Questions tagged [non-inverting]

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1answer
39 views

Floating input in Op-amp Readout Circuit?

I was analyzing this circuit diagram in a thesis about a capacitive EEG electrode. The author talks about a flaw in the design where there is a "floating analogue input" that is causing the op-amp to ...
5
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3answers
875 views

Non-inverting amplifier ; Single supply ; Bipolar input

I am working on the non-inverting amplifier using a single supply, which can amplify bipolar input signal. Non-inverting amplifier is working fine without any issues, only the negative portion of the ...
2
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3answers
95 views

How to add a low pass filter to this non-inverting amplifier circuit?

I've come up with this simple circuit as an amplifier before an 8bit ADC which receives audio signals. R2 is actually a variable resistor (pot.) of 100k. The circuit also biases the signal to VCC/2 ...
3
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2answers
166 views

Gain of Non-Inverting Amplifier Does Not vary with Resistor Values

I am trying to build a non-inverting amplifier using a LM7171 op amp, and I am implementing it with potentiometers as Rf and R2 so that I can smoothly control the gain of the amplifier (and easily ...
2
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1answer
63 views

Why is CMRR effect multiplied by gain in this non inverting op amp configuration?

In this document Vout of a non inverting op amp is given as follows: But why \$\frac{V_{in}}{CMRR} \$ is also multiplied by the gain? I would write it as: \$ V_{out} = \big[1 + \frac{R2}{R1} \big] \...
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2answers
40 views

Strange behavior in a non-inverting op amp

I've designed a simple non-inverting amplifier to interface a 3.3V MCU and a 5V signal to a motor controller. When I first tested with the MCU and the desired values to the low-pass filter, I noted ...
1
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2answers
177 views

What is the difference between these two op-amp circuits?

I don't understand why when we design a proportional amplifier, the feedback has to be negative. When I run the simulation in simulink I get the same result for both circuits.
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2answers
57 views

Is it possible to suppress oscillation at reactive load (non inverting amp)

I am using a non inverting amp with B class voltage follower to drive a piezoelectric transducer (used as sonar for fish scanning in boats). I am using trains of 20 sinewave pulses (85KHz), like the ...
0
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1answer
57 views

Whats the gain of this op amp?

what i did here is take current over the 4.7 kilo ohm and since there are no other voltage input other than the one then shouldn't the Vout be 0.2127 volts? thats not possible for a non-inverting ...
1
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2answers
89 views

Why my non-inverted amplifier does not work?

I'm trying to use a TL081, for which I used a DC power supply regulated by MPL1303, to feed the TL081 and a Vin from a DAQ assistant giving an analog signal of 0 to 5 V. I tested the signal from the ...
0
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1answer
175 views

Application of offset voltage to non-inverting input of the op amp

When we analize the effects of the offset voltage at the outlet of an amplifier configuration, we consider that this voltage is applied to the non-inverting input. At least it appears so in all the ...
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2answers
115 views

How do I determine the purpose of this op-amp circuit?

I have this circuit and I was asked to determine V2=f(V1) and V3=f(V2) which I determined below. The next step is to figure out what the purpose of this circuit is but I'm not sure how to do it from ...
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1answer
168 views

Voltage Amplifier using Op Amp 741 [duplicate]

I am trying to build an amplifier using op amp 741. But I am failing to build it on breadboard. I am connecting the positive end of a 9 V battery to pin 7 and negative end to pin 4. As per my ...
1
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1answer
166 views

Non-inverting op amp problem

I have problem with an lm386 op amp in an non-inverting configuration. For the resistors, I take two equal resistors so i set a gain of 2. When i put a signal of 3.3 volts on the non-inverting pin, i ...
1
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1answer
66 views

Fluctuating Non-inverting opamp o/p

In the non-inverting amplifier shown below, when the DAC output (TP1) is held constant at 2.5V (same input code), the OP213 opamp output (TP2) fluctuates between 8.750 and 8.775V i.e., roughly 25mV. ...
-1
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1answer
144 views

Non inverting amplifier oscillations [closed]

The point of this circuit is to take a 300 to 400 kHz 5Vpp square wave signal and convert in to a sinewave of the same frequency amplified with a gain of 2. The filtering before the op amp seems to ...
0
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1answer
56 views

Solving for adding a voltage to eliminate the non-ideality of the op-amp

The circuit as shown above. Conditions known: The op-amp is nonideal. Both inputs have current flow, lets say 0.7 \$\mu\$A. Only \$R_F\$ is known, which is 450 \$k\Omega\$. Open-loop gain is high. ...
0
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0answers
333 views

Non-inverting Lowpass Filter with Capacitor in Feedback

I am looking for a circuit that I expected to find everywhere but I don't. The "active" lowpass filter I often see in the web uses an RC filter with a buffer in series. simulate this circuit – ...
0
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2answers
132 views

Resistor in the inverting terminal of the op-amp

I was studying the gain of an op-amp in both inverting and non-inverting configuration. In case of inverting configuration, the resistor is in series with the applied AC voltage. But in case of non-...
0
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1answer
28 views

Non-inverting amplifier input voltages are different, related to limited output range?

I'm calibrating a pressure sensor and recording output voltage with an Arduino and the non-inverting circuit (recommended in the sensor manual) shown below. Without a load on the sensor (R_flexiforce),...
4
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1answer
193 views

Non-inverting op-amp circuit with gain = 1

I am preparing for an exam and I have a problem with the following exercise (hope my translation is good enough): We have an op-amp circuit with gain \$G=+1V/V\$ for AC signals and \$G=0V/V\$ ...
0
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1answer
131 views

Interfacing Raspberry Pi to GE NetworX NX-8V2

Much like this question, I am trying to interface a Raspberry Pi 3 Model B to an alarm system, but this time is is a GE NetworX NX-8V2. I have snooped on the control box with a voltmeter and it looks ...
1
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2answers
354 views

Problems with a non-inverting op amp configuration when input voltage is too low [duplicate]

I currently have a very simple op amp circuit for a non-inverting amplifier, using a UA741 with the gain set as 2. I have a sensor that outputs 0-2.3V and I'm attempting to amplify it up to 0-4.6V. ...
0
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1answer
190 views

Design a circuit using 1 ideal op amp whose output is Vo = VI1 + 2Vi2 - 9VI3 + 4Vi4

So, I've been staring at this problem for several hours now. I've watched videos on summing amplifiers, and the like--but nothing seems to show how to use 1 op amp in a circuit that acts as both a non-...
1
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2answers
87 views

Input Impedance of Noninverting Amplifier

I simulated a simple noninverting amplifier using an operational amplifier in LTspice and i was wondering about the input impedance. The input impedance of a noninverting amplifier should be the ...
0
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1answer
160 views

Do you know how to add VEE and VCC power strips to op-amp in Cadence that will be fit for simulation?

This is the built in Cadence OPAmp. I need to add A capacitor to the VCC wirep and Ground the VEE wire however, there is clearly not a VEE or VCC on this op amp. Also, I know that I could manually ...
1
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2answers
111 views

Calculating voltage at non-inverting input of the op-amp

I am asked to calculate the voltage at the non-inverting input of the op-amp if v1=4.78V and v2=0v. I thought that the answer would be zero, as the voltage at the non-inverting input must be ...
3
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2answers
426 views

Scale and Shift Analog Voltage with a Single Op Amp?

I am looking to map the output voltage from the onboard DAC of an Arduino Due from its raw range [+0.54V --> +2.75V] into the new range [-10V --> +10V]. I will use an op amp with -12V and +12V power ...
0
votes
1answer
48 views

How to calculate the feedack resistor in this configuration

I try to simulate the input stage of the ADC feeding circuit. ADC is 0-3.3V. The circuit: The Vin input signal: The output: The signal is shifted properly but the gain is lower than I expected. ...
-1
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1answer
106 views

My non-inverting amplifing circuit is always giving constant output values

I need to amplify voltages from range of -5mV/5mV to voltages of range -5V/5V. So I used circuit from the image. LF356N I decided to check if it is working by connecting it to Arduino Uno to simulate ...
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2answers
518 views

Resistor Between Voltage Reference and + Input of Op-Amp? Why?

something I commonly see in schematics which include op-amps set up as inverting amplifiers is the inclusion of a resistor between the non-inverting "(+)" input of an op-amp and a strong voltage ...
0
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1answer
91 views

Non-inverting OP Amp supply

I want to amplify a voltage range (from 0.54 mV to 42 mV) in below circuit which the gain of the Op Amp is 10x, so the Vout will be (5.4 mV : 0.42 V) .. and this Vout will be a Vin again in another ...
0
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2answers
288 views

Non-Inverting Op-Amp noise on the output when touched

I am using a non-inverting op-amp circuit (shown below) to linearize the output of multiple analogue force sensors. This is the circuit recommended by the manufacturer in their electrical integration ...
1
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1answer
334 views

Simulating ADL5536 Gain Block with Ideal Amplifier

I'm trying to simulate the ADL5536 Gain Block in LTspice. A link to the datasheet can be shown below: http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5536.pdf Analog Devices ...
-1
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2answers
314 views

Generating 0-10V DAC from 0-5V uC output - Non Inverting Amplifier or VCA?

I want a 0-10 V DAC output but my MCU only has a 0-5 V DAC output. I can't decide which option to go with: Use a Non-Inverting Amplifier circuit (like in the DS3904 Example) OR Use a voltage ...
0
votes
1answer
160 views

Making block diagram of an op-amp configuration

Hi everyone, I have to make the block diagram of the above configuration. Supposing the input capacitance of op-amp Cin, I've drawn this: A is the open loop transfer function of the OPA. B is the ...
0
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1answer
46 views

to design a 2nd Order Sallen-Key HPF

I am having trouble solving the following exercise. I am having trouble with the damping constant as you can see. It is giving me a gain less than 1. I am following my course notes but can't solve ...
1
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0answers
140 views

Issues with non-inverting op-amp Pspice sim

I want to build the circuit pictured here in Figure 1: When I simulate it, this is the result: For some reason, the output of the op-amp is always 183.8mV and if I work backwards using the ...
0
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0answers
53 views

Ripple on input of Buffer, Non-Inverting

I am using M74VHC1GT125DT1G a non inverting Buffer IC. See attached image . I have capture input and output waveform,problem is even when my input is constant high the output is switching. MODEM TS ...
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1answer
136 views

What will be the output of opamp non inverting amplifier at 0v input

I have a doubt regarding an opamp non inverting amplifier. I am using a dual opamp AZ4580MTR. One opamp is configured as a non inverting amplifier having gain 2 and the other is a voltage follower. ...
0
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0answers
192 views

Finding the frequency of opamp to get a specific voltage gain

In the following question, they ask for the frequency at which the gain would be 1.41 V/V. The dc or low frequency closed loop gain is 2V/V (6 dB). Is the solution of the following question done ...
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2answers
776 views

Voltage follower circuit gives a square wave rarther than a sine wave

simulate this circuit – Schematic created using CircuitLab I have created my voltage follower circuit as shown above. But when I connect an oscilloscope, it shows me a square wave at the output ...
2
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2answers
396 views

How do you use Gain Bandwidth Product to estimate bandwidth at different gains?

I was doing a question related to the dependence of op amps on frequency.This question is from 2nd year electrical engineering micro electronics by sedra smith. Here is the question: So there is a ...
1
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1answer
66 views

I am stuck at a question (about bias current and offset voltage)

So I was doing the following question from sedra smith microelectronics: I have managed to do all parts in the question except part d. I am stuck at part d. The way I have tried is the following: ...
1
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2answers
391 views

The gain of a non-inverting op amp

I was attempting the following problem. In the question it says there is a non inverting amplifier with a feedback resistor of 100k ohms and a source resistor of 5k ohms. If I use the regular non-...
0
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1answer
618 views

Photodiode non-inverting amplifier circuit

I am a Masters student currently working on a project of a two-axis moving structure that will scan the sky for diffuse irradiation. The sensor I am using is a silicon photodiode SP1110 from skye ...
0
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1answer
2k views

Confusion with output impedance of non-inverting and inverting opamp circuit

I'm trying to understand why the output impedance of non-inverting and inverting opamp circuit is almost zero. I found the following text on the derivation: β is the closed loop gain above. But I ...
0
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2answers
1k views

Current Sensing with Non-Inverting Amplifier

Hello, I'm implementing a current sensing circuit as shown in the schematic. The simulation works but the physical circuit does not. On the breadboard if I measure between the shunt and the load to ...
0
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2answers
220 views

Bias voltage of non-inverting op amplifier drops to 0 when input signal connected

I am working on a non-inverting opamp amplifier, using OPA2134, to amplify the 150mV peak signal (1 kHz sine wave playbacked) from a phone audio jack to ~4V peak sine wave, that drives a LED using a N-...
0
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2answers
709 views

Simple UA741 inverting amplifier not Working

I'm building a simple non-inverting amplifier using UA741,The gain should be of about 11,and the input is 500m v dc so the output should be in the range of 5.5 volts however i'm getting about 0.45 ...