Abstract
We present a new analog-to-digital converter (ADC)-based architecture of a phase-tracking receiver (PT-RX) optimized for ultra-low-power (ULP) and ultra-low-voltage (ULV) operations for the Internet of Things (IoT). The RX employs a type-II loop configuration that offers improved stability compared with the previous type-I PT-RX solutions. In addition, the type-II loop is also very tolerant of long run-lengths of consecutive “1” or “0” symbol sequences. Fabricated in 28-nm CMOS, the prototype PT-RX targets Bluetooth low energy (BLE) standard consuming only 1.5 mW at a supply of ≤0.7 V. It maintains an adjacent-channel rejection (ACR) of ≥-11/3.5/17/27 dB at 0/±1/±2/±3 MHz offset and can tolerate out-of-band (OOB) blockers of minimum -21 dBm across 1.0-3.5 GHz while also offering a best-in-class figure of merit (FoM) of 181 dB, with a 1-Mb/s BLE sensitivity of -93 dBm.
Highlights
T HE massive deployment of Internet-of-Things (IoT) applications calls for ultra-low-power (ULP) and ultralow-voltage (ULV) design techniques for system-on-chip (SoC) devices realized in nanoscale CMOS [1]–[4]
The filtered phase error LPF is limited by a one-bit quantizer, whose logic output is applied to a proportional–integral (PI) loop filter with programmable coefficients α and ρ that tune the digitally controlled oscillator (DCO) to track the RF input frequency
In contrast to the type-II phase-tracking RX (PT-RX), the low-frequency attenuation of signal TF (STF) in type-I PT-RX leads to the limitation of repetitive symbols
Summary
Suoping Hu , Graduate Student Member, IEEE, Jianglin Du, Student Member, IEEE, Peng Chen , Member, IEEE, Hieu Minh Nguyen, Student Member, IEEE, Philip Quinlan, Member, IEEE, Teerachot Siriburanon , Member, IEEE, and Robert Bogdan Staszewski , Fellow, IEEE. The RX employs a type-II loop configuration that offers improved stability compared with the previous type-I PT-RX solutions. The type-II loop is very tolerant of long run-lengths of consecutive “1” or “0” symbol sequences. Fabricated in 28-nm CMOS, the prototype PT-RX targets Bluetooth low energy (BLE) standard consuming only 1.5 mW at a supply of ≤0.7 V. It maintains an adjacent-channel rejection (ACR) of ≥−11/3.5/17/27 dB at 0/±1/±2/±3 MHz offset and can tolerate out-of-band (OOB) blockers of minimum −21 dBm across 1.0–3.5 GHz while offering a best-in-class figure of merit (FoM) of 181 dB, with a 1-Mb/s BLE sensitivity of −93 dBm
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