Design Of The Mixers For Multi-Mode Multi-Band Wireless Receiver

With the rapid development of Mobile Communication technology, Local Area Network (LAN) communication technology, and Automatic Identification technology, people's demand for wireless communication is far from staying in the single-mode, single-frequency applications, but continuously going ahead towards the direction of multi-network convergence to realize the truly achievement of free, fast, easy communication.In this dissertation, a chip of mixers applied in the multi-mode, multi-band wireless receiver is designed and fabricated in 0.13μm CMOS process. The chip can support these four standards of GSM (the second generation mobile communication), TD-SCDMA (the third generation mobile communication), RFID (key technology of the internet of things), and WLAN 802.11a (wireless LAN) simultaneously. The main achievements are shown as follows:(1) After a detailed analysis of the advantages and disadvantages of the three typical receiver configuration, combining with the key features and parameters of GSM, TD-SCDMA, RFID, WLAN 802.11a/b/g standards, an optimal direct conversion receiver system supporting these four standards is proposed, and the design specifications of the mixers are given through the system simulation.(2) A 0.8-2.1GHz wideband Inphase/Quadrature passive down-mixer which can support GSM/TD-SCDMA/RFID simultaneously is proposed. The mixer adopts the transconductance-switching-transimpedance three-stage configuration; besides it, a 5-6GHz narrow-band Inphase/Quadrature active down-mixer for WLAN 802.11a standard is also been designed. Based on the modified Gilbert mixer and the folded architecture, the down-mixer realizes the trade-off among conversion gain, noise figure and linearity successfully.(3) Verifications of the chip are performed, including the layout design, the post simulation of the different performance parameters and the preliminary measurement of the chip. The simulation results are shown as follows:for the wide-band down-mixer across the whole band, the conversion gain is not less than 5dB, the noise figure is not more than 16dB, and the input third-order intercept point IIP3 is about 5dBm; for the narrow-band down-mixer, the conversion gain, noise figure and input third-order intercept point IIP3 are lOdB,13.89dB,-3dBV respectively. The existing measurement results give a further verification of the correctness of the theoretical analysis and the simulation results, and show us the great guiding significance to the future work.This dissertation's work is supported by project "Key IP cores design for the embedded multi-mode multi-band transceiver" under the state key item of "core electronic devices, high-end general chips and basic software product" (Project number:2009ZX01034-002-002-001-02).