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Pole-zero tracking compensation network for voltage regulators

A technology of compensation network and regulator, applied in the field of compensation network

Pending Publication Date: 2020-01-21
INFINEON TECH AUSTRIA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resulting linear regulator may only be stable (with sufficient phase margin) over a fairly limited current range

Method used

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  • Pole-zero tracking compensation network for voltage regulators
  • Pole-zero tracking compensation network for voltage regulators
  • Pole-zero tracking compensation network for voltage regulators

Examples

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Embodiment Construction

[0020] Embodiments described herein provide compensation networks and associated methods for compensating the frequency and phase response of a linear regulator to ensure stable operation of the regulator over a wide range of output currents. Embodiments are primarily described in the context of a low dropout (LDO) linear regulator using a p-channel metal oxide semiconductor field effect transistor (pMOSFET) as the pass device. However, the invention is not limited to LDO regulators based on such transfer devices. For example, the compensation network described can be readily used with LDO regulators using PNP bipolar junction transistors (BJTs) that have similar impedance characteristics (and associated poles) to pMOSFET pass devices. Still further, linear regulators using other types of pass devices (eg, NPN BJT, n-channel MOSFET) may also advantageously use the compensation network described below. Still further, the described compensation network can be used to stabilize ...

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PUM

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Abstract

The embodiments of the invention relates to pole-zero tracking compensation network for voltage regulators. Compensation circuits, compensated voltage regulators, and methods are provided for stabilizing voltage regulators, or other circuits that use operational amplifiers, over a wide range of output current. The described techniques provide a zero whose frequency varies linearly with an output current, and which can be used to track and compensate for a pole whose frequency similarly varies with the output current. The variable-frequency zero is created using a compensation capacitor placedin series with a variable resistance, wherein the resistance is configured to vary linearly with the output current. A pole-tracking zero generated in this way may be used to overcome difficulties encountered when the gain of a system includes a pole whose frequency varies with output current, and serves to improve the phase margin of amplifier circuitry, including that used within voltage regulators, and / or serves to ensure stability over a wide range of output current.

Description

technical field [0001] The present application relates to a compensation network for a voltage regulator, wherein the compensation network provides a zero whose frequency follows the output current of the voltage regulator in order to compensate a variable pole of the voltage regulator. Background technique [0002] Linear voltage regulators, including low dropout (LDO) regulators, use pass devices to provide a relatively constant voltage level to an output load. A control signal provided to a control terminal of the transfer device determines the amount of current flowing through the transfer device in order to maintain a relatively constant voltage level. In a general implementation of an LDO regulator, the pass device is a p-channel metal oxide semiconductor field effect transistor (pMOSFET), and the control terminal is the gate of the pMOSFET. A typical linear voltage regulator also includes an error amplifier that generates a control signal based on the difference betw...

Claims

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56G05F1/565G05F1/575G05F1/562G05F1/567
Inventor A·桑布科E·A·普伊亚
Owner INFINEON TECH AUSTRIA AG
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