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Testing with the vsa

The VSA is an instrument capable of demodulating digital signals. You may use the VSA to demodulate your FSK signaland display the symbols received.

Configuring the vsa

The VSA is the big HP unit on a cart in the front of the classroom. Plug the output from the DSP board into the"Channel 1" jack on the front of the vector signal analyzer, and then turn on the analyzer and follow theseinstructions to display your output:

After powering the signal analyzer up, the display will not be in the correct mode. Use the following sequence ofkeypresses to set it up properly:

If this doesn't work, hit "Save/Recall," F7 (Catalog), point at ECE320.STA with the wheel, and hit F5 (Recall State) and F1 (Enter).
  • "Freq" button, followed by F1 (center), 11.025 (on the keypad), and F3 (KHz)
  • F2 (span), 22, and F3 (KHz)
  • "Range," then F5 (ch1 autorange up/down)
  • "Instrument Mode," then F3 (demodulation)

Viewing the signal spectrum on the vsa

The VSA is also capable of displaying the spectrum of a signal. Hook up the output of your PN generator to theVSA and set it up properly to view the spectrum of the random sequence. Hit "Instrument Mode" and then F1(Scalar) to see the spectrum. Note that you can also use your Lab 4 code for this purpose.

Does what you see match the Matlab simulations?

Optimization

One purpose of this lab is to teach optimization and efficient code techniques. For this reason, for your labgrade you will be judged primarily on the total execution time of your system. You are not required to optimize memory use. Note that by executiontime we mean cycle count, not the number of instructions in your program. Remember that several of the TMS320C54xxinstructions take more than one cycle. The multicycle instructions are primarily the multi-word instructions,including instructions that take immediates, like stm , and instructions using direct addressing of memory (such as ld *(temp),A ). Branch and repeat statements also require several cycles to execute.Most C instructions take more than one cycle. The debugger can be used to determine the exact number of cycles used byyour code; ask your TA to demonstrate. However, since the number of execution cycles used by an instruction is usuallydetermined by the number of words in its encoding, the easiest way to estimate the number of cycles used by yourcode is to count the number of instruction words in the .lst file or the disassembly window in the debugger.

We will grade you based on the number of cycles used between the return from the WAITDATA call and the arrival at the next WAITDATA call in assembly, or the return from one WaitAudio call and the arrival at thenext WaitAudio call in C. If the number of cycles between the two points is variable, the maximum possible number ofcycles will be counted. You must use the core.asm file in v:\ece320\54x\dsplib\core.asm or the C core file in v:\ece320\54x\dspclib\core.asm as provided by the TAs; these files may not be modified . You explicitly may not change the number of samples read and written by each WAITDATA or WaitAudio call! We reserve the right to test your code by substituting the test vector corefile.

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Ece 320 spring 2004. OpenStax CNX. Aug 24, 2004 Download for free at http://cnx.org/content/col10225/1.12
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