Abstract
A novel highly-efficient multi-band multi-mode all digital quadrature transmitter is presented. The all digital transmitter uses in-phase (I) codeword and quadrature (Q) codeword to control a switching-mode power amplifier (PA) or digital PA (DPA) consisting of in-phase PA (I-PA) and quadrature PA (Q-PA), where each of the power cells inside I-PA or Q-PA is either on or off. Due to the load interaction between I-PA and Q-PA, a 2-dimensional digital pre-distortion is applied to linearize DPA. The total transmitter is implemented in 40nm CMOS LP process and occupies a die area of 0.7mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The digital quadrature transmitter can support 20MHz, 40MHz, and 80MHz WiFi signals, Band 38 and Band 40 LTE signals with class 3 output power, and Bluetooth BDR, EDR2, and EDR3 signals.
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