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Method of Recycling Decoupling Capacitor Charge

IP.com Disclosure Number: IPCOM000203570D
Publication Date: 2011-Jan-28
Document File: 3 page(s) / 26K

Publishing Venue

The IP.com Prior Art Database

Abstract

Modern mobile IC’s requires aggressive power management solution, integrated on the die, including on-die regulators. It requires connecting external decoupling capacitor on the regulator output.

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Method of Recycling Decoupling Capacitor Charge

Abstract

Modern mobile IC’s requires aggressive power management solution, integrated on the die, including on-die regulators. It requires connecting external decoupling capacitor on the regulator output.

Introduction

Modern mobile IC’s requires aggressive power management solution, integrated on the die, including on-die regulators. It requires connecting external decoupling capacitor on the regulator output.

From another hand, power gating technique is still required to save power during long periods of standby mode.

Power gating of supply with external decoupling capacitors means wasting charge, stored on this capacitor

Fig. 1 demonstrates the scenario, when external bypass capacitor energy is wasted, during power gating.

                                                             Fig. 1

Proposed solution

The main idea is to use charge on decoupling capacitor for execution stop routine on entering standby mode.

Depends on implementation, some routine should be executed. It can be storing data in external memory or configuration of some module for standby mode.

If routine is too long, to be executed fully from decap charge, then optimal point for disabling regulator can be estimated from information on routine, operating frequency/voltage, leakage, etc.

Fig. 2 shows scenario, when external bypass capacitor energy is used for stop routine execution.

Fig. 2.

To ge...