Questions tagged [inverting-amplifier]
Anything related to inverting amplifiers, i.e. amplifier circuits whose output is an amplified replica of the input but which exhibit a 180° additional phase shift.
233
questions
2
votes
3
answers
290
views
Voltage Buffer Vs Impedance matching
I am designing an Amplifier circuit for the microphone. For this, I am using a buffer in between two stages for isolation and I am confused between 2 circuits. I know, in voltage buffer circuits, the ...
- 31
-3
votes
0
answers
37
views
Design a DAC for 4 bit binary input using non inverting amplifier [closed]
Design a DAC for 4 bit binary input using non inverting amplifier
I hope that the drawing will be done through the multisim application
- 1
1
vote
1
answer
138
views
Why is the opamp's inverting input not at virtual ground?
I've have been trying to make a current to voltage converter using a transimpedance amplifier circuit. I have been simulating the circuit in LTspice and everything seems fine, but when I built the ...
9
votes
4
answers
2k
views
What is the purpose of including (or excluding) the output resistor in the feedback loop of an op-amp buffer?
I have often seen (and made) circuits like this. It is a simple inverting op-amp buffer, plus a small current-limiting output resistor to protect the the op-amp if the output is shorted.
simulate ...
- 223
0
votes
1
answer
98
views
How can I calculate the gain of this high pass active filter?
This is the circuit I'm trying to make:
This is the circuit I made for simulation in Proteus:
These are my measured values as a result of Proteus simulation.
This circuit is used to measure the ...
- 23
2
votes
1
answer
66
views
Components Used in an Opamp Circuit Measuring AC Voltage
Why do we use this capacitor in the opamp and why do we superimpose it on the DC voltage and then destroy it again with the capacitor?
I got some answers here, but as @SamGibson pointed out, I opened ...
- 23
0
votes
4
answers
201
views
Why do we use this capacitor in the opamp and why do we superimpose it on the DC voltage and then destroy it again with the capacitor?
I am interested in the ZMPT101B circuit and there are a few things I cannot understand.
This circuit is designed to measure AC Main voltages between 50Hz and 80-250V and to be read from an MCU like ...
- 23
2
votes
4
answers
256
views
Conception of an inverting op-amp with a specific gain
Consider the following circuit:
Consider the input voltage is \$v_1 = 0.1 \sin(\omega t) \$ with maximal current \$ 5 \mu A \$. I am asked to manipulate the circuit such that the gain is of \$ A_v = -...
- 1
2
votes
0
answers
83
views
OpAmp Selection | Sine Wave Amplifier: 30 MHz, 30Vpp with 15V offset
I am currently working on amplifying the output sine wave of the TG5011 professional signal generator. Below are the specifications for the amplifier I am aiming to create:
Power Supply: A single ...
4
votes
3
answers
191
views
Fullwave rectifier with active clamp
What is wrong with my simulation? I am simulating with LTspice the following circuit taken from "Art of Electronics 3ed"
where my LTspice model looks as follows:
What am I doing wrong as ...
- 111
0
votes
1
answer
148
views
In testing this op-amp, I always get same amplification. Did I break it?
I bought these TL072 (maybe TL072CD) IC amps, for a circuit I was trying to build, but the circuit wasn't working at all so I tried to troubleshoot the amp.
I built a voltage divider ~1/1000 (on the ...
- 13
0
votes
3
answers
104
views
Inverting Amplifier
In the Figure shows what is the function of 𝑅0 and determines its value when
V0 = −3V1 − 2V2.
0
votes
0
answers
39
views
Is it feasible to model a CMOS inverter as a control system?
I have some knowledge of basic control theory from a course I took this summer and I'd like to use it to model CMOS circuits for an independent study project with one of my EE professors this upcoming ...
-1
votes
1
answer
61
views
About working of Opamp and making a potentiostat
Iam trying to make a potentiostat for cyclic voltametry of molecules, using op-amps, arduino board, and LabVIEW program.
Here is the circuit,from paper of journel of chemical education.https://pubs....
- 1
3
votes
1
answer
238
views
Virtual ground not close to ground in a current to voltage converter
I was hoping to get some feedback on a circuit I'm building. The schematic is as follows:
Some description: This circuit essentially functions as a constant AC voltage source with current booster ...
- 51
1
vote
4
answers
166
views
Why does the current not divert in the inverting summing amplifier circuit?
Why is the current drawn from different sources in this circuit not diverted to other resistors? Why does current only flow through the Rf resistor?
0
votes
1
answer
46
views
I want to implement a 2-active crossover circuit with LM833 and amplify it using LM386 and now the problem is I couldn't understand the circuit [closed]
I can understand up to certain level that we used a buffer, low pass filter but I can not connect with circuit and coming to components we used 120 Ω, 6.8 nF for active crossover with power supply + ...
1
vote
1
answer
123
views
Difference in inverting and non-inverting integrator
I am trying to simulate the step response of an inverting integrator and a non-inverting integrator.
However, in the inverting integrator's output (blue plot), I see an initial overshoot in the ...
9
votes
3
answers
874
views
Is it misleading to say a common emitter amplifier is “out-of-phase”?
I now understand that a common emitter amplifier produces an inverted amplification. I am asking this question because for a bit, I was hung up around the frequency with which I heard it explained as ...
- 193
0
votes
1
answer
115
views
Decrease in bandwidth of inverting opamp
The bandwidth of inverting opamp is lesser than non-inverting opamp. If both configurations have equal closed loop gain and also Gain-Bandwidth product (GBW) for opamp is constant for both cases (...
- 383
0
votes
0
answers
43
views
stages vs. frequency analysis of ring oscillator
I am currently working on ring oscillators and have stumbled across the following doubt.
Upon practical analysis of CS-amplifier based ring oscillators on hspice(the not gates are comprised of CS ...
- 21
6
votes
3
answers
1k
views
What's the point of Vcc and Vee closed loop in op amp inverter
I am trying to explain circuit in details, but I can't understand why do we even connect Vcc and Vee or V+ and V- in these inverting amplifier by C3 capacitor.
- 71
11
votes
4
answers
2k
views
Inverting op-amp problem
Down below is an inverting op-amp circuit with a capacitor C connected to the non-inverting input. I have to find the voltage at point A and express it using vin, C and R.
I tried to solve the ...
- 407
1
vote
2
answers
64
views
Inverting op-amp unexpected voltage shift
I'm trying to create an op-amp circuit that attenuates a 5 V input signal down to a 1 VRMS Vout signal (1.414 V Vout).
I need to shift the output signal by 2.5 V so that it can be fed into a unipolar ...
- 13
1
vote
0
answers
36
views
Control scheme to regulate Vin using a Buck regulator
I am trying to create a control scheme that allows a buck regulator to regulate its input voltage instead of its output voltage. I'm trying to make an efficient shunting regulator. My current approach ...
- 11
1
vote
1
answer
99
views
Why isn't my output voltage fully amplified?
I'm trying to design a circuit with A_v = -20, a swing of +/-2 V, an input resistance of 5 kΩ, and a corner frequency of 3 dB at 100 Hz.
I did the following calculations to get R_E1, R_E2, R1, and R2. ...
- 11
4
votes
3
answers
403
views
How does this rectifier work, since the op-amp input is 0 V?
Consider the rectifier below. Both inputs for the op-amp are 0 V. There are two diodes, that only allow current if the potential difference over them is above 0.7 V. Also, V1 is a sinusoid.
I don't ...
- 989
3
votes
3
answers
542
views
About "Always inverting except when you can't" of OPA
Recently, I read here:
Always inverting except when you can't
Always adopt inverting, the reason for which is that noise can be reduced.
Why? Could anyone explain in detail?
I also have a problem.
...
- 651
2
votes
3
answers
395
views
What is the purpose of this op-amp topology?
I have encountered this topology.
As you can see, there is a constant 3.5V voltage source connected to the non-inverting op-amp input.
It's clear that this is an inverting op-amp ampifier but I couldn'...
- 543
2
votes
6
answers
263
views
Why can we deduce certain voltages from the op-amp?
I am learning about ideal op-amps. One of the main characteristics of this device is the infinite open loop gain, which means that we can deduce that the 2 input voltages are the same as \$v_2-v_1=\...
- 211
9
votes
2
answers
474
views
Unwanted DC offset at the input of inverting op-amp
I'm designing an envelope generator for a sort of mini synthesizer I'm currently working on. I want the envelope signal to evolve (rise or decay, depending on the SPDT switch) only when the switch (...
- 127
4
votes
4
answers
473
views
Block diagram of inverting amplifier
I want to draw the block diagram of a generic inverting amplifier.
simulate this circuit – Schematic created using CircuitLab
Question: What is the actual block diagram for an inverting ...
- 3,891
0
votes
1
answer
112
views
UPS for battery with minimum quiescent current
I am powering a PIR sensor which has minimum 3.4V of VCC and 70µA supply current with parallel Li-ion batteries and I want to switch on a boost converter when battery voltage goes below 3.5V. But the ...
- 539
0
votes
1
answer
155
views
How to calculate voltages in op-amp circuits?
I don't know how to solve the following problems; I don't even know what the best way to start solving them is.
Can someone help me with the calculation steps so I can then try to solve them on my own?...
0
votes
3
answers
418
views
How to correctly measure the bandwidth of an amplifier with gain from its bode-plot?
I have an amplifier with the following frequency response:
It is an inverting amplifier with a gain of about -12. I would like to know what would be the correct approach for identifying its bandwidth....
- 23
0
votes
2
answers
133
views
0 dB Bode plot as a reference in an academic paper
I want to compare the calculated bode plot of an inverting op-amp with the simulated one, on the 1 mHz-200 kHz spectrum.
As expected, theoretically there is no stray capacitance on the circuit above, ...
- 437
2
votes
0
answers
338
views
How to choose component values for a JFET common-source amplifier?
I am trying to design a simple common source jfet amplifier using a J109 transistor.
I'm using the J109 datasheet and equations from the book Electronic Devices by Thomas L. Floyd.
The issue is that I ...
- 63
0
votes
1
answer
49
views
Dupicate LFO Signal and Invert, keeping MAXs and MINs
Im working on a Dual LFO with "Depth" and Rate controls. I already got the "root" LFO signal working and if I do this, I can generate the LFO swinging from 0v to 9v... and with ...
1
vote
0
answers
281
views
Designing a guard ring for a transimpedance amplifier
I am at that stage of a PCB design where I need some guidance on guard rings.
The Application:
The application is a photodiode circuitry (using a pin photodiode and transimpedance amplifier.) The ...
- 161
5
votes
3
answers
769
views
Why does the thermal noise of this large resistor not contribute to the input noise for this JFET-input inverting amplifier?
I'm interested in building a low-frequency, low-noise, AC-coupled preamplifier (mostly for measuring the noise of very quiet linear regulators). Several existing designs that I've seen use a matched ...
- 1,033
0
votes
3
answers
259
views
What type of op-amp configuration is this from a PLL circuit?
Can someone help me to understand this attached op-amp model? We are using it in an HMC3716 PLL circuit. We don't know how it works, exactly.
Is it an integrator or a differentiator?
- 19
3
votes
2
answers
751
views
High output impedance piezo guitar pickup is better attenuated by a shunt capacitor than an inverting opamp attenuation circuit
The circuit below is meant to attenuate a high output and high output impedance piezo electric guitar bridge pickup -7 dbV. The circuit models both the pickup output impedance and load of the cable ...
- 55
5
votes
5
answers
1k
views
How to find the gain of an inverting amplifier in terms of feedback?
I have been struggling to answer this question from The Art of Electronics where it asks me to find the closed loop gain of a non-inverting amplifier in terms of feedback and says that the derivation ...
7
votes
5
answers
676
views
Amplifier with selectable inversion?
Two inputs:
Signal: 0-5 volt analog voltage
Direction: Standard TTL logic
Output: A single analog voltage from -10 to +10 volts
When Direction is low, the Signal is amplified and inverted, so that ...
- 213
-1
votes
2
answers
96
views
Can you help me find gain of amplifier
I need to find the gain of this amplifier, but I am confused what should I do. My attempt says answer is 1.6.
0
votes
0
answers
73
views
Shunt both op-amp input terminals individually
I'm working on a lab project for my class. My manual says that I need to shunt both OPAMP input terminals individually with resistors Rx = 1kΩ.
I'm not sure what that means.
Where should I put the ...
- 1
2
votes
2
answers
208
views
Why is this voltage "negative" in this simple BJT circuit polarization?
A question about this circuit was posted and immediately deleted.
It is a simple circuit, but I found this when I simulated it.
First, DC analysis, nothing strange:
Then analyzing more: parameters DC ...
- 11.9k
0
votes
2
answers
229
views
Feedback amplifiers and their corresponding system block diagrams
I'm a newbie in analogue circuits. I find it so confusing analyzing feedback amplifiers.
The typical feedback systems introduced in textbooks is shown below. The input signal \$X\$ is connected to a ...
- 309
0
votes
2
answers
316
views
How do you calculate the total resistance here?
I have three resistors in an inverting operational amplifier and I should compute the Vout with the total resistance of those 3. Should the Rf/k be considered connected in parallel with those 2 Rf? My ...
- 11
0
votes
1
answer
253
views
Inverting amplifier not acting as expected with non-ideal op amp
I'm fairly new to using op amps, so this may be a simple issue. I am building an inverting amplifier for monitoring a negative voltage on an analog rail. Since the ADC I'm using requires a positive ...
- 105