Browse Prior Art Database

On-Chip Reference Voltage Regulator

IP.com Disclosure Number: IPCOM000035292D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Nguyen, Q: AUTHOR

Abstract

To continue the use of standard power supplies and yet reduce on-chip voltage to preserve high reliability of miniaturized circuitry, on-chip voltage conversion is necessary. This circuit provides a regulated reference voltage Vref below the level of incoming supply voltage Vdd. Vref is insensitive to Vdd variation and has quick recovery from voltage perturbations.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

Page 1 of 2

On-Chip Reference Voltage Regulator

To continue the use of standard power supplies and yet reduce on-chip voltage to preserve high reliability of miniaturized circuitry, on-chip voltage conversion is necessary. This circuit provides a regulated reference voltage Vref below the level of incoming supply voltage Vdd. Vref is insensitive to Vdd variation and has quick recovery from voltage perturbations.

The circuit is shown in the figure. It consists of three parts: reference generation circuits (transistors T1 through T5, and T11 through T14), a differential amplifier (transistors T6 through T10), and inverter-amplifiers (T17 through T19, and T20 through T22). Outputs of the two reference generation circuits are fed to inputs Vref and N2 of the differential amplifier. Outputs of the differential amplifier are fed to inputs N3 and N4 of the two inverter-amplifier circuits. Outputs N6 and N7 of the inverter-amplifiers then control the Vref output through transistors T15 and T16.

The output Vref provides a feedback path to the differential amplifier and is constantly compared with node N2. If Vref and node N2 are equal in potential, transistors T15 and T16 are turned off. If Vref is less than the potential at node N2, transistor T15 turns on and pulls Vref up until Vref is equal to the potential of node N2. If Vref is higher than the potential at node N2, transistor T16 turns on and dumps charge from Vref to ground until Vref is equal to the potential on node N2. This...