Input Resistance of Transistor Amplifier Solution

STEP 0: Pre-Calculation Summary
Formula Used
Input Resistance = Amplifier Input/Input Current
Rin = Vip/iin
This formula uses 3 Variables
Variables Used
Input Resistance - (Measured in Ohm) - Input resistance 2 is the opposition that an electrical component or circuit presents to the flow of electrical current when a voltage is applied to it.
Amplifier Input - (Measured in Volt) - Amplifier input is a measure of how much an amplifier “amplifies” the input signal.
Input Current - (Measured in Ampere) - Input current is the current sent to the wire.
STEP 1: Convert Input(s) to Base Unit
Amplifier Input: 0.152 Volt --> 0.152 Volt No Conversion Required
Input Current: 0.5 Milliampere --> 0.0005 Ampere (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Rin = Vip/iin --> 0.152/0.0005
Evaluating ... ...
Rin = 304
STEP 3: Convert Result to Output's Unit
304 Ohm -->0.304 Kilohm (Check conversion here)
FINAL ANSWER
0.304 Kilohm <-- Input Resistance
(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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10+ Emitter Follower Calculators

Output Resistance of Emitter Follower
Go Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1)
Collector Current in Active Region when Transistor Acts as Amplifier
Go Collector Current = Saturation Current*e^(Voltage across Base Emitter Junction/Threshold Voltage)
Saturation Current of Emitter Follower
Go Saturation Current = Collector Current/e^(Voltage across Base Emitter Junction/Threshold Voltage)
Input Resistance of Emitter Follower
Go Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)
Base Resistance across Emitter follower Junction
Go Base Resistance = High Frequency Constant*Emitter Resistance
Total Emitter Resistance of Emitter Follower
Go Emitter Resistance = Base Resistance/High Frequency Constant
Output Resistance of Transistor at Intrinsic Gain
Go Finite Output Resistance = Early Voltage/Collector Current
Collector Current of Emitter Follower Transistor
Go Collector Current = Early Voltage/Finite Output Resistance
Input Resistance of Transistor Amplifier
Go Input Resistance = Amplifier Input/Input Current
Input Voltage of Emitter Follower
Go Emitter Voltage = Base Voltage-0.7

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Open Circuit Bipolar Cascode Voltage Gain
Go Bipolar Cascode Voltage Gain = -MOSFET Primary Transconductance*(MOSFET Secondary Transconductance*Finite Output Resistance)*(1/Finite Output Resistance of Transistor 1+1/Small Signal Input Resistance)^-1
Output Resistance of Emitter Follower
Go Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1)
Drain Resistance of Cascode Amplifier
Go Drain Resistance = (Output Voltage Gain/(MOSFET Primary Transconductance^2*Finite Output Resistance))
Output voltage gain of MOS Cascode Amplifier
Go Output Voltage Gain = -MOSFET Primary Transconductance^2*Finite Output Resistance*Drain Resistance
Collector Current in Active Region when Transistor Acts as Amplifier
Go Collector Current = Saturation Current*e^(Voltage across Base Emitter Junction/Threshold Voltage)
Saturation Current of Emitter Follower
Go Saturation Current = Collector Current/e^(Voltage across Base Emitter Junction/Threshold Voltage)
Equivalent Resistance of Cascode Amplifier
Go Resistance between Drain and Ground = (1/Finite Output Resistance of Transistor 1+1/Input Resistance)^-1
Negative Voltage Gain of Cascode Amplifier
Go Negative Voltage Gain = -(MOSFET Primary Transconductance*Resistance between Drain and Ground)
Input Resistance of Emitter Follower
Go Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)
Base Resistance across Emitter follower Junction
Go Base Resistance = High Frequency Constant*Emitter Resistance
Total Emitter Resistance of Emitter Follower
Go Emitter Resistance = Base Resistance/High Frequency Constant
Output Resistance of Transistor at Intrinsic Gain
Go Finite Output Resistance = Early Voltage/Collector Current
Collector Current of Emitter Follower Transistor
Go Collector Current = Early Voltage/Finite Output Resistance
Input Resistance of Transistor Amplifier
Go Input Resistance = Amplifier Input/Input Current
Input Voltage of Emitter Follower
Go Emitter Voltage = Base Voltage-0.7

Input Resistance of Transistor Amplifier Formula

Input Resistance = Amplifier Input/Input Current
Rin = Vip/iin

What is the function of amplifier?

An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds. They can be categorized as either weak-signal amplifiers or power amplifiers.

How to Calculate Input Resistance of Transistor Amplifier?

Input Resistance of Transistor Amplifier calculator uses Input Resistance = Amplifier Input/Input Current to calculate the Input Resistance, The Input Resistance of Transistor Amplifier formula refers to the measure of how much the amplifier circuit resists the flow of input current. Input Resistance is denoted by Rin symbol.

How to calculate Input Resistance of Transistor Amplifier using this online calculator? To use this online calculator for Input Resistance of Transistor Amplifier, enter Amplifier Input (Vip) & Input Current (iin) and hit the calculate button. Here is how the Input Resistance of Transistor Amplifier calculation can be explained with given input values -> 0.0117 = 0.152/0.0005.

FAQ

What is Input Resistance of Transistor Amplifier?
The Input Resistance of Transistor Amplifier formula refers to the measure of how much the amplifier circuit resists the flow of input current and is represented as Rin = Vip/iin or Input Resistance = Amplifier Input/Input Current. Amplifier input is a measure of how much an amplifier “amplifies” the input signal & Input current is the current sent to the wire.
How to calculate Input Resistance of Transistor Amplifier?
The Input Resistance of Transistor Amplifier formula refers to the measure of how much the amplifier circuit resists the flow of input current is calculated using Input Resistance = Amplifier Input/Input Current. To calculate Input Resistance of Transistor Amplifier, you need Amplifier Input (Vip) & Input Current (iin). With our tool, you need to enter the respective value for Amplifier Input & Input 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 Input Resistance?
In this formula, Input Resistance uses Amplifier Input & Input Current. We can use 2 other way(s) to calculate the same, which is/are as follows -
  • Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)
  • Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)
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