Accession Number:

AD0735755

Title:

Common-Base vs. Common-Emitter Performance and Reliability for VHF Stages.

Descriptive Note:

Final rept. 25 Feb 70-24 Mar 71,

Corporate Author:

RCA SOLID STATE DIV SOMERVILLE N J

Personal Author(s):

• Chang,Z. F.

Report Date:

1972-01-01

Pagination or Media Count:

63.0

Abstract:

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

Descriptors:

• *POWER AMPLIFIERS
• *TRANSISTOR AMPLIFIERS
• P BAND
• BROADBAND
• VERY HIGH FREQUENCY
• ULTRAHIGH FREQUENCY
• RELIABILITY(ELECTRONICS)

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE