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A BJT having β = 100 is biased at a dc collector current of 1 mA. The values of gm, re and rπ at the bias point are given respectively by—
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- 20 mA/V, 50 Ω, 2·5 kΩ
- 40 mA/V, 25 Ω, 2·5 kΩ
- 10 mA/V, 100 Ω, 2·5 kΩ
- None of the above
Correct Option: B
We know that
| ● gm = | IC | = | 1 mA | = 40 mA/V |
| VT | 25 mV |
| ● rπ = | β | = | | = 2·5 kΩ |
| gm | 40 mA/V mV |
| ● re = | rπ | = | | ≈ 25 Ω |
| 1 + β | (1 + 100) |
Hence alternative (B) is the correct choice.
