The input impedance cannot be determined directly without running the graphic post processor, Probe.

Its input impedance & radiation pattern are relatively constant over a 2:1 range of frequencies.

Computing these three terms may seem like extra effort, but they are often easier to compute than the overall input impedance.

Where Z is the input impedance of the line.

The input impedance of the amplifier is a load for the source device.

The input impedance of the circuit is almost zero because of the Miller effect.

These amplifiers have high input impedance, which means that the digital system will not need to supply a large current.

For very high frequencies, the input impedance of the stages is low.

The input impedance of a two-port network is given by:

This means the input impedance can no longer be increased arbitrarily in order to reduce the noise figure.