A Fully-Integrated Reconfigurable Dual-Band Transceiver for Short Range Wireless Communications in 180 nm CMOS Xiaobao Y u, Meng Wei, Y un Yin, Ying Son g, Siyang Han, Qiongbing Liu, Zongmi ng Jin, Xiliang Liu

Abstract

A fully-integrated reconfigurable dual-band (760–960 MHz and 2.4–2.5 GHz) transceiver (TRX) for short ran ge wireless communications is presented. The TRX consists of two individ- ually-optimized RF front-ends for each band and one shared power-scalable analog baseband. The sub-GHz rec eiver has achieved the maximum 75 dBc 3rd-order harmonic rejection ratio (HRR3) by inserting a Q-enhanced notch filtering RF amplifier (RFA). In 2.4 GHz band, a single-ended-to- differential RFA with gain/phase imbalance compensati on is proposed in the receiver. A ΣΔ fractional-N PLL frequency synthesizer with two switchable Class-C VCOs is employed to provide the L Os. Moreover, the integrated multi-mode PAs ach ieve the output P1dB (OP1dB) of 16.3 dBm and 14.1 dBm with both 25% PAE for sub-GHz and 2.4 GHz bands, respectively. A power- control loop is proposed to detect the input signal PAPR in real-time and flexibly reconfigure the PA's operation modes to enhan ce the back-off efficiency. With this proposed technique, the PA E of the sub-GHz PA is improved by ×3.24 and ×1.41 at 9 dB and 3 dB ba ck-off powers, respectively, and the PAE of the 2.4 GHz PA is improved by ×2.17 at 6 dB back-off power. The presente d transceiver has achieved compa- rable or even better performance in terms of noise figure, HRR, OP1dB and power efficiency compared with the state-of-the-art.