Monday, 1 June 2015

switches - Fast analog switch overshoot


The circuit purpose is to control square signal frequency from 100Hz to 1kHz (generated by MCU GPIO) and be able to control amplitude from 100mV to 2.3V. It is like a very simple signal generator. The goal is to keep edges <100ns. Switch is SN74LVC2G53. The schematic:


enter image description here


Problem: I get ringing on rising edge (ringing Frequency 3MHz), and on falling edge going negative about -600mV. enter image description here enter image description here Layout(i know it's bad, but i had no choice at this time. I will redesign the PCB later ): enter image description here



How can i reduce ringing on falling edge?




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