Browse Prior Art Database

Local Power Supply Regulator

IP.com Disclosure Number: IPCOM000130167D
Original Publication Date: 2005-Oct-14
Included in the Prior Art Database: 2005-Oct-14
Document File: 2 page(s) / 29K

IBM

Abstract

As cmos technology advances, power consumption is rising. This increase in power lends to resistive drops in power supply voltage. Furthermore the amount of voltage drop is variable across the chip. The variation in power supply voltage is a problem because at best low supply voltages slow down the chip while high supply voltages waste power, and at worst they may cause functional or reliability fails.The circuit disclosed here is solving the voltage drop issue by using active circuits that boost up the current supplied by the Vdd bus

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Local Power Supply Regulator

The circuit disclosed here uses a differential pair that compares Vcircuit (the voltage applied on the circuit = VDD - I x R) to Vdd ref (a reference voltage). When Vcircuit drops below Vdd ref, the differential pair turns on a transistor (labelled M7 in figure 1) which then supplies additional current to the circuit.

This circuit is boosting a regular power supply, allowing for little power to be wasted through M7 while ensuring that the voltage doesn't drop below a reference voltage.

Figure 1 - Schematic of the circuit

I tail

Vdd Diff

Vdd Ref

VDD +

M7

Vdd

Circuit

Figure 2 - Shows how the stabilized voltage compares with the voltage one would get without this regulator.

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Supply voltage vs Current Consumption

1.21

1.2

Volts

1.19

1.18

1.17

1.16

0 0.002 0.004 0.006 0.008 0.01 0.012

Amps

Vref vdd (stabilized) Vdd (not stabilized)

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