Question

The $Z_{22}$ - Parameter of a Two-port network is known as _______.

• A. open circuit input impedance
• B. short circuit input impedance
• C. open circuit output impedance
• D. short circuit transfer impedance

Hint:

To identify Z-parameters, remember: $Z_{11}$ is input impedance (with output open), $Z_{22}$ is output impedance (with input open).

Answer 1

The Correct Option is C

Step 1: Recall the Z-parameter matrix.
The Z-parameters or impedance parameters of a two-port network are defined as: \[ \begin{aligned} V_1 &= Z_{11} I_1 + Z_{12} I_2
V_2 &= Z_{21} I_1 + Z_{22} I_2 \end{aligned} \] Step 2: Understand what $Z_{22$ represents.}
To measure $Z_{22}$, set $I_1 = 0$, i.e., open-circuit Port 1. Then: \[ Z_{22} = \left. \frac{V_2}{I_2} \right|_{I_1 = 0} \] So, $Z_{22}$ is the output impedance seen at Port 2 when Port 1 is open-circuited. Conclusion: $\boxed{\text{open circuit output impedance}}$