Hello,
I am using a RF switch ADRF5020 in a RF module, and we are suffering some failures in this switch.
Attached to this message there is an schematic of the switch.
The supply voltages (+5V and -5V) are provided by a power supply with two channels. We use a laboratory power supply and we have measured the delay between voltages with an oscilloscope. We have measured that positive supply
Reading again the datasheet of the component, I have found the following comment "Power up VDD and VSS. Powering up VSS after VDD avoids current transients on VDD during ramp up". This is a bit strange for me,as I am used with amplifiers to power up the negative voltage before the positive voltage.
Could anyone confirm that in this component is better to provide postive voltage before negative voltage?
As the CTRL signal is provided by VDD, this control signal is supplied at the same time that the positive voltage, and I don't know if this could be a problem. The enable signal is open circuit, maybe a pull down resistor would be a good idea.
When the switch is broken, we notice that the current in the Vss port increase, and as we provide the Vss=-2.5V through a voltage divider from -5V with to resistors, the voltage in the Vss pin goes to 0 Volt.
We would appreciate any recommendation to solve this problem. Thanks
Thanks.
Best regards,
Ignacio
