BROADBAND TRANSFORMER DESIGN FOR RF TRANSISTOR POWER AMPLIFIERS

Abstract

Various forms of broadband transmission line transformers for use through VHF and concepts basic to their operation are summarized and described. Broadband power adding and power dividing hybrids for push-pull amplifiers and parallel additive uses are given similar attention. The design of broadband input and output matching elements for a single-ended stage using a 2N5071 transistor for 30 W of output power from 30 to 80 MHz is illustrated. Useful curves for guiding the design of 4:1 transformers with resistive loads are given. Curves showing typical input impedance versus frequency of a pair of cascaded 4:1 transformers loaded by the large signal R-L-C equivalent input circuit of the 2N5071 are included. The use of hybrids to operate a pair of these transistors in push-pull operation is described.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1968
Accession Number
AD0676816

Entities

People

  • Octavius Pitzalis Jr.
  • Thomas P. Couse

Organizations

  • United States Army Communications-Electronics Command

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Amplifiers
  • Bandwidth
  • Broadband
  • Computer Programming
  • Electronics
  • Frequency
  • Frequency Bands
  • Impedance
  • Insertion Loss
  • Materials
  • Measurement
  • Power Amplifiers
  • Push Pull Amplifiers
  • Radio Frequency Power
  • Strip Transmission Lines
  • Transistors
  • Transmission Lines

Readers

  • Electronics Engineering
  • Microwave Engineering.