I want to cascade 3 RF gain stages using ADL5611. I power each ADL5611 directly from a laboratory power supply of 5V. Individually each IC draws a current of 85-90mA. But when I power up two of them together the current reaches 400 mA(170mA expected). I have used a microstrip design on Arlon AD600 substrate and used a layout similar to the evaluation board. This combination occasionally works but mostly gives unexpected results. Can you kindly help resolve this issue?SMcBride
As you know, it's very hard to simulate the ADL5611 model but here is the screen shot of the dynamic voltage response (Yellow) and the current(Pink).
The circuit schematic is
The right side is to simulate the transient response from the ADL5611 block. There are complex RLC response after the supply voltage passes ~3V. Prior to this threshold voltage, ADL5611 behaves more or less like a resistive load. The complext RLC response is simulated using a voltage controlled switch to turn it on and off.