Baseband impedance and linearization of FET circuits

James Brinkhoff*, Anthony Edward Parker, Martin Leung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Baseband impedance has been identified as having a positive or negative effect on the intermodulation distortion of microwave circuits. The effect can be assessed or utilized with the aid of previously proposed figures-of-merit. Under certain situations, intermodulation cancellation can be achieved simply by adding resistance to the bias network. The impact of baseband impedance on the performance of derivative superposition amplifiers is analyzed. A bias region was studied that exhibits a good second- and third- order intermodulation null with minimal intermodulation dependence on baseband impedance. This allows the effective use of the derivative superposition technique in baseband amplifiers, as well as giving wide-band linearization performance in RF amplifiers.

Original languageEnglish
Pages (from-to)2523-2530
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
Publication statusPublished - Dec 2003

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