# Help with Circuit

Discussion in 'Homework Help' started by sheheryar_noor, Jun 3, 2010.

1. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
Hi everyone i got project from someone

Here is the Project
Code ( (Unknown Language)):
1. www.stanford.edu/class/ee122/Spice_Decks/pspicedemo.pdf
And i did the same what the pdf file tells

Here yall can see the video which i made

Code ( (Unknown Language)):
1. http://rapidshare.com/files/390247187/CaptureWiz005.wmv
Or

Code ( (Unknown Language)):
But rapidhsare one's quality is good

Circuit Pic

The graph which i want to invert

Can someone help me with inverting the graph?
What should i add in the circuit to invert the graph?

2. ### Jony130 AAC Fanatic!

Feb 17, 2009
4,167
1,188
OMG
Spice AC analysis don't show "minus" sing.
You must use phase marker or transient analysis to see that signal is invert.

3. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
Bro actually i am not a student of Electronics
It is a project of my friend
He is in the hospital so i am doing it for him
I am very new to this thing
I didn't get u
Can u explain me what should i do to invert the graph?Or move it from down to top?
My graph moves from top to down how can i change it to move it from down to top?

4. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
Ok ... how do you invert any number?

Since this is a homework assignment, I'm sure the professors can do whatever they wish and not make a lick of sense, so they must be checking to see if you know how to invert a number.

Then you can add any bias you wish to make the scale whatever.

5. ### Eng_Bandar Active Member

Feb 27, 2010
50
1
you want invert gragh from what to what ?

6. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
From my understanding, they want to invert the sweep ... something like the attached.

I applaud his efforts in helping his friend.

File size:
16.5 KB
Views:
15
7. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
Look at this Pic it is a graph of Vout
It moves from 2.0V to 1.0MHZ means from top to bottom
And i want it to move it from down to top
Here the pic is

8. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
What did the instructor say for this assignment .... you never answered that question.

I imagine this is what you want ....

• ###### BS3.PNG
File size:
17.1 KB
Views:
24
Last edited: Jun 4, 2010
9. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
Joe how did u do that?
Can u tell me please
how did u change the graph?

10. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
go back and look at my last graphic ....

The guessing game is over. You need to specify what the professor wanted, not in your terms, but in the terms the professor used.

This is my last post until the requirement above is met.

As far as what I did, it's written right there on each graph.

11. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
Joe thanks 4 keep replying
i was in the hospital with him
His friends just draw red lines on ur screenshots to give me a clue
Look at these red lines i want graph like these red lines

And i hope that guessing game is over

Is it enough or i should get something more to make u understand?

Thanks again

Let me know if u can make like these Ok

Last edited: Jun 5, 2010
12. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
The problem is the original circuit is a low pass filter. You originally stated you wanted it inverted, which could mean the objective was to make it a high pass filter (my last graph).

So far, you've gotten opinions from your friend and his friends ... yet not one word from what the professor stated or a hint and what the professor was seeking with the exercise.

In your first picture ... the student had a lower output high pass filter than I did. That may be well and good, but losing 10 dB might not be what the professor had in mind.

In your second picture, the student had a bandpass (cutting off both the low frequencies and high frequencies) filter. Again, this may not be what the professor had in mind and it does not fit your description of inverted.

You are a good friend to take on this tasking. Why can't you approach the professor and see what they wanted?

13. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
Correct i must ask the professor
And Thanks alot
Can u make both of them?I hope u can coz u got everything from the graph
I will ask the professor

14. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
what should i ask professor? That if he wants High pass filter and how much db he wants to lose?
Or what should i ask?

15. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
Tell him the whole story of you assisting your friend ... and your here to clear up what you described as "inverted" to this forum, including how you came up with the "inverted" line.

16. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
i will ask him if he needs high pass filter and how much db wants to lose?
or i shud ask something more too?
or u want me to ask him what do u want?

17. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
Your the one talking with the professor.

18. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
yup i will be the one to ask professor
Tell me what should i ask which can make u understand easily and clearly?

19. ### JoeJester AAC Fanatic!

Apr 26, 2005
3,660
1,520
clear up what was meant when you said ... invert graph.

20. ### sheheryar_noor Thread Starter Member

May 22, 2010
32
0
O.K i will ask Sir what did u mean by inverting the graph?