Direction: Consider the circuit given below. The transistor parameters are β = 120 and VA = ∞ , VBE = 0.7 V
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The hybrid-π parameter values of gm, rπ and r0 are:
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- 24 mA/V, ∞, 5 kΩ
- 24 mA/V, 5 kΩ, ∞
- 48 mA/V, 10 kΩ, 18.4 kΩ
- 48 mA/V, 18.4 kΩ, 10 kΩ
Correct Option: B
Given that, β = 120
VA = ∞
| IB = | = | = 5.2 µA | ||
| 250 kΩ | 250 kΩ |
ICQ = β IB = 120 × 5.2 × 10–6 = 0.642 mA
Now,
| gm = | = | = 24 mA/V | ||
| VT | 26 × 10–3 |
| rπ = | = | = 5 kΩ | ||
| gm | 24 × 10–3 |
| r0 = | = | = ∞ | ||
| ICQ | 24 × 10–3 |
