October 2012
Intermediate to advanced
860 pages
23h 37m
English
Content preview from RF Circuit Design, 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 21
PA (Power Amplifier)
21.1 Classification of PA
A PA (power amplifier) is an amplifier that intensifies the power of an input signal (Fig. 21.1).
Figure 21.1 Representation of a power amplifier.
Its output power is G times its input power. The added portion of the output power is AC power converted from the DC power supply. The ratio of the added portion of the power to the input power is called its PAE (power added efficiency), that is,
21.1 
21.2 
21.3 
21.4 
where
Pout, watt = the output power in watts,
Pin, watt = the input power in watts,
Pout, dB = the output power in decibels,
Pin, dB = the input power in decibels,
Gwatt = the power gain in watts,
GdB = the power gain in decibels,
ΔP = the difference between output and input power in watts,
PDC = the DC power from the DC power supply, and
PAE = the power added efficiency in percent.
In a PA design, the most important goal is the power conversion efficiency from DC power to AC power, which combined with the input power ...
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.