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133 Threads found on Opamp Single Supply
hi, 1-why ADC op-amp use -5v 0v +5v supply power why not use single supply?? 2-the -5v 0v +5v connected to low voltage 3v ADC that's mean more op-amp gain can damage the high cost ADC ?
Hi, You didnīt specify input_voltage range. Iīd use a comparator instead of an opamp (Because it is desigend to be a comparator). And add some hysteresis. What comparator to use depends on your signal voltages, supply voltages, hystereis circuit and output behaviour. Klaus
Saw a few times, counterparalleled LEDs driven by the single output of a single-supply operational amplifier circuit. /-------------------|<|---------------\ opamp out >------ -------- gnd \-------------------|>|--------------- Second way, the (...)
You may use "Rail-to Rail" opamp instead of LM358
If you just want that the circuit works somehow, then you can use almost any other opamp. But if you want the same performance, then it might be difficult. Any opamp with input voltage range including negative rail and suitable output voltage range, TL072 e.g. won't work. Look for "single supply" or "rail-to-rail" OPs in (...)
135454 135455 1)Most opamp use nmos differential amp, but this one uses pmos. why? nmos is faster. 2)the third stage, buffer stage gain, and on the circuit, it shows 2 pmos(m8, m9). why? isn't it inverter is used as buffer? how's 2 pmos is a buffer?
The results with the single supply voltage depend on the output impedance of the power supply. The circuit you show feeds half of any hum and noise on the positive supply to the reference input of the opamp. Do it liked this:
Most single power supply opamp circuits DO NOT NEED a precision complicated circuit for a low resistance high current "virtual ground". Instead they use two resistors and a capacitor to make a "half the supply voltage" reference voltage for the opamp's high resistance very low current (+) input voltage (...)
Your bandpass amplifier has its (-) input floating high since it has no DC connection to the output of the opamp. Your bandpass amplifier has VERY gradual slopes and is almost useless. I simulated it with a single input instead of your differential inputs and my opamps have a dual polarity supply to simplify biasing. You (...)
Hello guys, a stupid and quick question I am checking tha datasheet of one opamp Rail to Rail which maximum VCC suplpy acording to this datasheet is +-22V. Is it possible to supply it between 0V and 24V or can i break it? I think that it is possible but i need to confirm this issue. Thanks in advance!
Most half-decent opamps have maximium supply voltages of 36V and 44V so 24V is no problem. They work well up to at least 100kHz. A 741 opamp was designed 47 years ago and has trouble above 9kHz.
An important specification for an opamp is the range of its useable input voltage. Some opamps have a limited input voltage range that might be 3V or more away from a positive or negative supply pin like a 741 opamp then if it has a single positive supply its inputs do not work if their (...)
If you apply a positive voltage to the (-) input of an opamp then its output will be saturated as low as it can go. The negative input of a linear opamp is used for negative feedback, not a DC voltage. The (+) input of an opamp is its reference voltage input and if it is at half the supply voltage and the (...)
The circuit does in fact a negative instead of the intended positive level shifting. Quite obviously, a single supply non-inverting amplifier can't process the negative input voltages corresponding to negative currents. A simple way to achieve a positive level shift is to use two resistors and a reference voltage. No OP needed
Some opamps like the LM324, LM358, TLE2141 and rail-to-rail opamps have inputs and an output that work down to 0V when the supply is only positive.
Hi, Thanks for reading my message. I am making a high impedance measuring device that measures input voltage in the range of 0v up to 34V. Now I generate 36V for the input opamp and this first stage is a 1x buffer. Is there an opamp solution that only needs a single voltage supply (3v3) and that can handle 0v-34v and has (...)
Why do you need a dual-polarity power supply? ANY AC opamp circuit will work with a single supply voltage if its (+) input is biased at about half the supply voltage and the signal input, output and feedback to ground parts are capacitor-coupled. Here is an example:
The 'scope photo you posted shows no DC voltages. Is the output of the opamp at about 0V? Then since it has apositive-only supply, the negative parts of the input are missing from the output. 1) The input DC voltage is 0.43V lower than the voltage divider on the inverting input so the opamp amplifies the difference 21 times and forces its (...)
ANY opamp works from a single polarity supply if its input is biased at about half the supply voltage.
The PNP transistor inputs of an LM358 dual opamp work perfectly when they are at the voltage of its negative supply pin so it can be a single positive supply inverter when it has a negative voltage to its input resistor. Its output goes as high as +5V only when its supply is about +6.5V.