Self-adaption zero-frequency compensation circuit in low-voltage difference linear voltage regulator

A low-dropout linear, zero-frequency technology, applied in the field of adaptive zero-frequency compensation circuits

Active Publication Date: 2011-01-26
江西芯世达微电子有限公司
View PDF5 Cites 41 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention successfully solves the stability problem of the low-dropout linear regulator, and makes the impact of t

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Self-adaption zero-frequency compensation circuit in low-voltage difference linear voltage regulator
  • Self-adaption zero-frequency compensation circuit in low-voltage difference linear voltage regulator
  • Self-adaption zero-frequency compensation circuit in low-voltage difference linear voltage regulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawings and embodiments thereof.

[0023] refer to figure 2 , the present invention includes a transconductance amplifier 1 (OTA), the output terminal of the transconductance amplifier 1 is connected to the gate of the voltage regulating transistor M9 (PMOS) through the voltage buffer 2, and the source of the voltage regulating transistor M9 is connected to the power supply terminal Vin , the drain is connected to the feedback network formed by the two voltage dividing resistors R1 and R2, and the middle end of the feedback network is connected to the inverting input terminal of the transconductance amplifier 1 .

[0024] The present invention also includes a current detection circuit 4, one end of which is connected to the common end of the voltage buffer 2 and the voltage regulating tube M9, and the other end is connected to the adjustment end of a variable resistance circuit 3, a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a self-adaption zero-frequency compensation circuit in a low-voltage difference linear voltage regulator. The output end of a transconductance amplifier is connected with a voltage regulation pipe by a voltage bumper, a current detection circuit is connected with the voltage bumper and the common end of the voltage regulation pipe, and the other end is connected with a variable-resistance circuit connected with the compensation end of the transconductance amplifier. In the invention, when a load is higher and current is lower, the current detection circuit can detect the load and the current and the load and the current act on the variable-resistance circuit at the moment to ensure that the resistance is enlarged, and the zero position is also relatively lower; on the contrary, when the load is reduced and the current is enlarged, the resistance value of the variable-resistance circuit is reduced, and the zero position is higher. Therefore, the self-adaption zero can change along with the change of a pole so that the compensation circuit takes the effect of compensation and effectively ensures the stable state of system operation. The compensation circuit successfully solves the problem of poor stability of a low-voltage difference linear voltage regulator so that a load capacitance equivalent series resistance is not really important to the influence on system stability, transient response and ripple waves.

Description

【Technical field】 [0001] The invention belongs to a low-dropout linear voltage stabilizer in a large-scale analog integrated circuit, in particular to an adaptive zero-point frequency compensation circuit in the low-dropout linear voltage stabilizer. 【Background technique】 [0002] A typical low-dropout linear regulator in the prior art generally consists of a voltage reference Vref, a transconductance amplifier OTA, a buffer BUFFER, a feedback network composed of voltage dividing resistors R1 and R2, and a voltage regulator PMOS, see figure 1 . Among them, the capacitor CL is the output load capacitor to optimize the transient response, and the resistor ESR is the parasitic equivalent series resistance of the capacitor CL. [0003] figure 1 In the circuit, the load capacitance CL and the resistance seen from node C form the main pole, and the parasitic capacitance at node A and the output resistance of the transconductance amplifier OTA form the second pole. Because the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G05F1/565
Inventor 肖国庆杨波
Owner 江西芯世达微电子有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap