engineering recuitment GATE ECE 2023-24 Test Series Analog Electronics Bipolar Junction Transistors Configuration of BJT
For circuit shown below what would be expression for output impedance (assume VA = ∞)
1
\(R_{0} = \left [ \frac{1}{\frac{1}{R_{C}} + \frac{1+\beta}{r_{\pi }+ (R_{s}||R_{B})}} \right ]\)
2
\(R_{0} = \left [ \frac{1}{\frac{1}{R_{C}} + \frac{\beta}{r_{\pi} + (R_{s}||R_{B})}} \right ]\)
3
\(R_{0} = \left [ \frac{1}{\frac{1}{R_{E}} + \frac{1+\beta}{r_{\pi }+ (R_{s}||R_{B})}} \right ]\)
4
\(R_{0} = \left [ \frac{1}{\frac{1}{R_{E}} + \frac{1}{r_{\pi} + (R_{s}||R_{B})}} \right ]\)