Interference Suppressing Super-regenerative UWB Reader Demodulator with Minimal Tuning

سال انتشار: 1398
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 473

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شناسه ملی سند علمی:

ICMCONF01_034

تاریخ نمایه سازی: 19 اسفند 1398

چکیده مقاله:

In this paper, a super-regenerative receiver (SRR), which is one of the practical ways to receive UWB narrow pulses with much less jitter sensitivity, is designed. Inevitably, to minimize the unwanted signal energy loss, n-path notch filters with high Q factor have to be utilized in order to cancel out the interference signal in high frequencies. However, in this case, so many challenges may appear, since n-phase tunable local oscillator signals have to be generated to adjust the center frequency of the notch filter, which in turns results in complexity and high power consumption. In this design, after going through the ultra-wideband LNA, by using a down-conversion mixer, all the operations is done in lower frequencies. By this way and by properly choosing the LO signal frequency equal to the interference center frequency, controlled by an injection locking oscillator, the interference center frequency converts to a dc level and can be canceled out by using a simple low-power gm-C high-pass filter with high Q factor, in such a way that system can tolerate in-band interference as large as 8dBm/MHz. The quench signal and the received pulse in the super-regenerative oscillator used in such systems need to be synchronized to maximize the gain, and in this design a synchronization loop is employed. in the proposed solution, the null frequency is fixed and down-conversion may lead to an asymmetric overlap of the spectrum around the interference frequency, which in some cases can degrade the received signal energy. But according to the simulations, the operation of the proposed energy-detection system is not interfered and the overall accuracy is enough to position the tag location along with the simply-designed tags and low-power simple gm-C high-pass filter. The proposed system is designed and simulated in 180 nm CMOS technology, while consuming 28 mW power under 1.8 V supply.

نویسندگان

R. Sattari

Department of Electrical Engineering Sharif university Tehran, Iran

Ali Fotowat Ahmadi

Department of Electrical Engineering Sharif university Tehran, Iran