A FSK/OOK Wake-up Receiver Using N-Path Filtering Techniques

Abstract

Nowadays there is an explosive growth of development in wireless communication applications such as IoTs (internet of things) or WSNs More and more sensor nodes are needed giving rise to diverse requirements and new techniques To meet the requirements of dense deployment of sensor nodes and good energy efficiency a low-power small-area and high-sensitivity wake-up receiver (WuRx) is expected to be implemented A WuRx continuously monitors the communication requests from transmitting nodes Only when receiving a request the WuRx wakes the main receiver up The main receiver remains asleep in the intervals of communication to optimize the power efficiency This thesis proposes a low-power OOK/FSK wake-up receiver using N-path technique for interference immunity and demodulation The ingenious design of the LNA and stacked mixer optimizes power consumption and alleviates the burden of local oscillator By the use of N-path filter rather than bulky external high-Q devices it can provide a high-Q band-pass response The N-path technique is also used in demodulator and aided by the gm-C filter to shift the center frequency Implemented in 90 nm CMOS process the WuRx operating in 433 MHz (ISM-band) with 100-kb/s input has a conversion gain before the demodulator of 65 dB and an expected sensitivity of ?100 dBm while consuming 200 μW under a 1-V supply voltage

Date of Award	2019
Original language	English
Supervisor	Kuang-Wei Cheng (Supervisor)