All Questions
Tagged with ltspice operational-amplifier
237
questions
3
votes
1
answer
193
views
LT6268-10 Opamp Oscillation and Offset
Below is my Photodiode-OpAmp circuit that is configured as Transimpedance Amplifier.
When I put both inverting and non inverting into ground, no signal is coming out. However when I connect ...
1
vote
0
answers
52
views
Need help analyzing sability of op-amp in a current source in LTSpice
I have to perform stability analysis on an op-amp (AD8671) which is being used as an op-amp in the circuit attached. I am using LTSpice to perform this. My approach is to give a 1V AC small signal at ...
- 11
1
vote
1
answer
56
views
Why does LTC6253-7 not perform properly on LTspice?
I am working with LTC6253-7 op amp which should have a bandwidth of 2 GHz but when I simulate the output for a follower and the output is being severely attenuated. Is there a technique that must be ...
- 448
0
votes
1
answer
41
views
What is this pin for on LTC6253-7 [closed]
I have tried looking at the datasheet but can't seem to find any information on this pin.
- 448
6
votes
1
answer
330
views
Selecting an opamp for a voltage follower circuit using a LTspice simulation
Consider the following circuit:
simulate this circuit – Schematic created using CircuitLab
It is used to supply a 6VDC device (represented by R3) with a 12V car battery. More context on why ...
- 377
4
votes
4
answers
405
views
LTspice third party model gives problem with transient analsys
I have tried to import a third party model from TI, to be precise the op-amp A551. And somehow my circuite, a power amplifier, gives me the following error.
Analysis: Time step too small; time = 3....
- 43
2
votes
1
answer
67
views
Bias Voltage affecting op-amp at 0v
This question is a follow-up from the setup described here
Recap: I am designing a circuit which is intended to map a signal in the 0-5V range to the 1.75-7.0V range. To do this I am using an LM317T ...
3
votes
3
answers
123
views
Selecting appropriate Opamp for RRO applications
I am designing a circuit which is intended to map a signal in the 0-5V range to the 1.75-7.0V range. To do this I am using an LM317T voltage regulator in conjunction with a TLC2272 Rail-to-Rail opamp. ...
1
vote
1
answer
82
views
Opamp and regulator not behaving the same on breadboard vs SPICE simulations
I am designing a circuit which is intended to map a signal in the 0-5V range to the 1.75-7.0V range. To do this I am using an LM317T voltage regulator in conjunction with a TLC2272 Rail-to-Rail opamp. ...
1
vote
1
answer
99
views
OpAmp Offset Null Pins in LTSpice
I'm simulating the following circuit, where the Op Amp is an LM741:
The LM741 is an 8-pin device, and this design calls for using 7 of them. From the datasheet, here are the pin connections:
I have ...
- 13
2
votes
4
answers
555
views
Why doesn't my OP Amp comparator work in LTSpice? (AD8665)
When V2 > V1, Vout should output approx. 5.3V. When V2 < V1, Vout should be approx. 0V. But this op amp seems to always output 5.3V regardless what V2 is. What could be going on here? Is this ...
- 1,012
1
vote
4
answers
95
views
LTspice: triangle wave circuit not producing any waveform
I've implemented this circuit in LTspice from this Triangle Wave Generator tutorial.
Unfortunately, when I run the simulation, it doesn't produce a wave at all, just a flat VDC output. Any help would ...
- 111
1
vote
1
answer
81
views
LTspice - simulation of SPWM is giving unexpected result
I am trying to make SPWM with op-amps. I also made a simple NOT gate with a simple transistor.
The first op-amp is working well when its output is not connected. When I directly connect the first op-...
- 405
0
votes
0
answers
87
views
Why does one circuit work but not the other in LTspice?
Newb here having trouble. I have two identical circuits built in LTspice. Once works fine, and the one pictured here does not. Note the ??? marks on the drawing, they should be DC voltages. I know ...
- 652
2
votes
2
answers
83
views
Force Sensitive Resistor SPICE Simulation does not show voltage change
I have done a SPICE simulation on LTSpice to double check before I order my custom PCB. I want to graph the voltage change after the op-amp to see how it is affected once I press on the force ...
- 43