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Pvt stable voltage regulator

a voltage regulator and stable technology, applied in the field of electrical circuits, can solve the problems of poor voltage regulation and significant pvt sensitivity

Inactive Publication Date: 2018-08-16
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes an apparatus that regulates voltage and calibrates current. The apparatus includes a voltage regulation module and an auto-calibration module. The voltage regulation module adjusts the output voltage to match a target voltage, while the auto-calibration module provides a calibration current to compensate for any voltage difference between the target voltage and the output voltage. The voltage regulation module includes an output voltage resistor pair and the output voltage signal is determined by the equation: Vout=Isink·R1+Vref·(1+R1 / R2). The technical effect of this patent is to enable accurate voltage regulation and calibration in a compact and efficient apparatus.

Problems solved by technology

Operating in a deep linear region results significant PVT sensitivity and poor voltage regulation.

Method used

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Embodiment Construction

[0008]At least some of the embodiments disclosed herein recognize that band-gap based voltage references are not available with many process technologies due to non-availability of bipolar devices. Also as supply voltages drop below 1 volt, FET-based reference circuits are used for biasing voltage regulators. Unfortunately, FET-based voltage references vary widely against process (P), voltage (V) and temperature (T) (collectively PVT) variations resulting in large variations in the output voltage of regulators—particularly low drop-out voltage regulators that are needed on integrated circuits.

[0009]To address this situation, digital calibration engines are used to adjust the relationship between the voltage reference input and the regulated output voltage. However, digital calibration engines consume significant chip area and power during calibration and typically can only be adjusted at system initialization. Furthermore, digital calibration complicates the start-up and initializat...

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PUM

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Abstract

An apparatus includes a voltage regulation module configured to provide an output voltage signal (Vout) and an auto-calibration module configured to provide a calibration current signal (Isink) corresponding to a voltage difference between a target voltage signal (Vtarget) and the output voltage signal (Vout). The voltage regulation module may adjust the output voltage in response to changes in the calibration current signal. In one embodiment, the voltage regulation module comprises an output voltage resistor pair of resistance R1 and R2, respectively, and the output voltage signal conforms to the equation Vout=Isink·R1+Vref·(1+R1 / R2).

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates generally to electronic circuits such as integrated circuits, and more particularly to voltage regulators in such circuits.[0002]Voltage regulators, particularly low-dropout voltage regulators, typically use digital calibration engines to tune the regulators and account for process, voltage, and temperature (PVT) related variations in the regulated output voltage. Despite the foregoing, an extreme PVT condition may place a FET driver on the regulator output in a deep linear region of operation instead of the desired saturation region. Operating in a deep linear region results significant PVT sensitivity and poor voltage regulation.SUMMARY[0003]An apparatus includes a voltage regulation module configured to provide an output voltage signal (Vout) and an auto-calibration module configured to provide a calibration current signal (Isink) corresponding to a voltage difference between a target voltage signal (Vtarget) and the ...

Claims

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Application Information

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IPC IPC(8): H03K3/011H02M1/08H02M3/156
CPCH02M1/08H02M3/156H03K3/011G05F1/575
Inventor RAYCHAUDHURI, ARINDAM
Owner IBM CORP