RF Report - EEL 6374 Radio Frequency Circuits and Systems 1...

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EEL 6374 Radio Frequency Circuits and Systems 1 Gbps WLAN RF System Design and Simulation Instructor: Dr. Jenshan Lin Students: Hongzhi Sun, Mingche Li, Xiaogang Yu Team No.: 2
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1. Introduction In this project, a WLAN system with data rate up to 1 Gbit/s was configured by ADS. The unlicensed band of 56-64 GHz was chosen as the carrier frequency due to its wide bandwidth and free virtual interference. The operating distance can be as far as 100m, with bit error rate better than 1×10 -6 . The simulation results of this transceiver shows a good performance. 2. Design Insight 2.1 Transceiver Architecture For WLAN transceiver, the ease of operation and the simplicity of the system are among the most important figures of consideration. Thus the direct conversion architecture was applied in our design, as shown in Figure 1. Its advantage is high integration, because it eliminates image-reject and IF filters, while the cost is the problem caused by DC offset. In our system, the data rate is as high as 1 Gbps, so the interference coming from DC is not so severe. The modulation/demodulation method of our design is QPSK, because it is easier to implement. The disadvantage compared with other type of modulation/demodulation such as QAM 16 or QAM 64 is the wider bandwidth. It is not a problem in the band of 57-64 GHz, since the allowed bandwidth is 7 GHz while that in need is only 1 GHz. Most of our RF components are commercial except mixer, which was published by
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Berkeley. The parameters of each component have been listed in Table 1. LNA Mixer PA IF AMP Model UMS_CHA2159 Published[1] UMS_CHA2109 AHB110 Frequency 55 – 65 GHz 60 GHz 55 – 65 GHz 40MHz-1GHz Gain 20 dB -2 dB 20 dB 28 dB Noise Figure 4.0 dB 2 dB 4.0 dB 4.5 dB P1 dB 15 dBm -5.5 dBm 15 dBm 12 dBm IP3 25 dBm 2 4.5 dBm 25 dBm 2 22 dBm Table 1 Parameters of RF Components BPF Mixer Mixer LPF LPF IF Amp IF Amp ADC ADC I Q LNA PA Mixer Mixer Amp Amp LPF LPF DAC DAC I Q VCO 15 GHz 90 Figure 1 Architecture of Direct-Conversion Transceiver
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2.2 Frequency and Bandwidth Since we choose QPSK as modulation/demodulation method, each symbol represents two bits. Thus the bandwidth should be 1 GHz. It is impossible to get such a wide bandwidth at lower unlicensed bands that are currently used, such as 2.4 GHz and 5 GHz. We choose 60GHz as carrier frequency. We could benefit from this choice from
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This note was uploaded on 03/31/2012 for the course ECE 101 taught by Professor X during the Spring '12 term at Florida A&M.

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RF Report - EEL 6374 Radio Frequency Circuits and Systems 1...

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