Chapter 3: Problem 25

From memory only, sketch the common-emitter configuration (for \(n p n\) and \(p n p\) ) and insert the proper biasing arrangement with the resulting current directions for \(I_{B}, I_{C}\), and \(I_{E}\).

Short Answer

Expert verified

The common-emitter configurations for NPN and PNP transistors have been sketched with correct biasing arrangements and the resulting current directions for \(I_{B}\), \(I_{C}\), and \(I_{E}\). The NPN transistor has forward-biased base-emitter and reverse-biased base-collector junctions, with currents mostly flowing from base to emitter. The PNP transistor has reverse-biased base-emitter and forward-biased base-collector junctions, with currents mostly flowing into the emitter.

Step by step solution

Sketch the Common Emitter Configuration for NPN transistor

Draw the common-emitter configuration for an NPN transistor. The emitter is common to both the base and collector. The emitter terminal is on the bottom, the collector terminal is on top, and the base terminal is in the middle. The arrow on the emitter points out, indicating conventional current flow.

Indicate the Biasing Arrangements and Current Direction for NPN transistor

Add the biasing arrangement for the NPN transistor. The base-emitter junction is forward biased by the battery \(V_{BB}\) which allows current to flow from the base to the emitter, hence indicating the direction of \(I_{B}\) and \(I_{E}\). The collector-base junction is reverse biased by battery \(V_{CC}\), and this creates the collector current \(I_{C}\) direction from collector to emitter.

Sketch the Common Emitter Configuration for PNP transistor

Draw the common-emitter configuration for a PNP transistor. This configuration is similar to the NPN configuration, except the arrow on the emitter terminal points inwards.

Indicate the Biasing Arrangements and Current Direction for PNP transistor

Add the biasing arrangement for the PNP transistor. The base-emitter junction is reverse biased and the collector-base junction is forward biased. The base current \(I_{B}\) flows from the emitter to the base, and the collector current \(I_{C}\) flows from the emitter to the collector. The emitter current \(I_{E}\) is the sum of \(I_{C}\) and \(I_{B}\), and it flows out of the emitter.

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From memory only, sketch the common-emitter configuration (for \(n p n\) and \(p n p\) ) and insert the proper biasing arrangement with the resulting current directions for \(I_{B}, I_{C}\), and \(I_{E}\).

Short Answer

Step by step solution

Sketch the Common Emitter Configuration for NPN transistor

Indicate the Biasing Arrangements and Current Direction for NPN transistor

Sketch the Common Emitter Configuration for PNP transistor

Indicate the Biasing Arrangements and Current Direction for PNP transistor

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