I have a question on peak-to-peak output voltage of HMC659LC5.
Considering to use HMC659LC5 as optical modulator driver, applied 2.5Gbps 2.5Vpp to input port. About 9.6Vpp output is observed.
Condition: Vgg1=-0.75V, Vgg2=4V, Vdd=8V. Output AC coupling.
Why is output Vpp able to be greater than Vdd? I thought output Vpp cannot go greater than Vdd-GND.