# Darlington Transistor $A_I , A_V$

For a darlington configuration: $$h_{ie}=1k,h_{fe}=\beta=50,h_{oe}=25 \times 10^{-6},h_{re}=0 \quad for \quad both \quad transistors,R_L=3k.$$ how can we find the current and voltage gain?

My Approach:

simulate this circuit – Schematic created using CircuitLab

$$Current \quad Gain= I_{R_L}/I_{b1} \quad and \quad Voltage \quad gain = V_{R_L}/V_{input}$$

now how will i proceed....any hints or suggestions please...?

• 'B' = beta equals current gain, but R sets the voltage gain. R can also reduce the current gain, but not increase it beyond the rated beta value. – Sparky256 Jan 28 '18 at 7:25
• Show us a schematic of a circuit. In which configuration this Darlington work? – G36 Feb 18 '18 at 11:09

• $V_{CC}^{V_{CC}}×V_{CC}+V_{CC} = V_{CC}(V_{CC})\int{V_{CC}}_{V_{CC}}^{V_{CC}}$, Vcc. V C C. VCC? Vcc... CCV C C V V C C V VVVC! – Harry Svensson Feb 28 '18 at 12:17