题目/Title：A Sub-GHz low-power transceiver with PAPR-tolerant power amplifier for 802.11ah applications

作者/Author：俞小宝,魏蒙,殷韵,池保勇,王志华
                        Xiaobao Yu,Meng Wei,Yun Yin,Baoyong Chi,Zhihua Wang

会议/Conference：RFIC 2015

地点/Location：Phoenix, Arizona

年份/Issue Date：2015.17-19 May

页码/pages：pp. 231 - 234

摘要/Abstract：
A fully-integrated Sub-GHz low-power transceiver (TRX) for 802.11ah applications is presented. The receiver takes both advantages of Low-IF/Zero-IF architectures while supporting 1/2/8MHz reconfigurable signal bandwidth. A Σ-Δ fractional-N PLL with Class-C VCO is employed to provide the LOs. In order to enhance the power amplifier (PA) backoff efficiency, a Peak-to-Average-Power-Ratio (PAPR) tolerant technique is proposed with the aid of a power control loop to dynamically detect the input signal PAPR and flexibly reconfigures the PA’s operation modes. With digitallyassisted self-calibrations for LO leakage and image rejection, the transmitter obtains -51.6dBc LO leakage and 51.2dBc image rejection ratio (IRR). A JESD207 interface is also included to communicate with the digital baseband. Implemented in 180nm CMOS, the receiver achieves 4dB NF and dissipates 18.9mW from a 1.7V supply. The CMOS PA achieves 13.6dBm output P1dB with 25.5% PAE in high power mode (HPM) and ×2.61 PAE improvement at 7dB back-off power in low power mode (LPM).