Output Resistance of BJT Solution

STEP 0: Pre-Calculation Summary
Formula Used
Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current
R = (VDD+VCE)/Ic
This formula uses 4 Variables
Variables Used
Resistance - (Measured in Ohm) - Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm.
Supply Voltage - (Measured in Volt) - Supply Voltage is the input voltage source that flows through the BJT.
Collector-Emitter Voltage - (Measured in Volt) - Collector-Emitter Voltage is the electric potential between the base and collector region of a transistor.
Collector Current - (Measured in Ampere) - Collector current is an amplified output current of a bipolar junction transistor.
STEP 1: Convert Input(s) to Base Unit
Supply Voltage: 2.5 Volt --> 2.5 Volt No Conversion Required
Collector-Emitter Voltage: 3.15 Volt --> 3.15 Volt No Conversion Required
Collector Current: 5 Milliampere --> 0.005 Ampere (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
R = (VDD+VCE)/Ic --> (2.5+3.15)/0.005
Evaluating ... ...
R = 1130
STEP 3: Convert Result to Output's Unit
1130 Ohm -->1.13 Kilohm (Check conversion here)
FINAL ANSWER
1.13 Kilohm <-- Resistance
(Calculation completed in 00.004 seconds)

Credits

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Birsa Institute of Technology (BIT), Sindri
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15 Resistance Calculators

Input Resistance of Common Gate Circuit given Transconductance
Go Input Resistance = (1/Transconductance)+(Load Resistance/(Transconductance*Finite Output Resistance))
Output Resistance of CS Amplifier when GMRO is Greater than 1
Go Output Resistance = (1+(Transconductance*Resistance))*Finite Output Resistance
Output Resistance of BJT
Go Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current
Small-Signal Input Resistance between Base and Emitter using Transconductance
Go Signal Resistance = Common Emitter Current Gain/Transconductance
Output Resistance of Transistor when Base Current is Constant
Go Resistance = -(Collector-Emitter Voltage/Collector Current)
Emitter Resistance given Threshold Voltage
Go Emitter Resistance = Threshold Voltage/Emitter Current
Emitter Resistance given Emitter Current
Go Emitter Resistance = Threshold Voltage/Emitter Current
Output Resistance of Simple Current BJT given Early Voltage
Go Output Resistance = Supply Voltage/Reference Current
Small-Signal Input Resistance between Base and Emitter using Base Current
Go Signal Resistance = Threshold Voltage/Base Current
Output Resistance of Current Source given Device Parameter
Go Output Resistance = Device Parameter/Drain Current
Output Resistance of Simple Current BJT
Go Output Resistance = Supply Voltage/Output Current
Small-Signal Input Resistance given Emitter Current
Go Small Signal = Signal Current*Emitter Resistance
Emitter Resistance of BJT
Go Emitter Resistance = Small Signal/Signal Current
Input Resistance of BJT
Go Input Resistance = Input Voltage/Signal Current
Small-Signal Input Resistance between Base and Emitter
Go Signal Resistance = Input Voltage/Base Current

20 BJT Circuit Calculators

Transition Frequency of BJT
Go Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance))
Base Current of PNP Transistor using Saturation Current
Go Base Current = (Saturation Current/Common Emitter Current Gain)*e^(Base-Emitter Voltage/Thermal Voltage)
Total Power Dissipated in BJT
Go Power = Collector-Emitter Voltage*Collector Current+Base-Emitter Voltage*Base Current
Unity-Gain Bandwidth of BJT
Go Unity-Gain Bandwidth = Transconductance/(Emitter-Base Capacitance+Collector-Base Junction Capacitance)
Reference Current of BJT Mirror
Go Reference Current = Collector Current+(2*Collector Current)/Common Emitter Current Gain
Common Mode Rejection Ratio
Go Common Mode Rejection Ratio = 20*log10(Differential Mode Gain/Common Mode Gain)
Output Resistance of BJT
Go Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current
Thermal Equilibrium Concentration of Minority Charge Carrier
Go Thermal Equilibrium Concentration = ((Intrinsic Carrier Density)^2)/Doping Concentration of Base
Output Voltage of BJT Amplifier
Go Output Voltage = Supply Voltage-Drain Current*Load Resistance
Total Power Supplied in BJT
Go Power = Supply Voltage*(Collector Current+Input Current)
Common-Base Current Gain
Go Common-Base Current Gain = Common Emitter Current Gain/(Common Emitter Current Gain+1)
Collector to Emitter Voltage at Saturation
Go Collector-Emitter Voltage = Base-Emitter Voltage-Base-Collector Voltage
Base Current of PNP Transistor given Emitter Current
Go Base Current = Emitter Current/(Common Emitter Current Gain+1)
Base Current of PNP Transistor using Collector Current
Go Base Current = Collector Current/Common Emitter Current Gain
Collector Current using Emitter Current
Go Collector Current = Common-Base Current Gain*Emitter Current
Base Current of PNP Transistor using Common-Base Current Gain
Go Base Current = (1-Common-Base Current Gain)*Emitter Current
Collector Current of BJT
Go Collector Current = Emitter Current-Base Current
Emitter Current of BJT
Go Emitter Current = Collector Current+Base Current
Short-Circuit Transconductance
Go Transconductance = Output Current/Input Voltage
Intrinsic Gain of BJT
Go Intrinsic Gain = Early Voltage/Thermal Voltage

Output Resistance of BJT Formula

Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current
R = (VDD+VCE)/Ic

Define the dynamic output resistance of a transistor amplifier in common - emitter configuration.

For a constant base current IB, the dynamic output resistance (r0 is defined as the ratio of the differential change in the collector-to-emitter voltage (ΔVCE) to the corresponding change in the collector current (ΔIc).

How to Calculate Output Resistance of BJT?

Output Resistance of BJT calculator uses Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current to calculate the Resistance, The Output resistance of BJT is the ratio of voltage to the current flowing in or out of these terminals. Resistance is denoted by R symbol.

How to calculate Output Resistance of BJT using this online calculator? To use this online calculator for Output Resistance of BJT, enter Supply Voltage (VDD), Collector-Emitter Voltage (VCE) & Collector Current (Ic) and hit the calculate button. Here is how the Output Resistance of BJT calculation can be explained with given input values -> 0.00113 = (2.5+3.15)/0.005.

FAQ

What is Output Resistance of BJT?
The Output resistance of BJT is the ratio of voltage to the current flowing in or out of these terminals and is represented as R = (VDD+VCE)/Ic or Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current. Supply Voltage is the input voltage source that flows through the BJT, Collector-Emitter Voltage is the electric potential between the base and collector region of a transistor & Collector current is an amplified output current of a bipolar junction transistor.
How to calculate Output Resistance of BJT?
The Output resistance of BJT is the ratio of voltage to the current flowing in or out of these terminals is calculated using Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current. To calculate Output Resistance of BJT, you need Supply Voltage (VDD), Collector-Emitter Voltage (VCE) & Collector Current (Ic). With our tool, you need to enter the respective value for Supply Voltage, Collector-Emitter Voltage & Collector Current and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Resistance?
In this formula, Resistance uses Supply Voltage, Collector-Emitter Voltage & Collector Current. We can use 1 other way(s) to calculate the same, which is/are as follows -
  • Resistance = -(Collector-Emitter Voltage/Collector Current)
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