University : Northumbria University UniLearnO is not sponsored or endorsed by this college or university.
Subject Code : EN0720
Assignment Task :

Assignment 2 - Modelling and Simulation of XADC input circuitry using the SMASH® mixed-signal simulator Useful sources of information 

• '7 Series FPGAs and Zyng-7000 All Programmable SOC XADC Dual 12-Bit 1 MSPS Analog-to-Digital Converter User Guide' - document 'ug480_7Series_XADC.pdf XAPP95

 

Input

 


 

 

 

Figure 2.1 - XADC input equivalent circuitry 

Figure 2.1 shows the equivalent circuitry of the Xilinx 7-series FPGA Analogue-to-Digital Converter (XADC) auxiliary inputs. The circuitry enclosed inside the dotted box is integral to the FPGA device, the terminal labelled 'VA1' represents an auxiliary input VAUXP (VAUXN' is assumed to be at ground potential). The components labelled 'XSW1..3 (XADC_SW) are analogue switches controlled by digital signals 'cap_sample' and 'cap_reset'. When the XADC is acquiring a new sample value, 'cap sample' is at logic-1 and switches XSW1 and XSW2 are closed, the signal 'cap_reset' is at logic-0 and switch XSW3 is open. The storage capacitance Xcap' charges up to the current input voltage during the time interval known as the acquisition-time 'Tacqu'. 

Once the storage capacitor charges up to the sample voltage, all switches are opened and the voltage across Xcap' is held constant while the analogue-to-digital process takes place during the 'hold' time 'Thold'. At the end of the hold-time, the storage capacitor is discharged to zero volts by closing switch 'XSW3'. The sequence repeats at intervals of time known as the sample-time 'Tsample'. 

 

 

This  EN0720 :Engineering Assignment has been solved by our Engineering Experts at UniLearnO. Our Assignment Writing Experts are efficient to provide a fresh solution to this question. We are serving more than 10000+ Students in Australia, UK & US by helping them to score HD in their academics. Our Experts are well trained to follow all marking rubrics & referencing style.

Be it a used or new solution, the quality of the work submitted by our assignment experts remains unhampered. You may continue to expect the same or even better quality with the used and new assignment solution files respectively. There’s one thing to be noticed that you could choose one between the two and acquire an HD either way. You could choose a new assignment solution file to get yourself an exclusive, plagiarism (with free Turnitin file), expert quality assignment or order an old solution file that was considered worthy of the highest distinction.

Eureka! You've stumped our genius minds (for now)! This exciting new question has our experts buzzing with curiosity. We can't wait to craft a fresh solution just for you!

  • Uploaded By : Pearl
  • Posted on : January 07th, 2019

Whatsapp Tap to ChatGet instant assistance