December 2014
Intermediate to advanced
688 pages
18h 19m
English
Content preview from RF Power Amplifier, 2nd Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 9Linearization and Efficiency Improvements of RF Power Amplifiers
9.1 Introduction
High efficiency and high linearity of power amplifiers [1–85] are of primary importance in wireless communication systems. Wireless communication systems transmit voice, video, and data with high data rates. High efficiency is required for low energy consumption, a longer battery lifetime, and thermal management. Linearity is required for achieving low distortion of the amplified signals. The radio-frequency (RF) power amplifier specifications call for intermodulation (IM) levels of 
dBc. Linearity and efficiency enhancement techniques of RF power amplifiers, which are used in transmitters, are studied in this chapter.
Signals used in modern digital wireless communications systems have a time-varying envelope (amplitude modulation; AM) and time-varying angle (phase modulation; PM)
9.1 
A nonconstant envelope signal requires linear power amplifiers in the transmitters. The output power in CDMA2000 and WCDMA transmitters may vary in a wide dynamic range of 80 dB. The average output power is usually lower than the peak power by 15–25 dB. The transmitters must be designed for the maximum output power. A high peak-to-average ratio (PAR) drives many power amplifiers into saturation, causing signal ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.