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EECS 522 | Analog Integrated Circuits |
Bluetooth Radio Front-EndAbstract In this project, we plan to design a Bluetooth radio front end that we will use to demodulate an incoming bit stream and determine the BER for various SNR values at the antenna. Bluetooth was developed by Ericcson in 1994, providing 1Mbit/s data rates over a wireless link. Since then, new enhanced data rate (EDR) modulation schemes, including 8DPSK and π /4-DPSK, have increased the data rate to as much as 24 Mbit/s. Bluetooth was originally designed for devices that are relatively close to one-another, in low-bandwidth situations. This technology is able to connect up to 7 slave devices to a single master, and has been traditionally applied to low-data rate links, including voice streaming and limited file transfer. For our project, we will design an LNA, mixer, and gm-C filter to receive an incoming bitstream. The bitstream will be generated in MATLAB to match a bitstream modulated according to Bluetooth protocol, and will be fed to the LNA in Cadence. The LNA will be designed to match the input impedance of a 50+j0Ω antenna with at least 10dB of gain and a noise figure less than 3dB. The mixer will be a double-balanced Gilbert cell that will down convert to baseband. The mixer will be fed from an ideal LO, which would likely be implemented as on on-chip PLL. However, this will not be part of our design. Filtering will be done with a biquad gm-C filter, and this output will be fed into MATLAB to be demodulated. This MATLAB code will sumulate an ADC and a bitslicer, which will output the received bits. We will then determine the BER of this system for various SNR values at the input. Files |
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