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Article: Amplifier and transistor gains revisited.(TECHNICAL FEATURE)
- Article from:
- Microwave Journal
- Article date:
- April 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 Horizon House Publications, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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There are some fundamental basics on two-port network models. Microwave amplifiers, like the one depicted in the block diagram of Figure 1, have been traditionally designed with scattering parameters with a goal of power gain over some prescribed bandwidth. This model format is justified because, at high frequencies, S-parameters are much more easily and accurately measured than other voltage- or current-based representations. Measuring h-parameters, for example, was a nightmare in the early '60s because of stability problems using a General Radio 1640 Transfer Function Bridge or a Rohde & Schwarz Z-G Diagraph. When the network analyzer became available for the broadband ...