| Summary: | 碩士 === 國立成功大學 === 電腦與通信工程研究所 === 107 === 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.
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