Analysis and Design of Helix-on-Pads for Miniaturized Mobile Applications
A 0.15.0 GHz 65 nm CMOS recongurable transmitter for private network wireless communications is presented. The transmitter integrates a 0.11.5 GHz high-efciency dual-mode power amplier to support low-cost narrowband applications and a 0.455.0 GHz efciency-optimized pre-power amplier to support high-performance wideband applications. A wideband PLL frequency synthesizer, DACs with recongurable sampling rate and the recongurable digital baseband processing with standard JESD207 interface are all included to implement the highly-integrated transmitter. Specically, with the proposed digitally-assisted self-calibration technique for LO leakage and image rejection, the transmitter achieves 52 dBc LO leakage and 53 dBc image rejection ratio (IRR), showing 20 dB and 30 dB improvement compared with the un-calibrated cases, respectively. The system verications have demonstrated an EVM of 1.7% for 905 MHz EDGE with 19.5 dBm output power, and an EVM of 3.2% for LTE Band42 with 5.5 dBm output power. This proposed transmitter has achieved the comparable or even better performance in linearity, noise oor and power consumption compared with the state-of-the-art recongurable transmitters. Index TermsC-IM3, CMOS, digitally-assisted self-calibration, dual-mode power amplier, private network wireless communications, recongurable, wireless transmitter.