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Hi, I doubt you have a floating point ADC.... Therfore I assume you get binary from ADC, and then generate floats in your software. I usually try to avoid floating point in a microcontroller. **** What is your display value range: * positive only? * largest positive value? * smallest positive non zero value? * Do you (...)
What is the expression for Vo??? Voltage created by the thermocouple is fed to the non-inverting input. (I cannot tell whether it is positive or negative, therefore I'm not sure whether the output is positive or negative.) It appears that the op amp is set for a gain of 100. Rg adjusts the output voltage up/d
1)Why db ranging mostly from 0 to negative? peak at 0 level and as it decreases it goes negative? why no positive? 2)noise floor in -155dBm/Hz what's dBm? why its over frequency? 3)why resisitity express in ohm-cm? why cm which is length? not not ohm-area? 4)what 's a epi versus non epi wafer?
Is the 324 wired so the output signal goes high when the input is above 50% supply? That's what I understand from the schematic. I don't use op amps much, but maybe the other way round is what you mean? - non-inverting to 100k divider and input to the inverting input, so when input below (not above) 2.5V, output goes high. Would it help to use
It might be possible if you can use a RRIO opamp in place of the 358. I won't draw a picture (no graphic sw on this computer), so bear with me. positive supply line to ground. Negative supply line to -12V. non-inverting input to ground. Signal to inverting input through a 1k resistor. A 10k resistor from output to inverting input. What happens is
What is a "difference" opamp? Do you mean an opamp circuit with a differential input? Next time please post a schematic of what you are talking about. Here is an opamp circuit with a differential input. It uses a positive and negative power supply so its input "bias" voltage is 0V. If the non-inverting voltage is positive then the output (...)
I need to power a op amp. An opamp does not need a dual polarity supply if it only has an AC (audio?) output signal. You simply bias its very low input current non-inverting input at half the supply voltage with two fairly high value (100k) resistors and a filter capacitor. Then its input, output and feedback ground r
Common base amplifiers are non-inverting and this one uses a capacitance divider feedback to the emitter for positive feedback at LC tank resonance with 0 deg phase shift. Thus oscillation is sustained when the loop has gain at resonance by ratio of Collector to emitter impedance at resonance. The Bias resistors control the dc current operati
All transistors have Miller capacitance which is from the inverting output to the input. In a differential amp , by adding caps by cross over ( From + out to + in and -out to -in ) from internal differential outputs, it tends to cancel the negative feedback with a lesser positive feedback with non inverting current or negative Miller Effect . Whe
There are different types of rail-to-rail opamps: some are only R-R on the output, some are R-R on both input and output. Many non-R-R opamps can go all the way to ground on the input, but not to the positive rail. You need to look at the specific op-amp to determine what it can do; they're all different. Some will just saturate if the input goe
Assuming a transformer secondary outputs only positive pulses and negative pulses, a single diode can be used across the secondary, so that only positive pulses are out. Is there any other non-semiconductor way to do it by using a second transformer or a special winding etc?
My personal preference is wiring each unused FET OP as unity gain buffer with non-inverting input connected to circuit ground.
... keep the same stage gain. I did try to use a non inverting op amp stage after it instead of two inverting stages but couldn't seem top get it to work correctly. After the tap of your poti you could do it with one opAmp and 4 equal resistors (say: 100 kΩ) , and a positive reference voltage of 7.
It's possible your zero offset has to be raised a bit, so that it will then detect a weak incoming signal. Although a single op amp has terminals built-in so we can adjust the zero offset, the quad 324 does not. So we must try a workaround. It ought to help if you were to apply a slight positive bias at the non-inverting input. That is what
The premise that V(inverting)=V(non-inverting) doesn't apply here. The positive feedback messes that all up. Look at it this way: The output is at VCC. Then the voltage at the non-inverting input is VCC(r1/(r1+rfb); call this V(ni). This means that the voltage at the inverting input must be greater than V(n1) in order to get the output (...)
Hei unateness is an attribute, for ex: when u give any input to an inverter its output will be inverted. It is said to having an negative unate. Similarly a buffer will rise when input is high and falls when changed to low. so it is called as positive unateness. whereas as dftrtl rightly pointed in a gate like xor if a value goes to 1, depending on
Can you post an S11 plot (on a Smith Chart with some frequency markers)? phase of S11 always >0 means that your antenna appears to be (somewhat) inductive over the simulated frequency range. This can be a combination of certain transmission line length and non-optimum match.
what is the difference between non causal and anticausal system.how could we differentiate both system with laplace transform
if you dont have model of those chips use the specs and design the variables and tolerances if resistor positive feedback on any 2 stage invertor or 1 non-invertor chip
1st schematic should be emitter follower out, non inverting with negative feedback, and pull down resistor. but Q1 may overheat if Vin = 80V @ 100mA 2nd schematic may be overkill and also has positive feedback (NG) I suggest you use LM317 with transistor to use ADJ-OUT 1.250V internal reg drop for constant current control. See chip App notes.
The function of the circuit depends on the internal resistance Rin of the signal source that is applied at the non-inv. input. For a pure voltage source (Rin=0) the positive feedback path is useless.
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 wchzym, in your second circuit, if the right terminal of R9b (or directly the non-inverting input) were at ground and the input voltage were applied to the right terminal of R8b (instead of grounding it) this would be a standard precision rectifier in inverting configuration. Changing the role of ithe two inputs (right terminals of R9b and R
Hi, For non inductive loads it is not necessary.
when ananotated with spef and write_sdf . tools report lots of warning : Warning : Fail to computer C-effective for the timing arc PAD-->DOUT (max-rising positive_unate) beacuse the library data indicates a non-positive drive resistance anyone can tell me if I can ignore these warnning?
There is heavy reason why it is inverted If the gate is non inverting it's easier to fall in self oscillating mode - during some tranition stages the input - output characteristic becomes as OpAmp with big amplification. Like result you can get much easier positive feedback and oscillations if the gate is non inverting. (...)
As from the ti web site: * LM339 VOLTAGE COMPARATOR "MACROMODEL" SUBCIRCUIT * CREATED USING PARTS VERSION 4.03 ON 03/07/90 AT 14:17 * REV (N/A) * CONNECTIONS: non-INVERTING INPUT * | INVERTING INPUT * | | positive POWER SUPPLY * | | | NEGATIVE POWER SUPPLY * | | | | OPEN
in this case, the significance is in making this a non-minimum phase system. Eg, the frequency magnitude response of (s+1)/(2s+1) is the same as (s-1)/(2s+1). But the phase shifts are different. the first case has a minimum phase shift, while the second case does not. This becomes very important for control systems. There will be no real frequ
whats the significance of positive feedback in op-amp based non-inverting integrators? please explain the functioning thank you
I think the schematic you are referring is: One Error Amplifier => PMOS. And the feedback path is connected back to non-inverting input of error amplifier. But you couldnt look at it and conclude it is positive feedback. If you look at whole system (Error Amp + PMOS), it is equivalent to Negative Feedback since there is one inversion throug
A four-stage differential ring oscillator always consists of three inversing delay stages and one non-inversing stage. For differential signal, the loop has a total 360 degree feedback at a frequency where the loop gain is above unity. So oscillation seems likely to happen. But for common mode signal, the loop can be regard as a positive feedb
For sinusoidal oscillators, you want the negative resistance to just cancel out the positive resistance in the rest of the circuit. If the negative resistance is too much larger, then the output waveform starts to grow without bounds. This amplitude increase will continue until some non-linear limit is reached. Typically, this limit is the power
oscillators are 2 types.. 1.sinusoidal 2 .non sinusoidal Colpitts and hartley all are sinusoidal osci which r based on bharkausen criterion Relaxation ,ring osci. are non sinusoidal..
Hi ! Any general purpose Operational Amplifier will help you. Try the easy to find LF411, TL071, even the LM741. Check the datasheets for circuits configuration, specially the non inverter amplifier (basically you enter your signal in the positive input pin, a resistor connecting the output pin to the negative input pin (it can be a potentio
ModelSim 6.5g ??? I see the same problem in ModelSim SE 6.2a. I also see a suspicious warning message: "non-positive replication multiplier '0'" The Verilog 2001 standard says this, so I think ModelSim is broken: A replication operation may have a replication constant with a value of zero. This is useful in parameterized code.
Hi I have designed an opamp with 5V power supply. when non inverting input is higher than inverting input the output reaches close to positive rail i.e. 5v. I want to design the opmap ( or use some other circuitry) such that the max output voltage doesn't exceed 2.5V. constraints are => power supply can't be changed and also gain of opamp shoul
Not sure about Pads, but, (assuming layer 2 and 3 are positive layers), almost all PCB design softs have the option to plot without non-functional pads, or you can have the pcb fab shop remove inner-layer non-functional pads - usually via a note on your fab drawing. SiGiNT
subtract a positive number from another, and use a sign extension format to represent the result, the msb is the sign bit. For example 0011-0010=0001 0010-0011=1001 Can this subtractor be implemented efficiently as a complementry subtractor? Regards!
Google for "non-inverting demultiplexer".
Hi purna, If you consider the signal with a convergence factor that makes the sinusoid decrease for both n positive and negative, for instance: x = exp(jω0n) exp(-alpha |n|), with alpha>0 then both ROC have a non-void intersection. You have a ROC that is a ring-shaped region around the unit circle. Now take alpha “small e
1. A negative plane is a plane that has uses "positive" data to represent non-copper. The gerber file is then inverted by the service buro that prepares the photo plots. Thus, such a plane data will be less bytes that a positive one. 2. A plated through hole has copper in it. This enables a copper connection from the top to the bottom (...)
Current references with zero TC is nearly imposible. Why? Because you always generate a current based on a resistor which has a finite non-zero TC. You can try making the resistor with two materials, one with positive TC and the other with negative one. Then, preview a triming mechanism and trim your circuit at the test stage.[/quot
I have been having a hard time to draw anything 3D that is not a standard shape. Like for example drawing a three D triangle. Ican make a 3D line but not sure on how to change that to a 3D object. I have read help files but no avail on that end. I tried using the planes to cut out either negative or positive side but it has not been that graet.
Hi, How do we actually detect rechargeable batteries from non-rechargeable batteries ? My focus will be AA size batteries (NiMH, NiCD, Enegizer Photo Lithium and Enegizer Alkaline). In order to implement a dT/dt fast charge termination, where would you place a thermistor ? which part of the body (e.g. positive terminal, negative terminal o
Hi Is the circuit an inverting or non-inverting amplifier with pos.feedback I think it an inverting one but I read in a paper that it is an non inverting pos.feedback amplifier. Who's wright??? Greetz E-goe
That will work fine, your output will be inverted so +/-10V to 2.5V -/+1. You can also place divider on non-inverting side +/-10 to +/-1 and set Rin = Rfeedback and put -2.5V at Rin.