An LDO circuit that can output low noise and high psrr
A low-noise, circuit-based technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as long recovery time, MOS tube breakdown start-up time, and large overshoot voltage, so as to improve the power supply rejection ratio, The effect of saving chip area and reducing noise
Active Publication Date: 2022-07-01
深圳市时代速信科技有限公司
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Problems solved by technology
[0004] However, the existing low-dropout linear regulator (LDO) has the following technical problems: Since the low-dropout linear regulator (LDO) needs to rely on the off-chip capacitor to realize the step-down function, the low-dropout linear regulator (LDO) is increased. Area, and part of the design in order to obtain higher power supply rejection ratio (PSRR) or better noise performance, at the expense of transient response, resulting in excessive overshoot voltage or too long recovery time, which may cause MOS tube failure Breakdown or startup time is too slow
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[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0025] The existing low-dropout linear regulator (LDO) has the following technical problems: Since the low-dropout linear regulator (LDO) needs to rely on off-chip capacitors to achieve the step-down function, the area of the low-dropout linear regulator (LDO) is increased. , and some designs are designed to obtain higher power supply rejection ratio (PSRR) or better noise performance, at the expense of transient response, resulting...
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The invention discloses an LDO circuit capable of outputting low noise and high PSRR. The circuit comprises: an enabling module, a pre-stabilizing module, an error amplifier module, a filter module, a clock module, a current source, a power tube and a mos tube M4. The invention adopts the RC low-pass filter structure to prevent the noise generated by the bandgap reference voltage source and the feedback network from being transmitted to the output end, thereby reducing the noise of the output signal of the LDO circuit, and the invention adopts the bandgap reference voltage source of the high PSRR structure, combined with The high-gain error amplifier can improve the power supply rejection ratio of the LDO circuit output. In addition, the present invention can form a large resistance by combining a MOS tube and a 1nA current source, saving chip area and simplifying the circuit structure.
Description
technical field [0001] The present invention relates to the technical field of electronic equipment, and in particular, to an LDO circuit capable of outputting low noise and high PSRR. Background technique [0002] With the continuous development of science and technology, portable devices have become an indispensable item in people's lives, and the functions of electronic devices have become more and more abundant and comprehensive. essential. [0003] However, the currently commonly used offline power sources such as batteries or generators can no longer meet the requirements of today's high-precision and high-speed electronic equipment for power supply. Therefore, a power management chip is required to optimize the external power supply. One of the common optimized processing devices is a low dropout linear regulator (LDO), which is not only simple in structure but also enables step-down operation. [0004] However, the existing low dropout linear regulator (LDO) has th...
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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 周勇王子函孟帆
Owner 深圳市时代速信科技有限公司