I need to use the HMC849ALP4CE with a bipolar (<+/-1V), non-AC coupled signal at the RFC terminal and a non ac coupled termination resistor at RF1. To accomplish this I would like to bias the ground terminals of the device below system ground so that device ground is at -2.5V and device Vdd=+2.5V. I'm wondering if the exposed pad is electrically connected inside the device or if that can still be connected to system ground while pins 10 & 11 are at -2.5V. Any issues with what I'm trying to do, obviously the -2.5V need to be pretty stiff (caps to ground) compared to ground to avoid isolation loss, etc. and of course the control voltages would need to be referenced to the -2.5V. Any change this would work reasonably at up to 6GHz?