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Dynamic Error Correction of Voltage Regulators and Voltage Monitor Circuits by Reference Ground Shifting

IP.com Disclosure Number: IPCOM000241893D
Publication Date: 2015-Jun-05
Document File: 4 page(s) / 370K

Publishing Venue

The IP.com Prior Art Database

Abstract

In deep sub micron SOC's power and ground grid size is increasing, and with it, the IR drop is increasing, supply voltage is decreasing, and the difference between the highest voltage and the lowest voltage that can be applied across a logic circuit is shrinking. Thus it is becoming extremely difficult to meet supply voltage specifications. The circuitry may fail timing requirements if the supply voltage is too low or fail upper limit for reliability specifications if the supply voltage is too high. The approach of taking a fixed margin for supply design is becoming a bottleneck in the over all supply voltage planning for DSM SOC’s. One error source is ground potential difference between analog and digital ground hot point. In the paper, we propose a circuit for dynamic correction of the ground potential of an analog reference voltage to mitigate errors of voltage monitor circuits and voltage regulator circuits due to relative ground voltage difference. VBG/R current flowing in a resistive ladder generates a reference voltage, the ground potential of this ladder is dynamically shifted for correcting the ground potential difference between analog and digital. No low frequency pole, zero is introduced in the analog loops due to the feedback, thus the feedback will not interfere with system stability.

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Dynamic Error Correction of Voltage Regulators and Voltage Monitor Circuits by Reference Ground Shifting

                                                                                                         

Abstract 

In deep sub micron SOC's power and ground grid size is increasing, and with it, the IR drop is increasing, supply voltage is decreasing, and the difference between the highest voltage and the lowest voltage that can be applied across a logic circuit is shrinking.  Thus it is becoming extremely difficult to meet supply voltage specifications.  The circuitry may fail timing requirements if the supply voltage is too low or fail upper limit for reliability specifications if the supply voltage is too high.  The approach of taking a fixed margin for supply design is becoming a bottleneck in the over all supply voltage planning for DSM SOC’s.  One error source is ground potential difference between analog and digital ground hot point.  In the paper, we propose a circuit for dynamic correction of the ground potential of an analog reference voltage to mitigate errors of voltage monitor circuits and voltage regulator circuits due to relative ground voltage difference.  VBG/R current flowing in a resistive ladder generates a reference voltage, the ground potential of this ladder is dynamically shifted for correcting the ground potential difference between analog and digital.  No low frequency pole, zero is introduced in the analog loops due to the feedback, thus the feedback will not interfere with system stability.

Problem Definition

Fixed margins for ground IR drop could go wrongwith aging or manufacturing defects.  We propose a circuit that will take care of this by removing fixed margin and changing references dynamically.

Solution

A method and circuit implementation are proposed where reference voltage ground shift is used to correct errors in voltage regulation and voltage monitoring due to ground voltage difference between regulator/voltage monitor and digital core ground.  This...