Input Offset Voltage of BJT Differential Amplifier Calculator

✖Threshold Voltage is defined as the minimum amount of voltage required by the transistor to turn on.ⓘ Threshold Voltage [V_th]			+10% -10%
✖Change in Collector Resistance is the increment or decrement in resistance passing through the collector region.ⓘ Change in Collector Resistance [ΔR_c]			+10% -10%
✖Collector Resistance helps to set the transistor at the "operating point" of the amplifier. The purpose of the emitter resistor Re is to prevent thermal runaway.ⓘ Collector Resistance [R_C]			+10% -10%

✖Input offset voltage is the voltage that must be applied between the two input terminals of the op-amp to obtain zero volts at the output.ⓘ Input Offset Voltage of BJT Differential Amplifier [V_os]

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Formula

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Input Offset Voltage of BJT Differential Amplifier

Formula

`"V"_{"os"} = "V"_{"th"}*("ΔR"_{"c"}/"R"_{"C"})`

Example

`"0.00875V"="0.7V"*("0.002kΩ"/"0.16kΩ")`

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Download BJT Differential Amplifiers Formulas PDF

Input Offset Voltage of BJT Differential Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Offset Voltage = Threshold Voltage*(Change in Collector Resistance/Collector Resistance)
V_os = V_th*(ΔR_c/R_C)
This formula uses 4 Variables

Variables Used

Input Offset Voltage - (Measured in Volt) - Input offset voltage is the voltage that must be applied between the two input terminals of the op-amp to obtain zero volts at the output.
Threshold Voltage - (Measured in Volt) - Threshold Voltage is defined as the minimum amount of voltage required by the transistor to turn on.
Change in Collector Resistance - (Measured in Ohm) - Change in Collector Resistance is the increment or decrement in resistance passing through the collector region.
Collector Resistance - (Measured in Ohm) - Collector Resistance helps to set the transistor at the "operating point" of the amplifier. The purpose of the emitter resistor Re is to prevent thermal runaway.

STEP 1: Convert Input(s) to Base Unit

Threshold Voltage: 0.7 Volt --> 0.7 Volt No Conversion Required
Change in Collector Resistance: 0.002 Kilohm --> 2 Ohm (Check conversion here)
Collector Resistance: 0.16 Kilohm --> 160 Ohm (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

V_os = V_th*(ΔR_c/R_C) --> 0.7*(2/160)

Evaluating ... ...

V_os = 0.00875

STEP 3: Convert Result to Output's Unit

0.00875 Volt --> No Conversion Required

FINAL ANSWER

0.00875 Volt <-- Input Offset Voltage

(Calculation completed in 00.004 seconds)

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< 4 DC Offset Calculators

Common Mode Rejection Ratio of BJT Differential Amplifier in dB

Go Common Mode Rejection Ratio = 20*log10(modulus(Differential Gain/Common Mode Gain))

Input Offset Voltage of BJT Differential Amplifier

Go Input Offset Voltage = Threshold Voltage*(Change in Collector Resistance/Collector Resistance)

Input Offset Current of Differential Amplifier

Go Input Offset Current = modulus(Input Bias Current 1-Input Bias Current 2)

Common Mode Gain of BJT Differential Amplifier

Go Common Mode Gain = Differential Output Voltage/Differential Input Voltage

Input Offset Voltage of BJT Differential Amplifier Formula

Input Offset Voltage = Threshold Voltage*(Change in Collector Resistance/Collector Resistance)
V_os = V_th*(ΔR_c/R_C)

What is a differential amplifier using BJT gain?

The basic differential pair configuration consists of two BJTs wherein the two inputs V₁ and V₂ are applied to the bases of the two BJTs with base resistors R₁ and R₂, their collectors are connected to the power supply V_cc via collector resistors R₁ and R₂ and their emitter are connected to a common emitter resistor R_E .

How to Calculate Input Offset Voltage of BJT Differential Amplifier?

Input Offset Voltage of BJT Differential Amplifier calculator uses Input Offset Voltage = Threshold Voltage*(Change in Collector Resistance/Collector Resistance) to calculate the Input Offset Voltage, The Input Offset Voltage of BJT Differential Amplifier given collector resistance formula is defined as the voltage that must be applied between the two input terminals of the op-amp to obtain zero volts at the output. Ideally, the output of the op-amp should be at zero volts when the inputs are grounded. Input Offset Voltage is denoted by V_os symbol.

How to calculate Input Offset Voltage of BJT Differential Amplifier using this online calculator? To use this online calculator for Input Offset Voltage of BJT Differential Amplifier, enter Threshold Voltage (V_th), Change in Collector Resistance (ΔR_c) & Collector Resistance (R_C) and hit the calculate button. Here is how the Input Offset Voltage of BJT Differential Amplifier calculation can be explained with given input values -> 0.00875 = 0.7*(2/160).

FAQ

What is Input Offset Voltage of BJT Differential Amplifier?

The Input Offset Voltage of BJT Differential Amplifier given collector resistance formula is defined as the voltage that must be applied between the two input terminals of the op-amp to obtain zero volts at the output. Ideally, the output of the op-amp should be at zero volts when the inputs are grounded and is represented as V_os = V_th*(ΔR_c/R_C) or Input Offset Voltage = Threshold Voltage*(Change in Collector Resistance/Collector Resistance). Threshold Voltage is defined as the minimum amount of voltage required by the transistor to turn on, Change in Collector Resistance is the increment or decrement in resistance passing through the collector region & Collector Resistance helps to set the transistor at the "operating point" of the amplifier. The purpose of the emitter resistor Re is to prevent thermal runaway.

How to calculate Input Offset Voltage of BJT Differential Amplifier?

The Input Offset Voltage of BJT Differential Amplifier given collector resistance formula is defined as the voltage that must be applied between the two input terminals of the op-amp to obtain zero volts at the output. Ideally, the output of the op-amp should be at zero volts when the inputs are grounded is calculated using Input Offset Voltage = Threshold Voltage*(Change in Collector Resistance/Collector Resistance). To calculate Input Offset Voltage of BJT Differential Amplifier, you need Threshold Voltage (V_th), Change in Collector Resistance (ΔR_c) & Collector Resistance (R_C). With our tool, you need to enter the respective value for Threshold Voltage, Change in Collector Resistance & Collector 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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