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61 Threads found on Opamp Measurement
"Peak Detector" circuit with a proper opamp may serve you.Look at for engineering bulletin or application notes
hi everybody. when I designed my opamp in output node Isaw this plot for phase of output where is the problem and how can I handle that? 135028
hello all plz help !!!!! hot to measure PSRR,cmrr ,slew rate and PD of cmos opam.....plz tell me.........:-|
How to design an opamp Circuit for pH Sensor which will be interfaced to PIC. The PH sensor gives 420 mV for 7pH and -420 mV for 14 pH. I need to design an opamp Circuit using 741 or LM358. How can I design the opamp Circuit. Further the output of the amplifier will be input to ADC of PIC for measuring the pH.
Hi, i would like to measure voltage level few tousends volt, - i thought to use opamp because of its high internal R but i am not sure about it. Can an opamp stand that high voltage? is it how people measure high voltage? - Do you know any IC or any circuit to measure dVce/dt and dic/dt? thanks for helps. Best regards
A zener diode won't do it. You need a comparator IC and a voltage reference (maybe a zener diode). You could do it with an LM10 (8-pins IC) and a few resistors since the LM10 has an opamp that can be used as a comparator and it also has an adjustable voltage reference.
Without negative feedback the finite offset voltage - together with the very large open-loop gain of the opamp - will drive the output into saturation, thus disabling any small-signal gain measurement. Fot this reason we provide dc feedback (which drastically reduces the dc gain) but in addition we use a capacitor for shorting the feedback signal f
If you are looking for Discrete semiconductor like Diode, IGBT, MOSFET BJT etc and some general purpose devices like opamp, Voltage regulators etc, one can use PSpice Model Editor. In this tool you can directly put value from datasheet to generate Spice model. If you are using 16.6 - with latest ISR you can use Modeling apps, these would further si
hi As you said we need to keep the opamp in voltage follower configuration and keep varying the resistive load until the voltage drops. what in the case of capacitive load,what should we do here in order to measure the output current? See for reference
You can have an opamp in a normal circuit work normally or have the same opamp in the same circuit with its output overloaded. An oscilloscope will show an overloaded output that is clipping and a meter will show lower than normal output level. You might think that the gain is reduced instead of seeing than the output is overloaded. You need to un
... is the final version of the schematic 107544 The current measurement system is not ok: 2.439V at the non-inverting input of OP-471A means there's a current > 5A flowing through R8. In this opamp's configuration, with a gain of 1+R10/R9, the opamp's output should show ≈17V , whic
rishab, the slew rate is an indication of the opampīs ability to follow a positive (or negative) step. Do you expect any influence of the time the input stays at the final level ? Hence, you can use any repetition rate of the step function (squarewave) - as long as the width of the step function is sufficient to allow the output to reach the
hello geeks, this is the first time i am designing a amplifier. i am using thin film sensor which has resistance in the order of 100's of mega ohm for ex 300M ohm. when it senses gas it resistance reduces to 100M ohm. i want to measure the variation of resistance in terms of voltage with micro controller. so i am using op amp for the same. what op
The opamp and microcontroller are both connected directly to the 230VAC which is a deadly danger. Isolation is needed. Voltage spikes on the 230VAC will destroy an opamp. An input protection circuit is needed. The input resistor needs to be made to use high voltages.
i want to know what is opamp's input offset voltage???? what are the reasons which causes it..... please answer me as soon as possible..... :-|
I wouldn't trust any measurement of input impedance from a simulator because: a) Most SPICE models are inaccurate. b) Input imedance can vary over a wide range for different opamps of the same type. Why not just look in the datasheet? Perhaps the background of the question is to investigate/proof HOW GOOD the m
Hello, Is R14 going to be OK for use as a loop injection resistor for feedback loop measurement? (attached schematic & LTspice simulation). Also, the opamp, U2 , is included purely for ensuring that the feedback loop measurement can be successful. (low impedance of opamp output is needed) That is, R14 and U2 (...)
Start at the beginning; forget about the microprocessor for starters. Then measure some points in your circuit. What's the voltage across that 100 ohm resistor? What does the signal out of the first opamp look like? (And I don't understand the point of that diode in the second opamp). How much ripple are you seeing on the output?
I am experiencing strange behaviour of AD8607. It should be pA biass current and uV offset voltage opamp, but simple voltage follower configuration shows this results: 95124 Error seems to be related to source impedance as it dissapears if I connect opamp input directly to voltage reference output (no potentiometer). But
Hi first, you should convert sine wave to a square wave with a simple opamp such as LM324 (has 4 opamp). Then you can count square wave using counter module in PIC micro-controllers. good luck HR Karami