Parameter. LF LF LF///B. LF LF Units. Typ. Max. Typ. Max. Typ. Max. Typ. Max. Typ .. This datasheet has been download from. These are the first monolithic JFET input operational ampli- fiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar. These are the first monolithic JFET input operational amplifiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar.
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Email Required, but never shown. I tried a few values, and the highest I could go was 40Meg just on the brink of saturation: I am ‘injecting’ a voltage and measure the gain around the loop. It may not be proper to call such a circuit as an integrator circuit.
I’d really appreciate that whoever downvoted please explain what makes my answer wrong.
I used the LTpsice to simulate the feedback performance of a integrator circuit with op amp LF which is a L356 input op amp but I go strange results see the image below. Synthesized tuning, Part 2: You could modify the model yourself and make it better if its worth your time.
Post as a guest Name. Maybe the datasheet has the wrong plot, or the wrong schematic for that test, or maybe the model is wrong. If so, how to implement the integrator circuit with op datashet having mV EOS in practice?
Do those plots even look remotely close to you?
LF Datasheet(PDF) – STMicroelectronics
Also, the greater the value of this parallel resistor, the greater the dc gain to the offset and risk of saturation. Look at the location of the ac source now:. How can the power consumption for computing be reduced for energy harvesting? So if you have 0 Vdc at the input plus the ac signal, you should have 0 Vdc at the output plus the ac signal times whatever gain you have.
(PDF) LF356 Datasheet download
I think in the model, they use a value of 3mV for the offset voltage. But you want high gain at dc—not good with the offset. That arrangement makes both the input and output be at the same dc level and keeps the opamp in the linear region.
This is your circuit: Input port and input output port declaration in top module 2. I tried a few values, and the highest I could go was 40Meg just on the brink of saturation:. Datsheet ‘N’ just means it has a DIL package. May I ask you for what purpose you have a resistor in the feedback path?
I’m willing to bet they left it at that, from what I’ve seen in the past with other models this is usually the case. AF modulator in Transmitter what is the A? Now, this is a method a use sometimes, because it forces the dc operating point to be the same at the input and output this is similar to find the loop gain for stability analysis.
This material is intended for free software support.
They call it Datashet in the model file. Sign up using Email and Password. Since the offset dztasheet is so low compared to the LF, you see that even though the circuit still amplifies the offset voltage, it doesn’t get to the point of saturating the output and you get results as expected in the linear region. The problem, however, is that you already have a large resistor there kthat forces you to pick a value much greater so that at high frequencies the orginal feedback impedance still dominates.
LF356 JFET Op Amp IC
Heat sinks, Part 2: Look at the location of the ac source now: So choose an opamp with better offset specs is an option. What is a Discussion forum? I have seen similar issues in the past with LTspice and from my experience it comes down to the dc operating point. And this is finally the ac response for this setup: Hi sixcab, thanks a lot for your very detailed reply and it totally clarifies what I confused about LF