Questions tagged [rail-to-rail]

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1answer
15 views

Is it possible to replace the ref pin of AD620A with a fixed voltage?

I am trying to implement the below circuit (from) without ADuC842, I will use Arduino mega2560 ADC. the circuit generates -5V to 5V rail to rail voltages for ad620a and they control ref voltage via ...
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5answers
115 views

Is exceeding Opamp Common Mode Voltage safe?

I understand that when you exceed an Opamps Common mode voltage limit that the output will no longer be reliable. And that this limit is often a bit less that the supply rails. But would slightly ...
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0answers
34 views

Why constant slew rate is important in entire Common-input range?

Almost rail-to-rail amplifier have different slew rate in 1~4V common-input and 0~1V (and 4~5V) common-input. (Of course this range can control in the amplifier. This range is just example.) So there ...
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3answers
131 views

How can I check in an OpAmp datasheet if the OpAmp is push-pull?

I am looking for an OpAmp which I want to use as voltage follower after a DAC. The OpAmp should be able to pull 3mA. And it should have Rail to Rail input and output. How can I check in a datasheet ...
4
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2answers
138 views

How does a common-emitter rail-to-rail opamp output stage work? Is there a discrete example?

I'm reading an article about how a rail-to-rail opamp works. The materials from Maxim and Analog Device all mentioned that, in a conventional operational amplifier, the output stage, in its essence, ...
0
votes
1answer
109 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
103 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
258 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 ...
0
votes
3answers
580 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 ...
0
votes
1answer
116 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 ...
0
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2answers
53 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
5k 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
91 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
1k 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
97 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 ...
0
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0answers
776 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
253 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 ...
5
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2answers
14k 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 ?...
0
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1answer
79 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
410 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 ...