Questions tagged [summer]

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4answers
106 views

Diodes circuit analysis problem and voltage calculation

I'm learning about diodes. In one of problems which book has solved, it says Vo=((Vi-2)/2) +2 when both diodes are off. I can't understand why we have "+2" here. My calculation of Vo is ...
5
votes
6answers
475 views

In a negative feedback loop, why does increase in v_out lead to increase in v-?

I hope this is the right place to ask this question. (Please let me know if there's a better place to ask this.) Basically, I'm quite confused about how we check if we have a negative feedback loop. ...
0
votes
2answers
138 views

Which is the input resistance of the second amplifier?

If a apply a positive Vs, then D2 is blocked and D1 is working, right? How do I calculate Vo then? I know the formula is: - (input resistance / negative feedback resistor) * Vs, but I don't know which ...
4
votes
5answers
727 views

Universal (magic) Op-Amp Fundamentals

In a recent lecture in my AC Circuits course, the professor put this slide up and hastily explained the Universal Op-Amp. Since I already struggle with circuits, let alone operational amplifiers, I ...
0
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2answers
131 views

Very basic circuit question

My problem is in the VA, VB parts is the previous circuit equivalent to this (OPTION A): Or to this (OPTION B):
2
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1answer
96 views

Problem with summer in VHDL

I'm trying to do a summer in VHDL, but when I try simulate, appear an error. The code: ...
0
votes
0answers
38 views

Help in analysing circuit to show which resistor controls the differential gain

I understand the circuit to be a summing circuit but I am struggling to analyse past this point: Vout = R5 (((-R2/R1 * V2)/R4) * (V1 / R3)). can anyone analyse this further to prove that R5 is the ...
1
vote
5answers
109 views

Summarising from a group of sensors

I have a group of sensors the nominally output 2.5V but if they come in contact with a magnet they'll increase slightly or decrease slightly based on the polarity (north/south pole). These sensors ...
0
votes
1answer
757 views

Designing a Silicon Photomultiplier Read-Out circuit

I'm designing a Silicon Photomultiplier circuit with an amplifier. The base circuit can be shown below. simulate this circuit – Schematic created using CircuitLab This was from SensL's ...
0
votes
1answer
176 views

Mixing two signals without affecting output bias point?

I want to mix together two signals. The signals have a DC bias but i'm only interested in the AC portion. Capacitors C1 and C2 are used to strip out the DC from the input. Potentiometers R1 and R2 can ...