Question Bank (3 marks) · Q3
Q.Give the comparision between BJT and JFET.
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The JFET is unipolar, voltage-controlled, high-input-resistance and less noisy; the BJT is bipolar, current-controlled and low-input-resistance.
| Sl. No. | FET (JFET) | BJT |
|---|---|---|
| 1 | Unipolar device | Bipolar device |
| 2 | Conduction by majority carriers only (either electrons or holes) | Conduction by both majority and minority carriers (both electrons and holes) |
| 3 | Voltage-controlled device | Current-controlled device |
| 4 | Input resistance very high (order of several mega ohm) | Input resistance very low (order of few kilo ohm) |
| 5 | High switching speed | Low switching speed |
| 6 | Less noisy | More noisy compared to FET |
| 7 | Fabrication is simpler in IC form | Comparatively difficult to fabricate in IC form |
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