Questions tagged [operational]

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Definition of operational transconductance amplifier (OTA)

I'm trying to understand the definition of operational transconductance amplifier (OTA). The book on which I'm studying defines it as a class of operational amplifiers which "achieves a high voltage ...
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2answers
84 views

Measuring maximum output current of Operational Amplifier

I just designed a two stage miller compensated operational amplifier, I am not sure how to measure it's maximum output current, Can you give me a precise definition of this current?
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2answers
41 views

Calculate linear phase when given in decibel

The datasheet of the LT6230 shows the opamps phase lag in decibels (page 14). The datasheet does not give a formula to recalculate the angle in degrees, so can I just assume the following being the ...
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1answer
32 views

Photoresistor Night Switch

I have a problem regarding the schematic from the link below. I made the schematic from this link, at figure 5:http://www.nutsvolts.com/magazine/article/light-sensitive-circuits The problem is that ...
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2answers
245 views

Inverting Op-Amp Circuit Problem

I am trying solve the question shown in the picture below (I am assuming the switch is down in the picture, I can't tell) The equation that I am using is Vout/Vin = - Rf/Rin because there is ...
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1answer
62 views

Ouput and input impedance of two circuits

I would like to know if that is correct Ideal Operational amplifier Zi=inf Zo=Zc||R 741 Operational amplifier Zi=2Mohm+R+Zc Zo=Zc||(R+75ohm) (at DC) Ideal Operational amplifier Zi=R+Zc Zo=0 ...
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3answers
318 views

Output impedance in a circuit with Operational Amplifier

How I can obtain output impedance of this circuit? I would like to know in the ideal case and the LM741 case. Thanks.
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1answer
485 views

3.5mm Stereo to dual 6.3mm mono. Would this work?

I need to build an adapter which does not seem to be readily available so I can use an audio mixer with my iMac and iPad. The adapter will convert one 3.5mm male stereo jack to two 6.3mm male mono ...
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3answers
59 views

Finding the output voltage/Operational Amplifier

I've got this circuit and I want to find the output voltage \$U_A\$. We are given the values of the resitances, the input \$U_E\$ and the "supplying" Voltage \$U_V\$ (which isn't drawn here): \$...
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2answers
524 views

Calculating gain of simple op-amp using KCL

So I'm having a bit of trouble calculating the expression for the gain or ,\$ \frac{V_{out}}{V_{in}}\$, for the given Op-Amp circuit down below. I've gotten to the point where I've written out the KCL ...
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3answers
2k views

Output Drift of an operational Integrator

R = 1k and C = 0.1 uF In practice, the output of and operational integrator will (drift) until it saturates at a value close to one of the supply voltages, even when the input voltage (Vin = 0). Why ...