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Summary:
What is this circuit good for? It creates a single-ended-input-differential-output amplifier, in which VCM is the common mode and the main signal, in this case the average (VA+VB)/2 rides on top of VCM. It is very useful for fully differential circuits in low noise applications, because differential amplifiers help reduce the common mode noise. VCM in this case, sets the common mode to a useful level as required by the design.
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The Transfer Function of an Amplifier with a Bridge in the Negative Feedback
Friday, July 3rd, 2009Summary:
In allaboutcircuits.com forum an interesting circuit was posted. The question was, how to determine the transfer function, Vout/Vin?
The circuit schematic was drawn as in Figure 1.
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Solving the Differential Amplifier – Part 2
Friday, May 1st, 2009Summary:
But the resistors’ calculation becomes a bit of a challenge, when one might be faced with designing a differential amplifier with a certain transfer function. The example I took in the first article was as follows: Given an input range of, -0.5V to 5.5V, the output has to swing between, -1.25V and +2.365V. I solved the problem by using the amplifier transfer function and a system of equations.
In this article I am going to write about designing the resistors of this differential amplifier using the method of coefficients identification.
Starting from the differential amplifier transfer function …
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Injecting AC into the DC Power Supply Rail
Monday, April 27th, 2009Summary:
In allaboutcircuits.com forum, a question was posted: How can I combine an AC source of known frequency and amplitude with a DC power supply?
I thought this is an interesting problem, so here is the solution.
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Solving the Differential Amplifier – Part 1
Friday, April 24th, 2009Summary:
Design a Differential Amplifier based on the Input and Output Range Requirements.
What is the common usage of the differential amplifier? The circuit is used to amplify the difference between the input signals. However, there are times when the electronics designer is faced with the following problem: Given an input range of, say, -0.5V to 5.5V, the output has to swing between, say -1.25V and +2.365V. It is clear that this requires an amplifier with a certain gain and an offset different than zero. How can we design the differential amplifier to achieve such a function?
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