Show how an ideal Operational Amplifier with an open loop gain = A can be used to provide:
i) a non-inverting amplifier with gain= +6v/v.
ii) an inverting amplifier with gain= -3v/v.
iii) an integrator with gain= +3.
Explain the purpose of every component in your circuits.
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Figure 1: Inverting amplifier circuit.
Figure 2: Noninverting amplifier circuit.
The way that you define the gain is by setting the ratio of R1 to R2. Neither of these resistors will ever have much power going thru them, so these can be very tiny - often 1/4 or 1/8 watt resistors are used. To keep power consumption down, as well as noise introduced by cheap carbon resistors, we will use resistors in a range of 10,000 Ohms thru 1 Meg Ohm.
If R2 is equal to R1, then we have Unity Gain, or a 1X Amplifier - This is a 1:1 ratio. if R2 is twice the resistance of R1, we have an Amplifier with a gain of 2 - a 2:1 ratio. To build the 2X gain amplifier, lets pick resistor values that will set the 2:1 ratio - R2 = 20,000 ohms and R1 = 10,000 ohms (20000:10000 = 2:1). That really wasn't that hard to do.
A(i) Non Inverting Amplifier :
Gain = 1 + R2/R1
6 = 1+ R2 / R1
R2 /R1 = ...
Solution presents Operational Amplifier as non inverting, inverting and integrator.
Gain-frequency characteristics of a common operational amplifier
a) Determine the gain-frequency characteristics of a common operational amplifier.
b) Calculate the cut off frequency of an op-amp having characteristics
Avd - Large-signal differential voltage amplification = 20
B1 - Unity gain bandwidth = 1MHz
c) Estimate the input offset voltage for the Multisim 741 model of figure-3.
d) Estimate the input bias currents and input offset current for the Multisim 741 model given in figure-3.
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