltage by comparing the reference voltages vref and vfb. In the LDO structure, when the load quickly jumps from light load to heavy load state, through the feedback of the entire negative feedback circuit, the vout is pulled high, so that the system re-enters the steady state. However, due to the large parasitic capacitance of the driving tube in the LDO circuit, and the bias current of the second-stage NMOS tube is limited , resulting in a limited rate of change of the gate voltage VGS of the drive tube, and at the same time limited by the bandwidth of the entire negative feedback loop, so that when the load jumps rapidly, the instantaneous fluctuation of vout is large, and the system performance is s...
Claims
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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 常祥岭谢雪松赵海亮刘燕涛龙继志
Owner SHANGHAI BEILING