Design of High-Gain Low Noise Amplifier with Interference Rejection for UWB Systems

Autor: Yi-Han Wu, 吳(日+羽)涵
Rok vydání: 2013
Druh dokumentu: 學位論文 ; thesis
Popis: 101
This thesis is focused on the research of high-gain low noise amplifer (LNA) with interference rejection for ultra-wideband (UWB) systems. UWB communication systems are operated at frequency band from 3.1 to 10.6 GHz with very low transmit power. Within UWB band, signals from IEEE 802.11a frequency 5.725 - 5.825 GHz overlaps and is larger than the transmitter power of UWB systems. Such signals are called in-band interference. To avoid signals from wireless local area network (WLAN) systems as UWB receiver interference, a high-gain UWB LNA combines with 5.8 GHz notch filter is presented to reject in-band interference. For extending the bandwidth with a considerably gain flatness, the proposed UWB LNA uses the stagger tuning technique of two stages with different resonant frequencies. The notch filter with extremely high quality factor provides high rejection ratio to eliminate the in-band interference from nearby WLAN systems. The center frequency of notch filter and interference rejection ratio can be adjusted by changing the biasing current. The characteristic curves is independently adjusted without affecting the LNA itself. The proposed circuit was simulated by Agilent ADS 2009U1 with 0.18 um TSMC CMOS process technology. Electromagnetic simulation is verified by the post-layout simulation. The maximum power gain is 15.43 dB and the minimum noise figure is 4.36 dB with full bandwidth of 3.1 - 10.6 GHz. The input reflection coefficient S11 and the output reflection coefficient S22 are both less than -10 dB. The maximum interference rejection ratio (IRR) is over 44.7 dB at 5.83 GHz of interference. The supply voltage is 1.8V and the power consumption is 20.3 mW. The chip size including I/O pads for further measurement is 0.877×0.985mm2.
Databáze: Networked Digital Library of Theses & Dissertations
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