What is diode small signal resistance?

AI Thread Summary
Diode small signal resistance, also known as dynamic resistance, is defined as the derivative of voltage with respect to current (dV/dI) at a specific operational point on the voltage-current (VA) curve. Unlike resistors, which have a constant resistance represented by a straight line on a V vs I graph, diodes exhibit a curved relationship, making their resistance variable. The small signal resistance is determined at a particular bias or DC operating point and is only applicable for small deviations from this point. Understanding this concept is crucial for accurate diode modeling in electronic circuits. The discussion emphasizes the importance of recognizing the non-linear characteristics of diodes in circuit analysis.
Anik Paul
Messages
4
Reaction score
0
I'm not realising this thing.
 
Engineering news on Phys.org
Hello, in my opinion it's also called dynamic resistance. It's derivative at given operational point on VA curve, dV/dI.
 
  • Like
Likes Anik Paul
If you plot a V vs I graph for a resistor you get a straight line. The slope is the resistance.

Same graph for a diode is a curve so the slope (resistance) isn't constant. The small signal resistance is the slope at a particular point on the graph. That point is usually called bias or DC operating point. The resistance is only valid for small deviations from the bias point hence why its called the small signal resistance.
 
  • Like
Likes GrahamN-UK, Anik Paul and Averagesupernova

Thread '3-terminal device external modeling'

Very basic question. Consider a 3-terminal device with terminals say A,B,C. Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) establish two relationships between the 3 currents entering the terminals and the 3 terminal's voltage pairs respectively. So we have 2 equations in 6 unknowns. To proceed further we need two more (independent) equations in order to solve the circuit the 3-terminal device is connected to (basically one treats such a device as an unbalanced two-port...
View full post »

Thread 'Two capacitors, etc.'

suppose you have two capacitors with a 0.1 Farad value and 12 VDC rating. label these as A and B. label the terminals of each as 1 and 2. you also have a voltmeter with a 40 volt linear range for DC. you also have a 9 volt DC power supply fed by mains. you charge each capacitor to 9 volts with terminal 1 being - (negative) and terminal 2 being + (positive). you connect the voltmeter to terminal A2 and to terminal B1. does it read any voltage? can - of one capacitor discharge + of the...
View full post »

Similar threads

Understanding diode (LED) resistance at V=0
Replies
11
Views
2K
Need help with PIN diode selection in RF switching circuit
Replies
2
Views
1K
Troubleshooting Laser Diode Circuit with Arduino and PN2222a Transistor
Replies
10
Views
2K
Relay Control of Induction Motors
Replies
5
Views
721
Understanding PV Cell Modeling: Single vs Double Diode
Replies
11
Views
2K
Resistance, capacitance, inductance of a real wire
Replies
2
Views
2K
Multiple signals controlling relay
Replies
7
Views
171
I have a question about diodes and the PN junction
Replies
2
Views
2K
Simulate Leakage Current - Reverse Bias Diode
Replies
7
Views
4K
Why Are My Diode IV Characteristics Readings Different?
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top