fpga4fun.com

by **eman** » Mon Mar 23, 2009 8:16 am

Hello,

I dont know if others had similar situation with example RC Servo code.

In my case it does not poduce square waves , just at the beggining of period it creates short pulse and ends the PW with a negative pulse.

is something wrong with Pluto 3 boards ?

I tried different parameters but the output is always distorted.

Can Pluto III boards produce pulses al short as 0.7 - 2.2 ms ?

by **eman** » Wed Mar 25, 2009 5:56 am

If others may got this situation: The problem was small patch of wire I used in between probe and pin. Its capacitance caused the attenuation.

Thanks to Jean from knjn and others for suggestions and support.

by **Thoma HAUC** » Fri Mar 27, 2009 7:00 pm

Hi eman,

Your signal seems to be a derivate of a square signal. Electrically, this means that between the fpga output and your measurement point you have a probably unwanted capacitor (bad soldering or bad contact for example).

Hope this help

Thoma

by **eman** » Mon Mar 30, 2009 2:29 pm

Thoma HAUC wrote:Hi eman,

Your signal seems to be a derivate of a square signal. Electrically, this means that between the fpga output and your measurement point you have a probably unwanted capacitor (bad soldering or bad contact for example).

Hope this help

Thoma

Thoma, that is correct -> the connected wire had bad contact.