How are the junctions biased in a transistor when operating in the saturation region?

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 1
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  1. Emitter base junction reverse biased and base-collector junction forward biased
  2. Both the junctions forward biased
  3. Both the junctions reverse biased
  4. Emitter base junction forward biased and base-collector junction reverse biased

Answer (Detailed Solution Below)

Option 2 : Both the junctions forward biased
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Detailed Solution

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A transistor can be operated in one of the three modes: 

1) Active Region

2) Saturation Region

3) Cut-off Region

The biasing for different mode of operation is as shown in the table:

Mode

Emitter -base 

Junction

Collector-Base 

Junction

Cut off

Reverse

Reverse

Active

Forward

Reverse

Reverse Active

Reverse

Forward

Saturation

Forward

Forward

 

∴ For a transistor operating in the saturation region, both the junctions need to be forward bias.

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