A discrete distributed power amplifier for VHF to UHF
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Date
2008
Authors
Tan, Teik Siew
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Abstract
Wide bandwidth power amplifiers are key components in Software-Defined Radio
technology. However, the conventional broadband power amplifier has poor
bandwidth that limited by the transistor’s gain-bandwidth product. To overcome the
conventional gain-bandwidth tradeoff, distributed amplifier topology is often used by
combining the outputs from several active gain elements in an additive fashion.
However, the conventional distributed amplifier has poor power and efficiency due
to the drain line reverse wave. To obtain efficiency and power with wideband
application, a tapered distributed power amplifier has been developed, where in
theoretically it forces all the power to deliver to the output load. A tapered distributed
power amplifier using discrete RF MOSFET devices, RD01MUS1 from Mitsubishi
was fabricated and achieved 1 Watt output power with 13 dB associated gain with 25
% of power added efficiency (PAE) over 100 MHz to 600 MHz. This relatively wide
bandwidth (500 MHz) performance for tapered distributed power amplifier is better
than conventional broadband power amplifier with bandwidth of only 180 MHz.
Description
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Keywords
Science physic , Power amplifier