An operational amplifier (often op amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op amp produces an output potential (relative to circuit ground) that is typically 100,000 times larger than the potential difference between its input terminals. Operational amplifiers had their origins in analog computers, where they were used to perform mathematical operations in linear, non-linear, and frequency-dependent circuits.
The popularity of the op amp as a building block in analog circuits is due to its versatility. By using negative feedback, the characteristics of an op-amp circuit, its gain, input and output impedance, bandwidth etc. are determined by external components and have little dependence on temperature coefficients or engineering tolerance in the op amp itself.
Op amps are used widely in electronic devices today, including a vast array of consumer, industrial, and scientific devices. Many standard IC op amps cost only a few cents; however, some integrated or hybrid operational amplifiers with special performance specifications may cost over US$100 in small quantities. Op amps may be packaged as components or used as elements of more complex integrated circuits.
The op amp is one type of differential amplifier. Other types of differential amplifier include the fully differential amplifier (similar to the op amp, but with two outputs), the instrumentation amplifier (usually built from three op amps), the isolation amplifier (similar to the instrumentation amplifier, but with tolerance to common-mode voltages that would destroy an ordinary op amp), and negative-feedback amplifier (usually built from one or more op amps and a resistive feedback network).
Hi all, I attached my attempt at a solution in the attached picture. I am using the textbook titiled as ”electronic circuit analysis“ by David E. Johnson, and op amp is in chap 3;
while I did not find any example that attach the Vee and Vcc with amplifier . It seems that v+ = v- doesn’t hold in...
TL;DR Summary: How to calculate the operational amplifiers in the circuit diagram
Hello Everyone,
I am trying to learn the circuit diagram of one of a device in which I will be doing modifications as a part of my Masters's Research to make it performance better. My background is in Mechanical...
TL;DR Summary: Trying to solve the op amp current sense circuit as per the schematic.
I want to solve the below current sense op amp circuit,
Are the calculations correct? As of now i modified the circuit by removing the capacitors, i will add them once the above circuit calculations are...
Summary:: Find the voltage in an OP-amp circuit with current source
I(in) = 1 uA.
What I'm confused about is if there is any voltage flowing through R1. Because if there was and let's say it went downwards, then where would it go, I mean it cannot just disappear. And if it goes upwards...
So after using superposition and setting the ratio R2/R1 = R4/R3 the same or R2=R4 and R1=R3,i come to the eq. for output voltage Vout= R2/R1 * (V2-V1) or R4/R3(V2-V1). And in the book foundations of analog and digital electronics by agarwal and lang, they are saying that this circuit is a...
So i used KCL and both currents are flowing into the node, and then leaving together to go to the resistor R3.
So my eq can be seen in the picture. I was looking in a book and they had a minus infront of the parantheses.
Is the current flowing from R3 into the node??
Using analog discovery 2 kit and the bode plot produced by the network analyzer is off. The scope looks fine and everything is behaving how it should except for the bode plot. The magnitude of the bode plot will start at the correct dB then right before tapering off it shoots up a few dB and...
Had this as a question from a class mate. This op amp should not have any gain in the DC or AC circuit. The coupling cap blocks DC and has no reference to get gain, while the AC needs a cap in the feedback loop to get gain. Is that correct? Oh, this is supposed to be in the inverting configuration.
Hello everyone !
I'm working with a piezoelectric cell and I need to retrieve the variation of the charge of the cell as a voltage signal.
I found this circuit (a charge amplifier) with an OP Amp ( here the piezo cell is represented as the current source with the capacitor and the resistor on...
So basically I am trying to give an output of Vo = 10(V2-V1)
From Figure 9 Example Gain of first Op Amp = Rf / R1, if R1 & R2 are equal.
What's throwing me off is using 5 resistors to create a circuit rather than 6 or just 3. My initial thoughts were the following:
To use the first loop...
Hi,
I am using an Apex PA443DF operational amplifier to drive a sinusoidal signal at 100 V amplitude across a very large resistor with resistance of about 5000 Mega ohms. The amplifiers are set up as noninverting with a gain of 22 and function very well for small resistive loads. The sinusoids...
1. Using the frequency equation I know the time period is 1 millisecond.
2. The duty cycle (50%) equation tells me that the pulse width and the amplitude is 1 V.
3. Thus the input waveform looks like this : (?)
4. As the slew rate is 0.5 volts per microsecond, the output voltage would take...
Here I let ##R_2 = 2 ## kohms and ##R_1 = 1## kohms. Using this suggests that ##R_3 = 0## and ## R_4 = 1 ## kohms (?!)
The resulting circuit is
Is this the correct way to solve this?
PS : I just realized that I have interchanged ##V_1## and ## V_2## in the diagram!
The open loop voltage gain is given as :
$$ u(s) = \frac{u_o}{1+\frac{s}{w_o}} = \frac{100}{1 + \frac{s}{40}}$$
Where u_o is the d.c. voltage gain and w_o is the pole.
The op amp that is given is:
And I am told to use the non ideal op amp model as follows:
Well my guess is that I can find the...
I was wanting to get a book on Op Amps. Ideally it would have lots of examples but I also need it to explain gain, feedback, and all that important material in an understandable manner.
Hello,
I am simulating the input impedance of a high-pass filter with the output voltage of the filter input to the non-inverting pin of an op amp. I'm confused as to why the input impedance can possibly dip below the resistance of the high-pass filter resistor. Please see the following circuit...
Hi Everyone,
I would like to measure voltage output from a sensor via an Arduino. The sensor outputs 20 mV at max capacity. I'd like to bump this up to around 5 volts so it is easier to measure. My plan was to use a non-inverting topology coupled with an LM393N op-amp. The schematic for a...
I've been given the following circuit and have been asked to find the input impedance and the impedance between the input terminal and ground. I've never encountered an operational amplifier configured like this.
I know that the voltages at the - and + terminals of the op amp are ideally equal...
Homework Statement
The op amp has a near ideal level 1 model with G = 5000V/V, ri = inf, ro = 0
How would I obtain the feedback function?
Homework Equations
I know I have to find the feedback function which is:
f = - (ΔV/Vin)
The Attempt at a Solution
I will first drive using the...
Homework Statement
Derive the expressions for the voltage gain (Gv) of the following op amp:
Homework Equations
In = Ip = 0
Vp =VnThe Attempt at a Solution
I can use KCL, and the fact that In and Ip are both 0, to derive the two equations, one from the top node and the other from the...
Homework Statement
The opAmp network shown in figure 68 is a transimpedance amplifer that employs both negative and positive feedback. Assuming that the op-amp is ideal, calculate the value for the output voltage for Jg is 1mA.The circuit and question are this...
Homework Statement
Homework Equations
CMRR = Av/Acm
Acm= Δ/R , Δ = (2 x Tolerance of Resistor).R
The Attempt at a Solution
I have to admit I am a bit confused by the premise of the problem.
My understanding is Vout is used to vary Vcharge in some way, so that Icharge is always 1.3 A. Then...
Homework Statement
Homework Equations
[/B]
CMRR = Av/Acm
Acm= Δ/R , Δ = (2 x Tolerance of Resistor).R
The Attempt at a Solution
I have an issue with part e) and f) but here are all my workings
c) For this part, Acm would be:
10 x10^-3
This makes 2.5mV -> 0.25 uV (which is the same...
Homework Statement
Solve for Vout
Homework Equations
Vout=Vin(1+Rf/R)
The Attempt at a Solution
I get it is a non-inverting op amp but there is no resistor from the non-inverting terminal to the output.
I have no idea how the equation would be. I understand that noninverting is...
Homework Statement
2. Homework Equations
3. The Attempt at a Solution
For the first set of questions:
I've worked through to part 6), at which is I encountered my first problem. I'm not entirely sure what the question is asking. Is it as if there would be a capacitor between...
So, from my textbook, and what seems to be standard, an inverting amplifier circuit goes something like this:
However, when I switch the terminals of the op amp and follow through with the equations, I get the same Vout.
So my question then is what is the difference? I know there is other...
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