Response to a Step Load Change
Posted: April 14th, 2011, 5:06 pm
I apply 3.3 volts to the wireless unit under test. As the unit is tested it changes many times from standby to recieve and to transmit. When stepping from standby to transmit the current will change from 50mA to 350 mA. When it does so the Keithley will drop from 3.3 volts to about 2 volts and stay that way for about 5 ms. This breaks the digital communication link to the unit causing a non-recoverable error. Do I have some configuration issue? I have set the compliance current to max. This is a 2420 so that's 3.15 A. I have also increased the decoupling capacitance but the drop out continues. Suggestions?