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Results tagged with single-supply-op-amp
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user 20218
For questions about op amps that are marketed as capable of "single supply" operation. While all op amps can be operated with a single supply, op amps that are marketed as capable of "single supply" operation typically include an input common mode range and output voltage swing down to the negative supply voltage. Always use with the "operational-amplifier" tag.
2
votes
op amp single supply with nonlinear gain below 1 and start offset
A precision clamp circuit will do what you want. Consider this: -
U1 and U2 act as clamps. They clamp the signal at a positive level of V1 and a negative level of V2 (as shown in the little picture …
- 473k
3
votes
Accepted
Buffer OpAmp hitting high rail
The TL084 has an input voltage range that you are exceeding. Read the data sheet in section 6.5 and it tells you that the input common-mode range (when using +/- 15 volt rails) is typically -12 volts …
- 473k
2
votes
Can opamps marked as single supply be driven from a dual supply?
An op-amp has basically 5 pins; Input+, Input-, Output, +Vsupply and -Vsupply.
It doesn't know anything about mid rails until you connect signals to its inputs. That mid rail is usually set about hal …
- 473k
2
votes
Accepted
NTE941M non-inverting opamp has non-zero output with 0V input
Extracts from the NTE941M data sheet: -
Common Mode Input Voltage Range is typically ±12 V on a ±15 V supply.
This means that if one supply of the op-amp is ground (0 volts) then you must have yo …
- 473k
3
votes
Accepted
Is it possible to amplify AC signal with In Amp in Single Supply?
I believe that a in amp with a single supply, for example 5V and GND,
can not amplify negative signals because the power is not symmetrical.
Right? Or not?
Correct, this won't work. The full …
- 473k
2
votes
Should op amp reference terminal be connected to ground?
Question -- should pin 5 be connected to GND (ie, pin 4)?
It's hardly ever connected to pin 4 (-Vcc). This is more usual: -
If you are using a split voltage supply then pin 5 (REF) is, in a lot of c …
- 473k
0
votes
Multiple-stage op-amp signal distortion
You have an open circuit on pin 3: -
This will prevent it working but, there may be other errors.
You may also need to check the shutdown pin is driven to the power rail.
- 473k
3
votes
variation in source votlage is allowed in a constant current circuit?
Here's the circuit linked in the question: -
It uses an LT6231 op-amp and, the front page of the data sheet tell us this (inside the red box): -
I am seeing a variation in the load current as …
- 473k
2
votes
Accepted
Diff. Amplifier with Single Supply Opamp - Strange Behavior
The act of setting OUTA high lifts the inverting input of the diff amp high and forces a current into OUTB output. This will produce an offset error on OUTB's output.
If you look on page 6 of the DS …
- 473k
3
votes
Accepted
Single power supply for LF353N opamp
Op-amps are not inherently single or dual supply orientated. OK there may be a tiny majority of exceptions that have a "ground" or "0 volt" pin but the vast majority have a positive power pin, a negat …
- 473k
1
vote
Using a voltage follower to stabilize the ground in a single supply op-amp circuit
But I don't understand, why? How does the voltage follower stabilize
ground? And how in the first place is the ground not stable in the
configuration on the left?
It's quite simple. The circuit on t …
- 473k
3
votes
Accepted
I want maximum 5V output from an Op-Amp. Is it a good idea to use a supply voltage for the O...
You have two problems. Firstly, you are quite correct, the output voltage achievable from a 5 volt rail is limited to circa 4.25 volts with a 1 mA load and, to improve this you can raise the positive …
- 473k
2
votes
Can I use an LM324 voltage follower with a single supply to rectify an AC signal?
This device can do what you are suggesting: -
As you can see it's an inverting unity gain amplifier that has a common mode input range that includes ground but, importantly it can stand an input vo …
- 473k
2
votes
What happens to the maximun operating ratings when the device is unpowered?
The absolute maximum ratings for current into the op-amp's inputs states 10 mA and here's where this helps. If you don't feed the output of the CT directly into the op-amp input pin but instead, feed …
- 473k
3
votes
Accepted
Why does this single supply non inverting Op-Amp saturate?
Look at this extract from the TL082 data sheet and learn: -
The input signal is invalid if it gets close to the negative rail (within 3 volts). The negative rail is 0 volts in your circuit hence an …
- 473k