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Low Offset Amplifier

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63 Threads found on edaboard.com: Low Offset Amplifier
offset voltage and gain error terms need to support LSB accuracy. Bandwidth / settling time need to be well better than sampling rate, and settling time is to a very low residue error. You would have to design the amplifier for the worst case (max bits, max bit rate) or cases (if your scheme varies them independently or according to (...)
Presumed you are operating current probe correctly: - 50 ohm termination for probe amplifier - probe degaussed and properly locked You can expect better accuracy than worst case +/- 3%. At low current levels, offset and noise are the only expectable additional errors. Your measurement suggests that offset and noise (...)
Apparently the TINA LF444 model comes with 10 mV built-in offset. According to datasheet it's rather a worst case than a typical value, but not impossible with this cheap general purpose amplifier. A straightforward solution is to use a precision (low offset) amplifier instead of asking for (...)
Its datasheet is published by its manufacturer and it says the max gain (with all spec's) is 1000. Don't you believe them or do you want poor spec's? Simply add a cheap low noise opamp to its output. The extra amplifier does not need to be an expensive instrumentation amplifier.
140dB (!!) is a voltage gain of 100 million. Then an OTA with an input offset voltage of 5mV will produce an output of 500,000V when its input is zero! What about low frequency noise being amplified 100 million times? Don't be silly.
hi, Connect a 4K7 or 10K from LM358 Vout to 0V and recheck the Vout low. E
any method to design a low offset CMOS amplifer? Without the auto-zero and chopper, besides the large size of the transistors, any other way to realize low offset? Thanks, Shawn
If resistor values are high and board is uncoated, even relative humidity could make that kind of change. At such low input level, Vio drift and things like charge pumping of ambient 60Hz/120Hz hum could be at play. A copper box and a known-stable voltage meter might be a good thing to try. I see "520mV" and "530mV" as being a bit short of resol
Hai, I'm trying to interface a thermocouple to microcontroller. As the thermocouple produces very low voltage, I've given an INA126P instrumentation amplifier to amplify the voltage. I'm using +5V as V+ and GND as V- and Vref=2.5V. But, in the datasheet it says input common mode voltage is 1.5V to 3.5V (from graph). So, I tried to add an (...)
amplifier noise and offset voltage are the limiting factors. offset voltage matters in case you want to sense DC voltage. amplifier noise can be as low as ?V for MHz bandwidth down to nV for Hz bandwidth.
Hi, all How could I design a pretty low offset error amplifier (offset lower than 500uV)? Does it possible to using an autozero structure? Thanks
I have a doubt about passive filters in differential inputs. In low pass configuration I found this thread ( ) that tells me to use the RC constant as: R = R1 + R2 C = C1 But, if I want a high pass do I need to use the same idea or something like this: R = R1 C = C1 + C2 78990
Anything you can do to use symmetry on differential output, such as loads, current mirrors, CCBDI, will help reduce offsets. Use a balanced Wheatstone bridge config with an Instrument amplifier IC. They come in all kinds, but are designed for small signals, low offset, high impedance.
Why did you use an inverting amplifier, you have a low positive input and you want a higher positive output so a non inverting amplifier seems to be the proper solution. You should use a precision opamp that has a low input offset because your input level is low and
Hi All, For an op-amp which will be used as open loop comparator, How do we simulate and judge the performance of the op-amp which include the following items: 1. Input voltage range 2. Output High voltage Vs Output low Voltage 3. Output current source and sink capability 3 Input offset voltage 4. Frequency response ( Open Loop or (...)
Can anyone please tell me what would be a perfect alternative for LMC662CN used in this circuit. LMC662CN was used because it was found suitably designed for low current measurement,has ultra-low input bias current (2 fA maximum) and low offset voltage drift (1.3 μV/oC). But since I don't have a LMC662CN IC with (...)
Why do you need the adjustments? If you are measuring small voltages, use low offset opamps or maybe an instrumentation amplifier. Keith
Just use comparator to compare the two input signals for LDO error amplifier (output feedback voltage and reference voltage). If Vfboffset, comparator outputs a signal to pull low LDO power PMOS. Also another comparator (Vfb>Vref+offset) can be used for overshoot suppression.
You can also feed an offset voltage to the reference input. But it should be low impedance, e.g. buffered by an OP voltage follower.
I am thinking of using a precision low frequency op-amp to null the offset voltage of a wide bandwidth fully differential amplifier (LT6600) by sensing the closed loop offset voltage across the input terminals and driving a suitable correction current into one or other of the virtual earths to correct the (...)