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peak-to-peak output voltage of HMC659LC5

Question asked by katsu on Aug 27, 2015
Latest reply on Sep 11, 2015 by katsu



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.


Best Regards,