Digital output LabVIEW FPGA

[pnik95]

Hi,

With MyRIO, I want two digital outputs (signals that are mutually inverted because I want to get a larger amplitude). generate 4 pulses with a frequency of 25 KHz every 10 ms. I ordered the program from the picture below. When I look at the digital outputs, I see some transient phenomenon - a peak before the start. maybe who knows why it happened?

thanks

Domen

 

 

 

[santo_13]

Maybe overshoot due to fast rise time and load being high-impedance.

Try enabling bandwidth limit on the scope to 20MHz to confirm this assumption.

[pnik95]

First of all thanks for the quick reply.

set the bandwidth to 20MHz, but the spike still appears. The peak frequency is approximately 6 MHz (picture in the attachment). The spike appears at the input even if I do not connect any load.

 

  

  

I

[BigApple0]

Try breaking up the diagram into simple steps.  I have an example below.

[BigApple0]

[Bob_Schor]

Sounds like it may be "faulty design".  If I needed, say, a 10 V "digital pulse" signal, I don't think I'd hook up two TTL Outputs (5 V) and expect to see them peacefully sum (but I'm not an Engineer, electrical or otherwise).  Sounds like a "one-transistor Amplifier" circuit might be needed, to be driven by a single TTL output.  And, of course, you should have an appropriate load included in the circuit.

Bob Schor