Traveling-wave amplifiers with prescribed frequency response

Journal Article

Microwave transistor amplifier combinations that have controlled frequency response over a specified bandwidth were designed. Theoretical analysis of such an amplifier with an arbitrary number of sections is presented. The response of the amplifier is controlled by tapering the frequency selectivity or Q of each section of the amplifier. To verify the theory, a three-section amplifier with maximally flat time delay response was designed, constructed, and evaluated. Existing traveling-wave amplifiers were modeled as lossy transmission lines. Although the amplifiers were relatively broadband, a prescribed frequency response was not achieved, and each transistor did not receive an equal portion of the signal power. Resistive elements were required for impedance matching at the input and output. The design seeks to improve on previous techniques by trading bandwidth for controlled gain. By making the transmission line that connects the amplifier sections nonuniform, the frequency response was controlled over the design bandwidth. The designs can easily be implemented using familiar components.

Full Text

Duke Authors

Cited Authors

  • Palmer, WD; Joines, WT

Published Date

  • 1992

Published In

  • Ieee Transactions on Microwave Theory and Techniques

Volume / Issue

  • 40 / 6

Start / End Page

  • 1223 - 1229

Digital Object Identifier (DOI)

  • 10.1109/22.141355