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A filter synthesis technique applied to the design of multistage broad-band microwave amplifiers

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4 Author(s)
Rooney, J.-P. ; Inst. of Microwaves & Photonics, Leeds Univ., UK ; Parry, Richard ; Hunter, I. ; Pollard, Roger D.

A method for designing multistage broad-band amplifiers based upon well-known filter synthesis techniques is presented. Common all-pole low-pass approximations are used to synthesize prototype amplifier circuits that may be scaled in frequency and impedance. All-pass filters introduced at the first stage are shown to improve input match while maintaining circuit performance less 6 dB gain. A theoretical comparison is made with the distributed amplifier and the cascaded single-stage distributed amplifier. Theoretically, a larger gain-bandwidth product is achieved using the synthesis technique. A proof-of-concept Butterworth low-pass two-stage amplifier was designed, simulated, and measured and achieved a flat gain performance of 1-4 GHz with a power gain of 14.5±1 dB close to the predicted 1-4.2 GHz, 15±1 dB.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:50 ,  Issue: 12 )

Date of Publication:

Dec 2002

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