You are given the large signal model for a P+/N junction diode as shown in the figure. Which of the following change will cause the most reduction of the series resistance RS?

Question

BlackTom AI · Accepted Answer

We are asked which change will cause the largest reduction in the series resistance RS of a P+/N junction diode as shown.
Option 1: increase the P+ doping. Increasing the donor/acceptor concentration on the P+ side would raise the hole concentration in the P+ region, reducing its resistive term somewhat, but the overall series resistance RS is influenced by the combined resistive path through both regions and the geometry. Since the P+ side typically has lower mobility for holes and may be thinner or less dominant in the current path, the impact on RS may be present but relatively modest.
Option 2: reduce the P+ doping. Lowering the P+ doping would decrease hole concentration and increase resistivity in the P+ region, which tends to increase RS, not reduce it, so this choice would worsen RS rather than reduce it.
Option 3: increase the N doping. Increasing the dopant concentration on the N side boosts electron concentration and, because electron mobility is relatively high, the resistive contribution of the N region drops more substantially. This tends to reduce the overall series resistance more effectively, especially if the N side is a major part of the current path.
Option 4: reduce the N doping. Lowering the N-side doping reduces carrier concentration and increases resistivity in the N region, which would increase RS, not reduce it.
In summary, choices that raise carrier density and support higher conductivity in the current path tend to lower RS, while choices that lower carrier density raise RS. Between the options, increasing the N doping most directly reduces the primary resistive contribution from the N-side path due to higher mobility and the typically larger role of the N region in the current transport, making it the most effective way to reduce RS.

EESM5200 (L2) Part I: Topic 8 - PN Junction Switching and Model

You are given the large signal model for a P+/N junction diode as shown in the figure. Which of the following change will cause the most reduction of the series resistance RS?

View Explanation

Log in for full answers

Similar Questions

A reverse bias is applied to a PN junction and a light is shined onto it. Assume the energy of the light is close to the bandgap of the semiconductor material. Which of the following change is likely to give to largest increase the magnitude of the reverse current of the PN junction?

Match the items to the descriptions 1: 2: 3:

Match the items to the descriptions 1: 2: 3:

Match the items to the descriptions 1: 2: 3:

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler

EESM5200 (L2) Part I: Topic 8 - PN Junction Switching and Model

You are given the large signal model for a P+/N junction diode as shown in the figure. Which of the following change will cause the most reduction of the series resistance RS?

View Explanation

Log in for full answers

Similar Questions

A reverse bias is applied to a PN junction and a light is shined onto it. Assume the energy of the light is close to the bandgap of the semiconductor material. Which of the following change is likely to give to largest increase the magnitude of the reverse current of the PN junction?

Match the items to the descriptions 1: ____ 2: ____ 3: ____

Match the items to the descriptions 1: ____ 2: ____ 3: ____

Match the items to the descriptions 1: ____ 2: ____ 3: ____

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

More Practical Tools for Students Powered by AI Study Helper

Making Your Study Simpler

Match the items to the descriptions 1: 2: 3:

Match the items to the descriptions 1: 2: 3:

Match the items to the descriptions 1: 2: 3: