Articles Tagged ‘Summing amplifier’

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Useful Operational Amplifier Formulas and Configurations

Sunday, August 23rd, 2009

Summary:

A compilation of Op Amp configurations and transfer functions.

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Categories: Analog Design, Operational Amplifier Formulas

How to Derive the Transfer Function of the Inverting Summing Amplifier

Monday, August 17th, 2009

Summary:

The inverting summing amplifier does exactly what its name says: adds the input signals and inverts the result. This amplifier presents a major advantage versus the non-inverting summing amplifier. The input signals are added with their own gain. The disadvantage is the inversion of the sum, which might not be desirable in some cases. How can we derive this function? What is the transfer function of the inverting summing amplifier with 3, 4, or n inputs? This article answers all these questions.

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Categories: Analog Design, Operational Amplifier Formulas, Summing amplifier, Superposition Theorem

The Transfer Function of the Non-Inverting Summing Amplifier with “N” Input Signals

Sunday, August 9th, 2009

Summary:

In a previous article, How to Derive the Summing Amplifier Transfer Function, I deduced the formula for the non-inverting summing amplifier with two signals in its input. But what if we have 3, 4 or an n number of signals? Can we add them all with one amplifier?

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Categories: Analog Design, Operational Amplifier Formulas, Summing amplifier, Superposition Theorem

How to Derive the Summing Amplifier Transfer Function

Thursday, July 9th, 2009

Summary:

The summing amplifier, or the non-inverting summing amplifier, is an analog processing circuit with the transfer function (the summing amplifier formula as some say) shown in the following equation.

(1)

The first term of the product is the actual summing, while the second term is a gain due to the R3 and R4 resistors.  I prefer this [...]

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Categories: Analog Design, Operational Amplifier Formulas, Summing amplifier, Superposition Theorem

Converting a Differential Amplifier into a Summing Amplifier

Thursday, June 25th, 2009

Summary:

Is there any link between a differential amplifier and a summing amplifier? Yes, it is. They can be easily converted one into the other one. While this article shows the conversion, the main purpose is to demonstrate how the same circuit can be viewed as a differential amplifier or as a summing amplifier, depending on the voltage levels in its inputs.

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Categories: Analog Design, Differential Amplifier, Summing amplifier, Superposition Theorem

Solving the Summing Amplifier

Thursday, June 18th, 2009

Summary:

This article describes how to design a summing amplifier based on the input and output requirements.

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Categories: Analog Design, Summing amplifier

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