Recent content by Drao92

I will display the code. It makes me crazy, it works like a paranormal thing :D. The problem is the following. In RGB module in the always block if i say red<=x value, green <=y value etc it doesn't display anything, i must use an if-else statement to display anything. With the current code from...

If i don't put an if or else statement it doesn't display anything. Ill try to create another sync module. I think the one i use at this moment its buggy.

Hello, I have some problems with implementing a vga controller on a nexys 2 fpga board.The HV synchronization module works fine at first view, monitors says it displays the right resolution 640x480. The problem is that the RGB module doesn't display what i write to do. For exmple for the...

I want to ask 1 more thing. What is happening if i don't give a specific value to a pixel? its black by default? For exemple: if(x>30&&x<80&&y>30&&y<50) begin R=3b`111; G=3b`000; B=2b`00; end The pixels of the specified area in if statement will be red, but what is happening with the...

Hello, I have to make a Display module in verilog and first time i want to create a ball which is moving and i have a question, the vertial/horizontal synchronization module is done, the question is about displaying the image using RGB. So, i use 640x480 display and 25Mhz clock frequency and...

Iam talking about z transform and stability analysis. Like if H(z)=z/(z-1), pole is 1. is it stable? I have exam in 5 hours and i need an answer .

If a system transfer function has a pole equal with 1 , j, cos(pi/4)+j*sin(pi/4) in other words its location is on the margin of the unit circle, it`s the system stable? In my opinion it`s not stable because we have a sum of 1 which doesn't converge but I am not sure. Everywhere I've read it...

I think i found what what I am doing wrong. I made H(z)=3z/(3z-2) then i multiply by zn-1 and simplify by (3z-2) but i must simplify by (3z-2)/3 when calculating the residue... From now ill stick only to z-x form for denominator. Eveyrthing is clear now, thanks!

Homework Statement H(z)=1/(1-2/3*z-1) h(n)=? Homework Equations I tried to use the residue method to solve this problem but it doesn't give me the good result and i am not sure if i don't know how to use the method or this problem can't be solved using this method. Also, its pretty...

Thanks a lot!

Well, i got the idea. So if an increase in one of the input is droping the output it means it is inverting and if it increase the output it means it is non-inverting?

Hello everyone. I am studying internal structure of op amp and i don't know to solve some problems. The problem is that i have to specify and justify which inputs of the differential stage are inverting and non-inverting input and i don't know how to do it. I tried to find the answer on google...

Well, after doing this for the 3rd time my impedance is: (R3+R2)*(rbe+β*R5)/(rbe+β*R5+R2*β) which is actualy 3097 ohms which is close to The Electrician solution :D. Thanks for your effort. rbe is 1.25k becasue Ic3 is 2ma.

Ic2 is about 2ma or 1ma, i don't remeber exactly. And if the subcircuit is a constant current source its impedance is always infinite?

They are from exercise :), not random. VCC was 20v, low signal analysis. THis is the circuit. I made aproximations when i said its 5k,2.5k etc. Vin is on R1 and Vout on RL https://www.physicsforums.com/attachment.php?attachmentid=59047&stc=1&d=1369660820