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A CMOS Switched-Capacitor Boost Mode Envelope Tracking Regulator with 4% Efficiency Improvement at 7.7dB PAPR for 20MHz LTE Envelope Tracking RF Power Amplifiers | IEEE Conference Publication | IEEE Xplore

A CMOS Switched-Capacitor Boost Mode Envelope Tracking Regulator with 4% Efficiency Improvement at 7.7dB PAPR for 20MHz LTE Envelope Tracking RF Power Amplifiers


Abstract:

In this paper, the switched-capacitor boost (SCB) mode envelope tracking (ET) technique with a switched-capacitor circuit and a low dropout (LDO) regulator are used to re...Show More

Abstract:

In this paper, the switched-capacitor boost (SCB) mode envelope tracking (ET) technique with a switched-capacitor circuit and a low dropout (LDO) regulator are used to replace conventional envelope tracking regulators. At a Peak-to-Average Power Ratio (PAPR) of 7.7dB common for LTE communication, the efficiency is 72%, which is 4% higher than the theoretical limit of conventional ET techniques. When PAPR increases from 6.1dB to 7.3dB, the conventional ET efficiency decreases from 82% to 69% whereas the SCB mode increases by 2%.
Date of Conference: 04-06 November 2019
Date Added to IEEE Xplore: 06 April 2020
ISBN Information:
Conference Location: Macau, Macao

I. Introduction

A radio frequency (RF) power amplifier (PA) is a sensitive circuit that requires a well-regulated voltage supply. A standalone buck regulator generates a fixed supply voltage Vreg to meet the maximum output voltage Vout required by the PA but high peak-to-average power ratio (PAPR) results in a Vreg significantly higher than the averaged Vout. Significant power loss occurs across the RF PA due to the difference between Vreg and Vout through heat dissipation, as shown in Fig. 1(a).

References

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