Adt2t-1t-1p pdf

As shown above, balun is so if input impedance of balun is 50 Ohm then output impedance is also 50 Ohm. And we have also placed a Ohm resistor across output of balun. So now impedance seen by ClKin pins is Otherwise the impedance of the balun input is in parallel with the emitter resistors and this reduces the effective emitter resistor value.

In this case, given a 50 ohm load at J2, then a ohm DC load would be seen at input to T2. I do not see any reason for R4, it can be left open.

Since this is an input, I think you are considering this backward. The input doesn't need to see ohms. The input needs to be terminated such that it does not reflect energy back to the driver.

The LMK input is high impedance, traditionally you place the ohms in parallel with the high impedance input buffer and have a ohms differential load. When using a balun, then the ohm differential load looks like a 50 ohm single ended load. When using a 50 ohm source and a balun, then the transmission line is properly terminated.

However, when using a a balun differential looks like single ended to your 50 ohm source which is not good for matching and you will have reflections. In this case I simply recommend replacing R with a 50 ohm resistor. Now the balun will present 50 ohms to the load.

Your input amplitude will be less, but the transmission line will be properly terminated. Site Search User. Mentions Tags More Cancel. Tags More Cancel. Share More Cancel. Comment after login. Paypal charge 4. We provide high quality products, thoughtful service and after sale guarantee.

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