# Question   : How to Calculate Rs and cutoff frequency at input side of AD8145 if i am using 3 positive clamp and 3 negative clamp diodes(1N4448) and termination Resistor RT = 120 ohms (Datasheet of AD8145, Page No 17 ,Figure 40. Using Two 1N4448 Diodes in

Question asked by tendulkar.selvam on Nov 4, 2016
Latest reply on Nov 22, 2016 by AnnaFeB

Dear All,

Application :Converting R,G,B Differential video into single ended R,G,B video

Question   : How to Calculate Rs and cutoff frequency at input side of AD8145 if i am using 3 positive clamp and 3 negative clamp diodes(1N4448) and Differential input termination Resistor RT = 120 ohms (Datasheet of AD8145, Page No 17 ,Figure 40. Using Two 1N4448 Diodes in Series as a Clamp) ?

How to calculate Rs if i have to use 3 positive clamp and 3 negative clamp diodes(1N4448) in AD8145.

Note that i am using 120 ohms as a differential termination(RT) resistor and I want 40MHz band width in front end of AD8145 and also provide the calculation for bandwidth and Rs calculations.

Regards,

Tendulkar S