Common-Base vs. Common-Emitter Performance and Reliability for VHF Stages.
Final rept. 25 Feb 70-24 Mar 71,
RCA SOLID STATE DIV SOMERVILLE N J
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Two broadband amplifier chains were developed for operation with a minimum output power of 10watts over the 225- to 400-megahertz band. Four stages were used in each chain, with each stage having 50-ohm input and output terminals. The stages in one amplifier chain operated in the common-base configuration the other chain used common-emitter stages. Comparison of the rf performance of the two amplifier chains showed that common-base amplifiers provided a flatter output response, a higher power gain, and a lower input VSWR than common-emitter amplifiers. Infrared scanning performed on the output stages indicated that the common-base amplifier also had a lower junction spot temperature. In high-power common-base operation, extremely low base-lead inductance was necessary to prevent the amplifier from becoming regenerative. Author
- Electrical and Electronic Equipment