Questions tagged [rail-to-rail]

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1answer
76 views

Is it a Rail-To-Rail opamp?

I ordered several LMC6482IN opamp without reading the datasheet details! I want to measure high side current with mA accuracy, for that I need the opamp output to go all the way to ground 0V. in the ...
2
votes
2answers
88 views

High voltage op amp rail generation

I'm using two ADHV4702-1 high voltage op amps for a project. They are configured as a current sink with a class B output amplifier (with some fixes for the crossover distortion). I already have a +/-...
2
votes
1answer
129 views

What is the difference between differential rail-to-rail, push-pull rail-to-rail and rail-to-rail OPAMPs

I'm loking for an rail-to-rail OPAMP to my project. I need a OPAMP that fed by a 12V and a -5V power supplies can generate an output voltage near these values, at least, near the positive 12V, the ...
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3answers
423 views

How can I determine whether this is a “rail to rail” opamp from its datasheet?

I know that rail to rail means that the opamp output can have a swing upto its power rail voltages. So for a rail to rail opamp lets say if the supply test condition is +-12V, I would assume that the ...
1
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4answers
2k views

Are there any single supply OP amps with negative supply voltage?

I learned that basically the only difference between a "single supply" OP amp and a dual supply one is that the former can drive much closer to the negative supply rail. Furthermore if I understand ...
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1answer
109 views

Loud hum and buzz… I think I know why but I don't know how to solve

First, read this other question of mine. I have modified the amplifier, as suggested by τεκ to run on the full rail. This is the modified circuit. Notice how the amplifier ground is tied to -5 and ...
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2answers
51 views

Truncating negative results of Op amp by rail limiting

I have a signal that will swing from -5v to 5v. I am interested in the 0 to 5v part only. I will set a reference voltage and give it and the signal into a comparator. The comparator's rails are 0, and ...
1
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2answers
4k views

No amplification with LMV358 compared to LM358 in crude current sensing

I am trying to build a current sensing circuit (two channels), with no requirement of precision (i.e., is current passing over some threshold whatnot). The (somewhat generic) circuit I am implementing ...
2
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1answer
82 views

Comparator circuit undesirable fluctuations

I have designed a comparator with hysteresis and rail to rail operation and my output depicted in figure1.The inputs of the comparator is a sine wave signal and a triangular waveform as shown below....
4
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3answers
915 views

How do I see if an op-amp is rail to rail using only datasheet?

If I have a data sheet or part of it, how can I see if an op-amp is rail-to-rail using only the numbers? For example, only using the image below, how can I see if input and/or output is rail-to-rail?
2
votes
1answer
95 views

Rail to rail amplifier analysis problem

Can someone help me to understand what we expected in the output(Voutn,Voutp) of the circuit of figure 1?I have searched for months a lot of books but I can't understand the operation of the rail to ...
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0answers
649 views

How can i brake/stop a stepper motor vertically

I have a stepper motor mounted vertically on a rail (rack). That can rise and fall vertically and stop on certain position in height on this rail. My problem is that when my stepper motor stops, it ...
1
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3answers
1k views

1-5V to 4-20mA voltage drop problem

I'm hoping someone can help me remedy this problem (or at least come up with a temporary solution), as I am a novice in electronic circuits. The below circuit shows my setup. Vin is my input signal ...
1
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2answers
246 views

LMC6062 Jumps too Rail when 1V below

simulate this circuit – Schematic created using CircuitLab I'm using a precision OP AMP LMC6062AIM as a buffer (Voltage follower). The supply is +5V and GND. The INPUT is a DC voltage (no ...
3
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2answers
10k views

What does mean a rail to rail output opAmp?

Context : have a very similar problem to the one exposed here, and in the best rated answer (by Olin Lathrop), he says we need a rail to rail output opamp. My question : What is rail to rail opamp ?...
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1answer
77 views

How to understand rail to rail input circuit?

I watched an input circuit for ground rail as follows, Why do I have to place a current source here? If I place a resistor instead, there will still be current flowing in emitter-base direction for ...
2
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2answers
395 views

What OP AMP spec should I be checking to assure this behavior

Recently, on the advice of others on another thread, I tried to migrate a dual supply OP amp circuit to single supply version. I needed a quad OP AMP, and the logic was that since my final circuit ...