Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

who ever did pwm chip with fpga

Status
Not open for further replies.
You can use an adder to implement PWM function and the carry of msb will be the final output.
 

PWM is pulse width modulation. It work by counter. So, u can design it via counter or timer.
If u need, I may exchange it with u
 

If you use timer or counter , the pulse is like __________
|
|
|__________,
if adder , you will get ___ ___
| | | |
| | | |
| | | |
____| |___| |____ .................

Depends on your choice.
 

Sorry , the previous one's position
is shifted, So I redraw it.
__________
|
|
|__________,
if adder , you will get
___ ___
| | | |
| | | |
| | | |
____| |___| |____ ............
 

? Your drawings doesn't make much sense, please explain or redraw.
 

Sorry , blank was omitted so my drawing doesn't make sense.

If you interpolate 16 levels in one PWM time and assume the current signal amplitude is 0.5 ,
the timer or counter result will like :

1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0,

the adder result will like :

0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1.

So it depends on your requirement.
 

who ever did pwm chip with fpga

Hi cyteng,
I agree that both way will produce a pulse width modulation but the first choice is, as far as I know, the one that is mostly used.

junchaoguo51888,
go to xilinx web site and search for PWM. They published a paper some time ago (you can get the vhdl code too) which is basic but might help you.

take care.
 

I've done a little about PWM with FPGA,I've used counter and the result is satisfying.While I have no idea of the second choice which is provided by cyteng,
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top