Fast design of unconditionally stable power amplifier using the center frequency smith tube

Unconditional stability is often a desired criterion in amplifier design. The Smith Tube, a three-dimensional cylindrical extension of the Smith Chart with center frequency represented on the height axis, can be used as a tool to design an unconditionally stable amplifier. The stability circles take...

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Bibliographic Details
Published in:	2017 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS) pp. 1 - 4
Main Authors:	Lamers, Lucilia, Walden, Eric, Baylis, Charles, Marks, Ed Viveiros Robert J.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-03-2017
Subjects:	amplifier design Circuit stability Design methodology Electron tubes Power amplifiers Resistors Smith tube Stability criteria unconditional stability
Online Access:	Get full text
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Summary:	Unconditional stability is often a desired criterion in amplifier design. The Smith Tube, a three-dimensional cylindrical extension of the Smith Chart with center frequency represented on the height axis, can be used as a tool to design an unconditionally stable amplifier. The stability circles taken over frequency are extended into a stability surface in the Smith Tube representing regions of stability and instability across a range of frequencies. This aids the designer in selecting parameters that will result in an unconditionally stable amplifier design over all frequencies. While this paper discusses stabilization using the Smith Tube, the Frequency Smith Tube can also be used to assess gain and noise performance over frequency, and to plot the reflection coefficient presented by a matching network to a device as frequency is varied. This allows visualization of a bandwidth-based design in a single view.
DOI:	10.1109/WMCaS.2017.8070700