A Multiband Power Amplifier With a Reconfigurable Output-Matching Network for 10-MHz BW LTE Mobile Phone Applications

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 BSC and varactor diodes of the TTL in the reconfigurable output-matching network. This MBPA delivered a gain of more than 11 dB, an adjacent channel leakage ratio of the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (E-UTRA) smaller than -32 dBc, and a power-added efficiency larger than 29% at the output power of 26 dBm for high and low frequency bands with a 10-MHz 16-quadrature amplitude modulation Long-Term Evolution signal.