Novel transient response enhanced LDO

A transient response, a new type of technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problem of difficult further improvement of transient response, and achieve the goal of improving anti-noise performance, enhancing transient response, and eliminating burrs Effect

Pending Publication Date: 2021-04-30
BRITE SEMICON SHANGHAI CORP
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  • Abstract
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  • Claims
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Problems solved by technology

However, increasing the bandwidth will also increase the power consumption. In the case of limited power consumption, the bandwidth is limited, and the

Method used

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  • Novel transient response enhanced LDO
  • Novel transient response enhanced LDO
  • Novel transient response enhanced LDO

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Embodiment Construction

[0012] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, those skilled in the art All other embodiments obtained by the skilled person without creative work belong to the protection scope of the present invention.

[0013] The present invention provides a novel transient response enhanced LDO, the overall circuit structure of which is as follows figure 2 As shown, it mainly includes the error amplifier EA, the adjustment tube MP, the feedback resistor network RA and RB, the feedback capacitor CA, the load capacitor CL and the load resistor Rout. State response of the transient response enhancement circuit TRANSIENT ENHANGCE.

[0014] The error amplifier EA includes M1-M10, wherein the substrates of M1-M4 and the sources of M1-M3 are connected to the...

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Abstract

The invention provides a novel transient response enhanced LDO. The novel transient response enhanced LDO comprises an error amplifier EA, an adjusting tube MP, feedback resistor networks RA and RB, a feedback capacitor CA, a load capacitor CL and a load resistor Rout. A transient response enhancement circuit TRANSIENT ENHANGCE is connected between the error amplifier EA and the grid electrode of the adjusting tube MP, and the TRANSIENT ENHANGCE comprises a hysteresis comparator, an ONE_SHOT and two NMOS tubes MN1 and MN2. The hysteresis comparator is used for collecting and comparing the drain voltage of the input differential pair transistor of the error amplifier EA, burrs of the obtained comparison result are eliminated through the ONESHOT, and the anti-noise performance of transient enhancement is improved. And the grid voltage of the adjusting tube MP is adjusted through the NMOS tube, so that the effect of enhancing the transient response of the load is achieved.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a novel transient response enhanced LDO. Background technique [0002] LDO is a DC step-down linear regulator, which can maintain a stable output voltage even when the input voltage or load current changes. Traditional LDO structures such as figure 1 As shown, its working principle is: VOUT=(R1+R2) / R2*VREF, when the load changes, for example, the load current increases, VOUT decreases, then VFB decreases, and VEA decreases through the error amplifier EA, thereby adjusting Adjust the tube MPASS to increase the current and increase the VOUT voltage. Through this negative feedback loop, the VOUT voltage is finally restored. The load transient response of a conventional LDO is adjusted through a negative feedback loop, and the larger the bandwidth of the LDO, the better the transient response. However, increasing the bandwidth will also increase the power consumption. In the case of ...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 倪灿灿
Owner BRITE SEMICON SHANGHAI CORP
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