Publication: High speed analog to digital converter (adc) for wireless
Loading...
Date
2008-04-01
Authors
Nadzri, Nor Shakirina
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Analog-to-digital converter (ADC) is an essential element in wireless receiver. ADCs are used to convert analog signals to the digital domain. Depending on the location of the ADC in the receiver chain, different architectures of receivers are discussed; super heterodyne, homodyne, image reject, software radio and software defined radio, all of which have different advantages and drawbacks. The purposes of using high speed ADCs are because they offer the lowest power consumption and highest AC performance in the industry. In this project, ADS 5474 from the Texas Instrument, a 14 bit, 400 MSPS analog to digital converter (ADC) with the structure of pipeline ADC is used. This ADC has total power dissipation of 2.5 W and has ability to operate from 5V and 3.3V supply while providing low voltage differential signaling (LVDS) compatible digital outputs. The output data are available as a 14-bit parallel word which coded in binary format. The layout of the ADC schematic is designed using the OrCAD 9.2 software with six layers. It then should be fabricated on the printed circuit board (PCB). Due to some problems, the ADS 5474 evaluation board is used. The evaluation board is tested to evaluate the analog-to-digital converter under various signal, reference and supply conditions. The ADC evaluation board is tested together with the DAC evaluation board to generate final output using the oscilloscope. Finally, the test results are discussed. This ADC is applicable for software defined radio application and communication instrumentation.