Therefore, the overall current gain, β = β1 × β2 = 255.36 × 1742.16 = 444878. 4. Introducing FET differential amplifier pair at the input stage of differential amplifier produces
A. High output resistance
B. All of the mentioned
C. Low input impedance
D. High input resistance
Answer:A
Therefore, the overall current gain, β = β1 × β2 = 255.36 × 1742.16 = 444878. 4. Introducing FET differential amplifier pair at the input stage of differential amplifier produces
A. High output resistance B. All of the mentioned C. Low input impedance D. High input resistance
Explanation: Input resistance of the order 1012 Ω is possible with JFET at the input stage of differential amplifier.