http://iet.metastore.ingenta.com
1887

High-efficiency Doherty power amplifiers

High-efficiency Doherty power amplifiers

For access to this article, please select a purchase option:

Buy chapter PDF
$16.00
(plus tax if applicable)
Buy Knowledge Pack
10 chapters for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Radio Frequency and Microwave Power Amplifiers. Volume 2: Efficiency and Linearity Enhancement Techniques — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This chapter discusses the power amplifier technique for amplitude-modulated (AM) radio-frequency signals was invented by William H. Doherty in broadcasting in the mid-1930s as a more efficient alternative to both conventional amplitude-modulation techniques and Chireix outphasing [4]. The amplifier was configured in a grounded-cathode structure where two vacuum tubes were connected in parallel, one as a Class B carrier tube and the other as a Class C peaking tube, and the tubes were split and combined through þ90° and -90° phase shifting networks. This novel power amplifier architecture removed limitation of low efficiency inherent in a conventional power amplifier circuit, permitting efficiencies of 60% to 65% to be realized, while retaining the principal advantages associated with low-level modulations systems and linear power amplifiers.

Chapter Contents:

  • 2.1 Basic Doherty amplifier structure
  • 2.2 Asymmetric Doherty amplifiers
  • 2.3 Multistage Doherty amplifiers
  • 2.4 Inverted Doherty amplifiers
  • 2.5 Integrated Doherty amplifiers
  • 2.6 Broadband Doherty amplifiers
  • References

Inspec keywords: vacuum tubes; radiofrequency power amplifiers; amplitude modulation; radio broadcasting

Other keywords: vacuum tubes; linear power amplifiers; conventional power amplifier circuit; low-level modulations systems; amplitude-modulated radio-frequency signals; grounded-cathode structure; high-efficiency Doherty power amplifiers; power amplifier architecture; Chireix outphasing

Subjects: Radio and television broadcasting; Vacuum tubes; Amplifiers

Preview this chapter:
Zoom in
Zoomout

High-efficiency Doherty power amplifiers, Page 1 of 2

| /docserver/preview/fulltext/books/cs/pbcs071g/PBCS071G_ch2-1.gif /docserver/preview/fulltext/books/cs/pbcs071g/PBCS071G_ch2-2.gif

Related content

content/books/10.1049/pbcs071g_ch2
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address