Project overview. Card Spec’s. Hardware:

◦ Block Diagram of the Card.◦ Circuit diagram of the card.

Interface between the Analog card and the DE2. Software: DE2 functions

What is in the lab today?closed lab experiment consisting of only an 12 bit A/D and

a sample and hold.

What are the new features in our project? 8 bit A/D converter (less sensitive to digital noise) D/A converter. DE2 board

Our card will allow the students to process the digital signal and observe its effects on the reconstructed signal.

Design and produce a Prototype card that has on it:1. a sampler (plus an A/D) 2. a reconstructing unit (D/A).

External digital signal processing using the DE2 card.

Protect the card from users accidentally damaging it.

Design of a board for the new laboratory experiment in analog to digital conversion (ADC).

-10 volt reference voltage for ADC

5 volt voltage regulator+15 volt voltage regulator

-15 volt voltage regulator

8 bit digital signal

Buffers & interface

with DE2 or Logic

Analyzer

DE2 / Logic Analyzer

8 bit digital signalAnalog Input

Over voltage

protection+/- 10V

Sample & Hold

Bipolar to Unipolar converter

Unipolar / BipolarSwitch

SampleSwitch ADC

Over voltage

protection0 to +10V

DACUnipolar /

BipolaroutputSwitch

Unipolar to Bipolar

converter

Analog Output

Sort circuit protection

Clock Input

Over voltage

protection0 to +5V

Clock

nBusy

LogicClock’

8 bit digital signalAnalog Input

Over voltage

protection+/- 10V

Sample & Hold

Bipolar to Unipolar converter

Unipolar / BipolarSwitch

SampleSwitch ADC

Over voltage

protection0 to +10V

Opcode (supplied directly to the DE2 by user):◦ 8 bit – will determine the signal processing that is applied on the digital input.

Input:◦ 8 bit digital input from the card of the sampled and converted input signal.

Output:◦ 8 bit digital output of the processed signal to the card.

Data ready signal:◦ Card Clock’ is input into the DE2 from the card and acts as a signal telling the DE2 when the input is valid.

Clock output:◦ This feature allows the DE2 to control the DAC

rate of conversion.

Analog card

Register level DE2 inputs

DE2 outputs

סכימה גלובלית

קצת על הכרטיס

LEDs

switches

Buttons

FPGA

Power Supply

USB Blaster Clock

(27 MHz)Expansion Header

דיאגרמת בלוקים

פונקציות שמומשו על הכרטיס

Div by 2

saturateDelay

(pass the signal)

First-order hold

0 100 200 300 400 500 600 700 800 900 1000

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

input

output

0 100 200 300 400 500 600 700 800 900 1000

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

input

output

0 100 200 300 400 500 600 700 800 900 1000

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

input

output

Div by 2Delay (pass the signal)saturate

0 100 200 300 400 500 600 700 800 900 1000

-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

input

output

First-order hold

כניסות ויציאות של הכרטיס

interface

:כניסות לכרטיסInput data: 8 bitsControl from the card : 2 bitsInput control : 1 bit (unipolar / bipolar)

יציאות מהכרטיס : Output data: 8 bitsControl : 1bit (unipolar / bipolar)Clk : 1 bit (27 MHz)

ספציפיקציות

Inputs and outputs specifications : 3.3 -V LVTTL

Provided voltage : 5 V and 3.3 V

: הכרטיס נבדק ע"י התוכנות הבאות Quartus 7.2Modelsim 5.8b

ניצול משאבי הכרטיס(quartus results)

Logic elements : 388/33216 (1 %)

Registers : 128/33216 ( <1 %)

Total pins : 48/475 ( 10% )

Total Memory bits : 4096/483840 (< 1% )

DSP 9x9 : 0/70 ( 0%)

PLLs : 0/4 ( 0% )

כמו להרוג זבוב בעזרת טיל

שאלות

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