Question

All the transistors used in the circuit are matched and have a current gain \( \beta = 20 \). Neglecting the Early effect, the current \( I_{O4} \) in milliamperes is \(\underline{\hspace{2cm}}\). 

Hint:

For matched transistors, the output current is simply the input current multiplied by the current gain \( \beta \).

Answer 1

Correct Answer: 1

For matched transistors, the current through each transistor is related to the input current by the current gain \( \beta \). The current \( I_{O4} \) can be calculated using the following formula: \[ I_{O4} = \beta \cdot I_{in} \] where \( I_{in} = 1.25 \, \text{mA} \). Substituting the values: \[ I_{O4} = 20 \times 1.25 \, \text{mA} = 25 \, \text{mA}. \] Thus, \( I_{O4} = 25 \, \text{mA} \).