Dynamic bias circuit applied to LDO (Low Dropout Regulator) and LDO using dynamic bias circuit

Abstract

The invention discloses a dynamic bias circuit applied to an LDO (Low Dropout Regulator). The dynamic bias circuit comprises a constant bias current generation module, a self-adaptive steady state bias current generation module, a self-adaptive transient bias current generation module and a bias voltage generation module, wherein the self-adaptive stead state bias current generation module provides self-adaptive steady state bias current, and the self-adaptive steady state bias current can adaptively adjust the bias current of the loop according to the magnitude of the load current; the self-adaptive transient bias current generation module provides self-adaptive transient bias current, by applying the transient detection technology, more current is consumed at the moment of load jumping, and transient performance is improved. The invention further discloses an LDO applying the dynamic biasing circuit, the transient characteristic is enhanced through connection of modules such as the dynamic biasing circuit, a push-pull amplifier, a power adjusting tube MP power, a compensation capacitor Cm, a capacitor CL and a resistor RL, and the LDO can cope with different load conditions with high performance while keeping low power consumption.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuit design, in particular to a dynamic bias circuit applied to an LDO and an LDO using the dynamic bias circuit. Background technique [0002] Advanced portable electronic devices, such as smart bracelets and notebook computers, usually contain different circuit modules, such as analog modules, digital modules, radio frequency modules, and interface circuit modules. Different modules require different power supply voltages. Therefore, these A specific power management unit is usually integrated in the device to provide stable and clean voltage for different modules. In particular, low dropout linear regulators are widely used in various electronic devices due to their low noise and small ripple. As a power module integrated in a portable electronic device, in order to reduce the chip manufacturing cost and make the product more compact and portable, the designed LDO (Low Dropout Lin...

AI Technical Summary

Problems solved by technology

In addition, portable electronic products are usually powered by batteries. In order to improve battery life, it is necessary to design LDOs that consume as little static power as possible.

[0003] The large-signal and small-signal transient response speeds of the LDO are proportional to the slew rate and loop bandwidth, respectively, and to increase the loop bandwidth and slew rate requires increasing the static power consumption of the circuit

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