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http://dx.doi.org/10.5762/KAIS.2015.16.1.720

Design of Wideband Cascode Amplifiers Using a Feedback Structure  

Lee, Jaehoon (Department of Electrical Engineering, Soonchunhyang University)
Lim, Jongsik (Department of Electrical Engineering, Soonchunhyang University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.16, no.1, 2015 , pp. 720-725 More about this Journal
Abstract
This paper describes the design of a wideband cascode amplifier using a feedback network and microwave small-signal transistors. The adopted cascode structure enables the miller effect to be lessened, cutoff frequency to increase, and reduction of gain in the mid-band to be mitigated. In addition, a feedback network is added to the cascode structure to improve the input matching and ripple performances over the wide operating band. The designed cascode amplifier contains a feedback network for small size and broadband amplification, whereas balanced amplifiers and distributed amplifiers have been used widely. The measurement shows $8.5dB{\pm}1.5dB$ of gain over 1000-2000MHz. The fabricated cascode amplifier has more than 8dB of gain over a 1000MHz bandwidth with a good flatness. The measured performances agree with the predicted ones even a minor shift in operating frequency is observed.
Keywords
Amplifiers; cascode; feedback; wideband;
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