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We present a fully integrated 2×2 MIMO CMOS LTE RF transceiver along with multi-band InGaP/GaAs HBT power amplifiers for LTE-A small cell (femtocell) base stations. The transceiver features highly integrated LNAs and drive amplifiers with 24 individual RF I/O pins. The multi-band PAs achieves ACLR <-45dBc at 25dBm with PAE >38% at 33dBm by employing a third-order intermodulation distortion (IMD3)...
In this paper, a fully integrated high-efficiency linear CMOS power amplifier (PA) is developed for 802.11g WLAN applications with the proposed power combining transformer. In comparison with conventional power combining transformers, the proposed power combining transformer can offer high-efficiency performances with a smaller die size. The fabricated two-stage PA using a 65nm CMOS technology achieves...
A fully integrated power amplifier operating at switching and linear mode is implemented using 0.18-μm CMOS technology. To maximize performance for both operation modes, the fundamental load impedances are optimized with a variable capacitor for GSM and EDGE application. For GSM application, 32 dBm of the output power with 45 % of the drain efficiency is achieved at 1.76 GHz. With EDGE modulation...
A highly efficient CMOS linear power amplifier for WCDMA applications with feedback bias technique is presented. The method involves connecting the gates of common-gate devices of the driver stage and the power stage in cascode configurations by a feedback network for enhancing linearity. To achieve high efficiency and linearity simultaneously, large-signal IMD minimum (IMD sweet spot) is properly...
A high-power single-pole-double-throw (SPDT) antenna switch using a differential architecture and a multi-section impedance transformation technique is demonstrated in a standard 0.18-μm CMOS process. The differential architecture prevents unwanted channel formation of OFF-state Rx switch transistors by relieving the voltage swing over the Rx switch devices. In addition to this architecture, impedance...
In this paper, a novel level shifting digital linear amplifier with nonlinear components (LINC) transmitter for OFDM system is presented. By using a multi-level switched power supply, the final power added efficiency is significantly improved compared to a conventional LINC amplifier. Moreover, with digital phase offset cancellation scheme, the transmitter has a good linearity as well. This work was...
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