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A single-chip power amplifier (PA) with a reconfigurable output-matching network is presented for fourth-generation multiband mobile phone applications. The multiband PA (MBPA) consists of an amplifier and a reconfigurable output-matching network [a band selection circuit (BSC) and a tunable transmission line (TTL)]. Multiband load-impedance modulation is done by controlling a p-i-n switch of the...
This paper presents a single chip multiband power amplifier (MBPA) using a proposed active load modulation (ALM) technique. Based on Doherty PA's concept, the single chip MBPA consists of a main amplifier, an auxiliary amplifier, and transmission lines connecting two amplifiers to modulate the main amplifier's load line over the frequency. The ALM technique achieves the desired load line at specific...
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