Success TrackerSuccess Tracker
Log inSign up

GATE EC 2017 Set 1 — Question 38

Go beyond PYQs with Success TrackerAI-powered personalised practice and doubt support. Unlimited practice on eligible plans; AI usage limits apply.
NAT+2 / -0MediumDepletion & Diffusion CapacitanceP-N Junction & DiodesElectronic Devices

Electronic Devices → P-N Junction & Diodes → Depletion & Diffusion Capacitance

Last updated

Question

As shown, two Silicon (Si) abrupt pp-nn junction diodes are fabricated with uniform donor doping concentrations of ND1=1014 cm−3N_{D1} = 10^{14}\ \text{cm}^{-3} and ND2=1016 cm−3N_{D2} = 10^{16}\ \text{cm}^{-3} in the nn-regions, and uniform acceptor doping concentrations of NA1=1014 cm−3N_{A1} = 10^{14}\ \text{cm}^{-3} and NA2=1016 cm−3N_{A2} = 10^{16}\ \text{cm}^{-3} in the pp-regions of the diodes, respectively. Assuming that the reverse bias voltage is ≫\gg built-in potentials of the diodes, the ratio C2/C1C_2/C_1 of their reverse bias capacitances for the same applied reverse bias, is ________.
Diagrams of Diode 1 and Diode 2 showing doping concentrations in p and n regions
Your answer

Enter a number. Decimals, negative values and scientific notation are accepted.

The solution stays hidden until you check.

Continue learning with Success Tracker

A step still unclear? Work through it with support

Use Success Tracker to ask about the reasoning, then try another GATE EC question to check your understanding.

AI-powered practice· Unlimited practice on eligible plans
PYQs with solutions
Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
Practice that adapts
Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
AI doubt support
Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.

Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.

Start with a free accountView plans and allowances

This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.

More questions on P-N Junction & Diodes

2026 Set 1 Q14Consider carrier transport in a Zener diode in the breakdown region. Which is the dominant…2026 Set 1 Q18Consider the circuit shown in the Figure with Vi=3 VV_i = 3\text{ V} and VCC=12 VV_{CC} = 12\text{ V}. Assume…2026 Set 1 Q25Consider a p-n junction diode when it is forward biased with 2 V. Which of the following is/are the…2026 Set 1 Q29Figure shows the output characteristics of two different Bipolar Junction Transistors (BJT), BJT 1…2026 Set 1 Q54Consider an LED based on a direct bandgap semiconductor material with energy bandgap 1.31.3 eV.…