Graduate Thesis Or Dissertation
 

Design of high-speed low-power analog CMOS decision feedback equalizers

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  • Decision feedback equalizer (DFE) is an effective method to remove inter-symbol interference (ISI) from a disk-drive read channel. Analog IC implementations of DFE potentially offers higher speed, smaller die area, and lower power consumption when compared to their digital counterparts. Most of the available DFE equalizers were realized by using digital FIR filters preceded by a flash A/D converter. Both the FIR filter and flash A/D converter are the major contributers to the power dissipation. However, this project focuses on the analog IC implementations of the DFE to achieve high speed and low power consumption. In other words, this project gets intensively involved in the design of a large-input highly-linear voltage-to-current converter, the design of a high-speed low-power 6-bit comparator, and the design of a high-speed low-power 6-bit current-steering D/A converter. The design and layout for the proposed analog equalizer are carried out in a 1.2 pm n-well CMOS process. HSPICE simulations show that an analog DFE with 100 MHz clock frequency and 6-bit accuracy can be easily achieved. The power consumption for all the analog circuits is only about 24mW operating under a single 5V power supply.
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