Small-Signal Input Resistance given Emitter Current Solution

STEP 0: Pre-Calculation Summary
Formula Used
Small Signal = Signal Current*Emitter Resistance
Vss = isi*Re
This formula uses 3 Variables
Variables Used
Small Signal - (Measured in Volt) - Small signal is an AC signal (more technically, a signal having zero average value) superimposed on a bias signal (or superimposed on a DC constant signal).
Signal Current - (Measured in Ampere) - Signal current is the current in the amplified output current of a transistor.
Emitter Resistance - (Measured in Ohm) - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.
STEP 1: Convert Input(s) to Base Unit
Signal Current: 2.65 Milliampere --> 0.00265 Ampere (Check conversion here)
Emitter Resistance: 0.35 Kilohm --> 350 Ohm (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Vss = isi*Re --> 0.00265*350
Evaluating ... ...
Vss = 0.9275
STEP 3: Convert Result to Output's Unit
0.9275 Volt --> No Conversion Required
FINAL ANSWER
0.9275 Volt <-- Small Signal
(Calculation completed in 00.004 seconds)

Credits

Created by Payal Priya
Birsa Institute of Technology (BIT), Sindri
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Vishwakarma Government Engineering College (VGEC), Ahmedabad
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Small-Signal Input Resistance given Emitter Current Formula

Small Signal = Signal Current*Emitter Resistance
Vss = isi*Re

Why input resistance of a transistor is low?

While using a transistor, the emitter-base junction is always forward biased and the collector-base junction is always reverse-biased. Due to it, a small change in emitter current. This means that a small signal voltage variation at the input of the transistor produces a large emitter current variation. This showed that the input resistance of a transistor is low. Since the collector is reverse-biased, it collects all the charge carriers which diffuse into it, through the base. Due to it, a very large change in collector voltage shows only a small change in the collector current. This shows that the output resistance of the transistor is high.

How to Calculate Small-Signal Input Resistance given Emitter Current?

Small-Signal Input Resistance given Emitter Current calculator uses Small Signal = Signal Current*Emitter Resistance to calculate the Small Signal, The Small-signal input resistance given emitter current suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter. Small Signal is denoted by Vss symbol.

How to calculate Small-Signal Input Resistance given Emitter Current using this online calculator? To use this online calculator for Small-Signal Input Resistance given Emitter Current, enter Signal Current (isi) & Emitter Resistance (Re) and hit the calculate button. Here is how the Small-Signal Input Resistance given Emitter Current calculation can be explained with given input values -> 0.9275 = 0.00265*350.

FAQ

What is Small-Signal Input Resistance given Emitter Current?
The Small-signal input resistance given emitter current suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter and is represented as Vss = isi*Re or Small Signal = Signal Current*Emitter Resistance. Signal current is the current in the amplified output current of a transistor & Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.
How to calculate Small-Signal Input Resistance given Emitter Current?
The Small-signal input resistance given emitter current suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter is calculated using Small Signal = Signal Current*Emitter Resistance. To calculate Small-Signal Input Resistance given Emitter Current, you need Signal Current (isi) & Emitter Resistance (Re). With our tool, you need to enter the respective value for Signal Current & Emitter Resistance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
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