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A Single Switcher Combined Series Parallel Hybrid Envelope Tracking Amplifier for Wideband RF Power Amplifier

Nijad Anabtawi¹, Rony Ferzli², Haidar M Harmanani³

¹Intel Corporation, School of Electrical, Computer & Energy Engineering, Arizona State University.

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|September 19, 2017

Summary

This study introduces an efficient RF power amplifier supply modulator using a dual-output switched mode regulator and linear regulator. The novel design enhances power efficiency and reduces system complexity for RF applications.

Keywords:

4G LTE RF envelope tracking power amplifier supply modulator

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Area of Science:

Electrical Engineering
Electronics Engineering
Telecommunications Engineering

Background:

Radio Frequency (RF) power amplifiers require efficient supply modulators to meet performance demands.
Existing envelope tracking (ET) supply modulators face challenges in balancing efficiency, bandwidth, and complexity.

Purpose of the Study:

To present an improved architecture for RF power amplifier envelope tracking (ET) supply modulators.
To enhance power efficiency and reduce system complexity in ET supply modulators.

Main Methods:

A novel architecture combining a single switched mode supply regulator with two outputs and one linear regulator.
The switched mode regulator provides a wideband, high-efficiency supply to the RF amplifier and a band-limited supply to the linear regulator.
Implementation in a 14nm CMOS process and validation through simulations.

Main Results:

Achieved a peak efficiency of 74% for a 6 dB PAPR 20MHz LTE signal at 29dBm output power.
Demonstrated improved power efficiency, reduced system complexity, and area savings.
The dual-output switched mode regulator requires a single inductor and a simple control loop.

Conclusions:

The proposed ET supply modulator architecture offers significant improvements in efficiency and system design.
This design is suitable for advanced RF power amplifier applications demanding high performance and efficiency.
The 14nm CMOS implementation validates the effectiveness of the proposed modulator design.