Two 180nm CMOS wireless transceivers for IoT applications

Two fully integrated reconfigurable transceivers (TRX) in 180nm CMOS for 750-930MHz short range wireless communication are presented. The narrowband Sub-GHz TRX consists of a low-IF receiver with 180 kHz signal bandwidth, a mixed-signal polar transmitter with 3.75 kHz signal bandwidth and a fractional-N frequency synthesizer. The RX achieves 4.01dB NF, 48dB IRR and 5~65dB dynamic range. The DPA provides 23.2dBm maximum saturation power with 44.5% PAE. Moreover, TX system verifications demonstrate 3.87% EVM for 891MHz π/4-DQPSK signals at 18.87dBm output power with - 40dBc out-of-band rejection. The Sub-GHz TRX for 802.11ah applications is composed of a Low-IF/Zero-IF reconfigurable receiver, a transmitter with PAPR-tolerant PA and a Σ-Δ fractional-N PLL with Class-C VCO. The RX achieves 4dB NF and consumes 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).