Illustrate working of differential amplifier, Electrical Engineering

Assignment Help:

Q. Illustrate working of Differential Amplifier?

Figure shows a weighted differencing amplifier, where "weighted" refers to the fact that the output voltage has the form vo = wava + wbvb, in which the weighting coefficients wa and wb are the voltage gains seen by the inputs. Since the network is linear, superposition can be applied for analysis. First, by grounding the input terminal of R3, let us make va = 0. Except for the presence of R3 in parallel with R4, between terminal 2 and ground, the circuit is that of an inverting amplifier of gain -R2/R1 to the input vb. Since no current flows at terminal 2, it follows that

wb = - R2 / R1

Next, by grounding the left terminal of R1, let us make vb = 0. With respect to the voltage on terminal 2, note that the circuit is that of a noninverting amplifier with gain 1 + R2/R1. The voltage divider, consisting of R3 and R4, corresponds to a gain of R4/(R3 + R4) from the input to terminal 2. Thus the overall gain becomes

1056_Illustrate working of Differential Amplifier.png

1478_Illustrate working of Differential Amplifier1.png

which corresponds to the response of a differential amplifier. Usually resistor values are so chosen that R3 = R1 and R4 = R2 for some practical reasons. Improved versions of differential amplifiers are available commercially.


Related Discussions:- Illustrate working of differential amplifier

Transformer box, a) Illustrate the Schematic diagram of the Transformer Box...

a) Illustrate the Schematic diagram of the Transformer Box used in the Practical Session b)  Calculate the output voltage on an Oscilloscope and determine its amplitude and freq

Sketch the resulting transfer curves, Q. Consider the MOSFET circuit with v...

Q. Consider the MOSFET circuit with variable voltage, with RD = 2k and VDD = 12 V. The static characteristics of the n-channel enhancement MOSFET are given in Figure. (a) Drawt

Design a controller, Linearize the swing equations around an equilibrium po...

Linearize the swing equations around an equilibrium point. Compute the transfer function from the input U to the output !. For which equilibria is the linearizes system stabl

Automotive power-assisted steering system, In terms of negative feedback, t...

In terms of negative feedback, there exists an analogy between the operational amplifier and the power-steering mechanism of an automobile. The hydraulic pump is analogous to the p

Digital control system, block diagram of digital control system and explain...

block diagram of digital control system and explain each block

Write short note on common vs associated channel signalling, Q. Write short...

Q. Write short note on Common vs. associated channel signalling. Associated vs. Common channel signalling: Out band signalling suffers from very limited bandwidth. Both a

Give some applications of constantan, Give some applications of constantan....

Give some applications of constantan. Constantan is an alloy of nickel and copper. It is used in thermocouples, motor starters and precision resistors.

Installation of meters and verification of connections, Installation of Met...

Installation of Meters and Verification of Connections Apart from testing and calibrating the meters they must be properly installed as per the links diagram. The points in wh

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd