What is Operational amplifiers: Definition and 17 Discussions
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).
THE ANSWER IS GIVEN: 6V, but according to me as the positive terminal is grounded the negative terminal will be virtually grounded (0V), from ohm's law (applying to the two series resistance) it is expected that Vo is 0V! I don't know where I am getting wrong!
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...
where: 𝑣𝑖𝑛(𝑡)=0.3𝑐𝑜𝑠100𝑡
I have read all over the internet that this differential equation can be solved by isolating the term with the highest degree on one side of the equation. After doing so, I integrated it. However after integrating, I don't know that the next step is. Can anyone help me...
Homework Statement
Homework Equations
See above in the question
The Attempt at a Solution
I know that I need to be using a summing amp with the sinusoidal terms but I am struggling to calculate the input values that I need, also I think I need a capacitor in place of R6 but I'm not...
Hello,
I am designing a circuit which basically takes two voltages (V1,V2) and based upon which one of the two is greater, turns corresponding LED. So, I have got to the part where I have output from differential op amp that is the input of the inverting voltage comparator with hysteresis...
Homework Statement
http://prntscr.com/kjbhim
Okay, so I need to draw an op-amp circuit that'll give a 20V output but I have no idea how to start this and this is due in two hours. Could someone please point out to me how to start this off? Thank you so much.
Homework EquationsThe Attempt at...
Homework Statement
Hello,
I am trying to Calculate The Resistance Rf and the value of the Voltage V2. The setup is a logarithmic Op amp connected to a differential Op amp. Both Op amps obey the Golden Rules.
Attached below is my attempt at the solution and the question.
Currently, I have an...
Hello!
I have a bit of trouble finding general op-amps that can amplify at medium frequency ranges, and with a good enough gain of 200 or 46dB. My max desired operating frequency is around 1.2MHz so I don't really care if it no longer amplifies much at frequencies higher than this.
I am aware...
Hi everyone,
I am trying to make a Summing Amlifier. I have simulated on computer where it is working correctly, but on real circuit it is showing some mal functioning. I am using OP 27 Op Apmp. The circuit diagram is attached.
When I try to add DC voltage to AC sine wave, initially sine wave...
Homework Statement
Does a noninverting operational amplifier amplify the frequency of an input, ex. a 2 kHz square wave of amplitude 100mV peak-peak, or just the voltage?
I am an A level physics student. I have a doubt regarding the saturation of op-amps. For a circuit with a dual power supply, each supply has an emf VS. My doubt is, why is the MAXIMUM magnitude of the output voltage VS? Shouldn't it be VS - (- VS) = 2VS? (Since the potential difference is the...
Hi in a homework problem I'm trying to solve circuit. I'm getting the output current of an operational amplifier going into the operational amplifier. Is this allowed? If not than I'm violating Kirchhoff Current law and my other calculated values of the circuit must be wrong.
Thanks for...
Homework Statement
Va = 4V
Vb = 9V
Vc = 13V
Vd = 8V
The 220k resistor is replaced by a variable resistor Rf.
What value of Rf will cause the Op Amp to saturate? Note: 0 ≤ Rf ≤ ∞
When Rf obtains that value, what will be the current flowing into the output terminal of the op amp?
The...
One of the characteristics of an ideal op amp is that it have infinite input impedance/resistance.
Now, I want you to tell me if I am correct :
The voltage source is likely to have some internal resistance.
By having an infinite input resistance, no current is drawn from the voltage...
Homework Statement
http://desmond.imageshack.us/Himg853/scaled.php?server=853&filename=opamp.jpg&res=medium
relevant equations
v=ir (ohm's law)
kirchoff's current law
The Attempt at a Solution
i'm concerned about the bottom left node in this picture. current into an ideal op amp is zero...
So I'm looking at this non-inverting Op-Amp
http://img140.imageshack.us/img140/6660/shomermofa.jpg
Trying to understand how Op-Amps work.
It seems rather strange they're saying no current flows from + to - because then how does the current from Vin spreads through?
After all, there...