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How can you calculate the input impedance of a network using h-parameters?

by in Network parameters (Z, Y, h, ABCD parameters) 87 views
How can you calculate the input impedance of a network using h-parameters?

1 Answer

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To calculate the input impedance of a network using h-parameters (hybrid parameters), you'll need to have access to the h-parameter matrix of the network. The h-parameter matrix is a set of four parameters that describe the linear behavior of a two-port network.

The h-parameter matrix for a two-port network can be represented as follows:

| I1 | h11 h12 | | V1 |
|----|-----------|*|----|
| I2 | h21 h22 | | V2 |

Where:

I1 and V1 are the input current and voltage, respectively.
I2 and V2 are the output current and voltage, respectively.
h11, h12, h21, and h22 are the h-parameters of the network.

The input impedance (Zin) can be calculated using the following formula:

Zin = (V1 / I1) = h11 - (h12 * (I2 / I1))

To find the values of h11, h12, h21, and h22, you can either measure them experimentally or use a simulator/software that can analyze the network and provide you with the h-parameter values.

Once you have the h-parameter values, simply plug them into the formula to calculate the input impedance (Zin). Keep in mind that h-parameters are valid for small-signal linear analysis and may not be applicable in certain nonlinear or large-signal scenarios.
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