Dynamic zero miller compensation linear voltage regulator circuit based on zero adjusting resistor

Abstract

The invention discloses a dynamic zero miller compensation linear voltage regulator circuit based on a zero adjusting resistor. A PMOS (positive channel metal oxide semiconductor) working in a linear area serves as the zero adjusting resistor, the resistance value of the zero adjusting resistor varies with output current, so that zero led in through the zero adjusting resistor and a second pole of a feedback loop to cancel each other under the condition of different loads, and the stability of the feedback loop is guaranteed, and the bandwidth of the feedback loop is enlarged.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a linear voltage adjustment circuit. Background technique [0002] With the diversification of people's applications and the development of integrated circuit technology, the power supply voltage of different integrated circuits varies greatly, which requires a special circuit to convert the voltage of the power supply (such as lithium batteries, storage batteries, etc.) into a suitable power supply voltage . At the same time, the voltage of the power supply also varies greatly with time, temperature and other external factors, and a special circuit is required to maintain the stability of the integrated circuit power supply voltage. These functions can be realized by linear voltage regulation circuit. [0003] Linear voltage regulation circuits rely on a feedback loop to achieve a constant output voltage. However, due to the existence of the feedback loop, in order to mai...

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Problems solved by technology

But there are two problems that make ω zero =α*ω p2 Conditions are difficult to meet:

[0008] (1) Process drift problem: resistance Rz and G m，MPO Each has its own process drift, which makes it difficult for Rz to meet R z =(1 / G m，MPO )*(α*C L / C c +1);

[0009] (2) Output current change problem: G m，MPO As the output current changes, it is difficult to meet R under different output current conditions z =(1 / G m，MPO )*(α*C L / C c +1)

But the problem of output current variation still cannot be solved

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