peak-to-peak output voltage of HMC659LC5

Question

Hello, 
 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,

ADIApproved · Accepted Answer

With different circuit typologies you can get higher output swing than the Vds. 
 One way of doing that is getting help from internal and external inductors, like choke inductors. 
 For instance, HMC5879 is a narrowband PA with completely different circuit architecture, but it can provide 40 Vpp output swing by using only 7-9 Vds. 
 Best, 
 Kagan)

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peak-to-peak output voltage of HMC659LC5