Abstract
A broadband 180 nm CMOS power amplifier (PA) operating from a frequency bandwidth of 400 MHz to 2.8 GHz is presented in this paper. The PA is integrated with an inductor-less Broadband-Pre-Distorter (BPD) to enhance its linearity for wide bandwidth. The BPD consists only of MOS transistors, resistors, and capacitors which contribute to the wideband operation thus independent of the Q factor of passive inductors which contributes to the effectiveness of many other APDs available. The integrated BPD improves the Amplitude Modulation-to-Amplitude Modulation (AM-AM) and Amplitude Modulation-to-Phase Modulation (AM-PM) deviation of the PA across maximum linear output power of 21 dBm. Utilizing a silicon area of 1.69 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , mounted on Roger's RO4000/FR4 PCB, the BPD-PA produces a maximum output power of more than 22 dBm for 2.4 GHz bandwidth with a minimum power gain of 15 dB. The corresponding peak power added efficiency (PAE) of more than 35% is achieved across the operating bandwidth. The fabricated BPD-PA meets the Adjacent Channel Leakage Ratio (ACLR) specification of -30 dBc at a maximum linear output power of 21 dBm (3 dB back-off from maximum output power) when tested with 20 MHz LTE signal at 1.7 GHz.
Highlights
Modern communication systems are concentrating on achieving higher data rates transmission at flexible frequencies while achieving high efficiency without trading off stringent linearity requirement of the communication protocols; i.e; LTE, NB-IoT
This paper proposes a Broadband-Pre-Distorter (BPD) linearization mechanism that extends the linear operating bandwidth of a Complementary metal oxide semiconductor (CMOS) power amplifier (PA) with a minimum trade-off with its Power-Added-Efficiency (PAE)
A broadband BROADBAND-PRE-DISTORTER-POWER AMPLIFIER (BPD-PA) operating from 400 MHz to 2.8 GHz has been proposed
Summary
Modern communication systems are concentrating on achieving higher data rates transmission at flexible frequencies while achieving high efficiency without trading off stringent linearity requirement of the communication protocols; i.e; LTE, NB-IoT.
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