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Design of a Microwave Distributed Amplifier Considering Capacitance Absorption Capability  

Kim, Nam-Tae (School of Electronics and Telecommunication Eng., Inje University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.46, no.11, 2009 , pp. 50-55 More about this Journal
Abstract
In this paper, a distributed amplifier is designed using distributed network synthesis that provides the optimum absorption capability of a capacitance. Transfer functions of filters, which consist of the amplifier, are synthesized by a low-pass Chebyshev approximation. Capacitances that a filter network can absorb are calculated as a function of its minimum insertion loss(MIL) and ripple. Active devices in a distributed amplifier are modeled as equivalent circuits by using their S-parameters, and their equivalent capacitances are absorbed into filter structures by properly adjusting the MIL and ripple of a transfer function. As an application example, a distributed amplifier with the gain of about 12.5dB is designed that operates over the frequency range between 0.1 and 7.5GHz. Experimental results prove that distributed network synthesis, which considers capacitance absorption capability, is useful to the design of distributed amplifiers.
Keywords
distributed amplifier; traveling-wave amplifier; parasitic absorption; network synthesis;
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