LDO circuit using bidirectional asymmetry buffer structure to improve performance

A buffer and asymmetric technology, applied in the direction of instruments, adjusting electrical variables, control/regulation systems, etc., can solve problems such as increasing LDO quiescent current, reducing LDO power supply voltage rejection ratio, increasing circuit complexity, etc., to achieve expansion of unity gain Wider bandwidth, improved transient response performance, and flexible circuit configuration
CN100549898CInactive Publication Date: 2009-10-14BEIJING MXTRONICS CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING MXTRONICS CORP
Publication Date
2009-10-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

An LDO circuit that uses a bidirectional asymmetric buffer structure to improve performance. A bidirectional asymmetric buffer structure is used to provide a feedback path with a signal reverse function and a forward path with a signal same direction function. The feedback path is used to realize the frequency of the LDO circuit. To compensate and improve the transient response performance, the forward path is used to offset the right half-plane zero point generated by the gate-drain parasitic capacitance of the LDO transmission element, thereby improving the stability of the system and expanding the unity gain bandwidth. The circuit has the advantages of simple structure, low power consumption, and can effectively eliminate the zero point of the right half plane.
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Description

Technical field

[0001] The invention relates to an LDO circuit, in particular to an LDO circuit that uses a bidirectional asymmetric buffer structure to effectively eliminate the right half-plane zero in a low dropout linear regulator, thereby enhancing loop stability and improving system performance. Background technique

[0002] A closed-loop negative feedback system is usually used in linear circuits. For example, in a Low-Dropout Voltage Regulator (LDO), a feedback loop is used to obtain a stable output voltage. In order to reduce the input and output voltage difference (Dropout voltage) and enhance the current drive capability, the transmission element in the LDO (also called transmission tube, pass tube, power tube, Pass Element, Power Device, etc.) usually has a great aspect ratio ( Such as 20000μm / 1μm), so its gate-drain parasitic capacitance C gd Usually larger (such as 10pF). Parasitic capacitance C gd And the transconductance g of the transmission element mp Form a fre...

Claims

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