Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [unity-gain]

46 questions
11
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2 answers

Expected and actual unity gain bandwidth LM324N

I have an LM324N configured as a unity gain voltage follower. The split rail power supply +/- 4.5V is provided using AA batteries. I am aware that better opamps exist, but this is for study purposes only. simulate this circuit – Schematic created…
Pzy
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3
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3 answers

Instability of op-amp in unity gain configuration

I am using a TSZ121 op-amp with a unity-gain configuration driving 100 pF via 20 Ω at the output. Power supply is 5 V. My input is a slow moving signal between 0.4 and 1 V from a temperature sensor. I noticed a continuous 20 kHz oscillation at the…
jsmith0910
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3
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4 answers

Unity-gain bandwidth circuit with uA741 op-amp

Q: Using Op-Amp uA741, design an amplifier that offers a passband gain of 40dB with a minimum bandwidth of 20kHz. The current through any resistor in the amplifier should not exceed 10 mA. Include the details of the design process. I do not…
IrrationalPi
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3
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2 answers

Significant error with unity-gain feedback op-amp

I used this OP97 op-amp to make a simple unity-gain feedback circuit. I would expect the output in this case to follow the input with very little error, however the output is actually measured at \$ 2.7 \text{ V}\$ rather than \$ \approx 3.1 \text{…
HallEffect
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3
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2 answers

LM358 opamp unity gain cap

I'm using an LM358 op-amp for unity gain (feedback to V-). However, I'm getting some unexpected results. When Vin is from 0v - 3.75v, op-amp output is as expected 0 - 3.75v. However, when Vin is greater than 3.75v, op-amp output is capped at…
dlcircuits
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3
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3 answers

500V unity gain buffer

I am currently in the process of designing a high-voltage bias supply for use with an ionization chamber. The voltage source itself is taken care of however I need a unity buffer to drive the guard of the chamber, also raising it to 500V. A simple…
smee
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3
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1 answer

Op-Amp with Voltage Controlled Gain and Unity DC Gain

I have a car seat motor that I am driving via PWM and am aiming to measure its position by counting the minor variations in voltage across a current sensing resistor attached to the low side of a FET as the motor rotates. At higher duties the Vpp is…
user122407
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2
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1 answer

Unity gain differential amplifier null adjustment circuit not working

I have a differential op amp that I believe I have set up as a unity gain differential amplifier. When I measure the potential difference across pin 6 and ground and adjust the 5K trimmer potentiometer, it doesn't change the output at all on pin 6.…
axawire
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2
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2 answers

Voltage divider high resistace

I need to build voltage divider to measure the battery voltage (7.3V) using max 3.3V ADC. As the device most of the time spends in the sleep mode (<1uA), the current drawn from the battery should be very low (best <70nA) so the resistance of the…
0___________
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How to design a 2nd Order High Pass Butterworth filter with a cutoff frequency of 0.5 Hz?

c1=c2=10µf, R1? R2? using the unity-gain Sallen-key topology what should I do?
Cyrine Dridi
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2
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1 answer

Unity Gain Phase Splitter- Why outputs have different voltages

I’m trying to calculate the values of the biasing resistors for this phase splitter circuit. (I know the actual values of the resistors, but I just wanted to manually work it out). When I made the circuit on a Multisim, I realised that Vc=11.25V and…
Neamus
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Simple op-amp frequency response

In my textbook, there are two interrelated equations. 1. wb = wt / (1 + R2/R1) 2. wb = wt / Ao where wb = break/cutoff frequency wt = unity gain frequency Ao = DC gain R1/R2 = standard resistors These equations were derived from a simple and…
ennell
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2
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1 answer

High freq OP-AMP voltage follower is ringing and is unstable

I try to design analog buffer for the 5MSPS STM32 ADC. I try to use TSH114IDT or CLC4007 opamps ( I need 8 in total). I have done so far: Tried the design below with or without some of the elements - removing load , output capacitor, input…
0___________
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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 non inverting amplifier and it has a gain of 96. it…
Moeen Ahmed
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2
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Adding offset voltage to sensor signal

I have a pressure transducer outputting 0-5V which is sampled by an ADC with a 0.5V minimum input voltage. I need to offset the sensor output voltage by a fixed voltage of 0.5V. I've looked at an op amp circuit for doing this. But I struggle with…
Oystein
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