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Electronics Engineering

Differential Amplifier Zi Calculator

Electronics Engineering

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Differential Amplifier Zi

Equation and meaning

\[Z_i = h_ie + ( 1 + h_fe ) \cdot 2 \cdot R_e\]

Zi for Differential Amplifier

Variables in this formula

h_fe — H Fe
Enter this value unless it is the selected unknown.
h_ie — H Ie
Enter this value unless it is the selected unknown.
R_e — R E
Enter this value unless it is the selected unknown.
Z_i — Z I
Enter this value unless it is the selected unknown.
Equation 2

Equation and meaning

\[Z_{i} = 2 \cdot h_{fe} \cdot R_{e} \cdot 2 \cdot \beta \cdot R_{e}\]

Zi for Differential Amplifier

Variables in this formula

beta — Beta
Enter this value unless it is the selected unknown.
h_fe — H Fe
Enter this value unless it is the selected unknown.
R_e — R E
Enter this value unless it is the selected unknown.
Z_i — Z I
Enter this value unless it is the selected unknown.

How to use this calculator

  1. Leave one value emptyThe empty field is automatically treated as the unknown.
  2. Enter known values and unitsChoose N, kgf, dyn, SI or another compatible unit when available.
  3. Review the automatic answerThe result appears immediately and is substituted back into the formula to check the residual.
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