- #1

hadoque

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## Homework Statement

A pulse generator is connected to an oscilloscope, as in the image. The pulse generator has an internal impedance of 50Ohm and the oscilloscope is set to 1MOhm. The cable between the devices has a characteristic impedance of 75Ohm. The pulse from the generator has an amplitude of 1V and it's long enough to interfer with the reflecting pulse (if any). What is the proper resistance of the termination at B?

## Homework Equations

[itex]V_r = V_0 \frac{Z-Z_0}{Z+Z_0}[/itex]

## The Attempt at a Solution

At A there will be a reflection because of the higher impedance. The reflection amplitude will be

[itex]V_r = 1\text{V} \frac{75-50\Omega}{75+50\Omega}=\frac{1}{5}\text{V}[/itex]

Now, would this reflection increase (decrease seems more reasonable...) the amplitude of the pulse arriving at B, with 1/5V?

Would then a proper calculation of the termination be using V0= 1.2V, Z0=75Ohm and Z=-0.2?