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207 Threads found on edaboard.com: Low Offset
Can you please be more clear in what exactly IS the question? My question is what configuration I should use with my IL300 to use it as a current sensor. You mentioned that I should scale the current using a shunt since the input amps range for coupler is quite low, should I be using a variable resistor? How sho
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 some built
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 aren't a problem. (...)
Most resistor values are off feasible resistance range, the circuit can't work with the given dimensioning. You need particularly to consider available output current of LM124 and LMC3702. Also the input offset network is apparently not correctly calculated (besides too low resistance values). - - - Updated - - -[/
could I just use a transformer from mains and then rectify and supply to Vb as long as the transformer supply voltage is higher than the H-Bridge supply? No. Vb must be held at a constant 12 to 15 V offset (=VCC) above Vs, the diode is achieving this in combination with C2 in a regular half bridge configuration (low side drain conne
1. I can suggest you to use an OPAMP with very low input offset voltage (also known as Chopper or auto zero or zero drift. the name varies with manufacturer but the functions are same). Non of the OPAMP which is embedded into the microcontroller will suitable to interface your sensor (except Cypress PSoC controller wich is very much expensive compa
hi, I would like to sense the current from a path where a current of 50mA to 2 A is flowing to the load. Can I use simple differential amp with gain across the Rsense =20mohm or is there any contemporary design help. thanks
In order to prevent self heating errors,current shunts are typically 50mV full scale for 20A. But for 200A , I suggest 5mV drop for 1W dissipation. Then use low offset high CM Op Amp or special Current sense amp, Try to work around this instead. This means 250uΩ using wide strip for low inductance and good heat dissipation. The current (...)
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 "offset correction". In any (...)
I am designing a 4-20mA mosfet current source with power supply= 1.8v. with this power supply because of the large current passing through mosfets, I have to choose big channel width for the mosfet which have been used like 45um or 30um. I can reduce this amount using a power supply much more than 1.8v like 3.3v causing to increase the value of pow
Hi Guys, I'm looking at a design from TI, I noticed that they have used a cap and resistor on the transformer primary side, to eradicate any DC offset seen by the transformer. 128979 Documents Documents Schematic
An integrator uses maximum DC gain not unity , so it does not need to be unity gain stable. It does need to have very low DC offset. You may be confusing the fact that Op AMps are integrators with internal small compensation and are thus often unity gain stable. When they compromise compensation for bandwidth, unity gain stability is compromise,
The OP07 opamp you're using as a comparator is not very fast. Its main claim to fame is the low offset. I expect an SR flipflop will more than be able to keep up with it for speed.
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.
Unfortunately, the question can't be answered by applying datasheet information. Particularly no output impedance is specified, so you can't tell what's the maximum transverse current caused by buffer offset. I would expect that it's usually low. To be on the safe side, provide a series resistor option (0.5 - 1 ohm) and replace it by a short if
Having a high impedance and input current input load is good for low input offset voltage amplified by high gain. Ensure you calculate this effect in any choice of input DC termination to a reference voltage , be that 0 or V/2. Also allow for leakage effects from dust and moisture , which can often be << 10M in forced air environments and (...)
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.
Yes, You could add a DAC at the the node named Va in the above picture, you will have to add current sourcing DACs and current sinking DACs on both sides of the differential halves (at Va nodes) to be able to handle any kind(+/-) of DC offset occurrence. Another way could be to implement a high pass function in the path with a very low cut-off fre
There are many choices and tradeoffs; cost, thermal offset, GBW, Noise V, noise A, avilability, etc Define your requirements for SNR, Cost, impedance , offset, drift, etc. then rank importance and then choose. also LT6230 - 215MHz, Rail-to-Rail Output, 1.1nV/rtHz, 3.5mA Op Amp Family Features low Noise Voltage: 1.1nV/√Hz (...)
what if input < 0 or > 2V? Use 0.2V Diode OR logic analog input so highest voltage is detected, then All you need is four Window detectors with 3 comparators and logic to gate when Vin > Vx and Vin < Vy Or use LM3914 with 10 levels and active low side driver/selector out. offset input by 1 Diode drop to 0V then calibrate to your thresholds and