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SN74LVC3G17: Ringing during switching at high frequency

deepak naiknavare
Prodigy 140 points
Part Number: SN74LVC3G17

We are using SN74LVC3G17 as driver for optical transmitter. The current is almost 24mA each channel.

During Switcting we observe a ringing upto 1V. 

Could there be any method to improve the signal integrity at high frequency.

Below is the Waveform:

CH1: Input from the Function Generator

CH2: Input to the SN74LVC3G17

CH3: Output of SN74LVC3G17 (Sink current 24mA each channel)

CH4: Optical receiver output

  • 0
    TI__Mastermind 20545 points

    Hi Deepak,

    Can you send me a schematic of your circuit? Specifically I want to see what the load is. 

    Are you also able to send a more zoomed in scope shot of this?

  • 0 in reply to Albert Xu1
    Prodigy 140 points

    Thanks for response.

    Above is the snap of the schematic which shows the load being driven by the buffer- HFBR-1414TMZ.

    Below is the zoom Version

    CH1: Input from the Function Generator

    CH2: Output of the SN74LVC3G17 (Ripple of 1V)

    CH3: Cathode of HFBR-1412TMZ

    CH4: Optical receiver output

    i can send you the actual documents over email if they are not clearly visible here

    Regards,

    Deepak

  • 0 in reply to deepak naiknavare
    TI__Mastermind 20545 points

    Hi Deepak, 

    Try adding some capacitance to ground at TP30, 31, 32. This will slow down the the rising edge on the drivers which should smooth out the input to HFBR-1412TMZ and eliminate the overshoot. 15 pF may be a good starting point and you can increase it to see if the signal will react better. 70 pF is about the max I would recommend.