Questions tagged [differential-amplifier]

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Fully Differential Amplifier With Common Mode Feedback Network

I need to design the following circuit in a way that can provide a gain of 1000 and also has a power dissipation of 1.8 mW which, according to my calculations, results in a branch current of 250 μA. I'...
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1answer
74 views

Is this a difference amplifier or a non-inverting amplifier?

I have a non-inverting amplifier as shown below: I was advised to increase the feedback resistor to decrease the current drawn from the output to 3.3kOhms. I was also advised to add a resistor, lets ...
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0answers
39 views

Differential gain of single ended differential amplifier

Roughly starting from 45:00 of this video, Prof. Hajimiri derives the differential gain using a large signal diagram, but I don't really understand how he arrives at the final result. He defines the ...
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1answer
65 views

How does this offset and gain amplifier work

The circuit below is meant to scale and offset Vin to Vout: In the actual application Vin is a battery voltage (4 to 5.5V ish) and Vref is a fixed regulated voltage derived from it (3.3V). The op-...
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1answer
61 views

voltage divider inside differential op amp configuration

I'm working on a DIY analog synth based on the CEM3340 chip. When feeding it 12V at VCC it will output waves at different amplitudes that I'll want to scale to 5V to -5V: Square: 0-10.7V Sawtooth: 0-...
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2answers
324 views

Why does differential op-amp require mid-point biasing at its input to prevent clipping?

There's an AC signal, 1 V amplitude, which is the input to an op-amp, in differential mode: However, the output gets clipped and the amplitude isn't unity for some reason, even though gain is set to ...
1
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1answer
44 views

Voltage gain of a differential amplifier with tail resistor

Suppose the following differential amplifier: simulate this circuit – Schematic created using CircuitLab To calculate the differential gain, I take advantage of node P being an AC ground and I ...
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1answer
56 views

Problem amplifying differential signal from DAC

I encountered a problem while designing my own waveform generator. In my design, I am using a DAC (DAC5662) to generate different types of signals, and then I amplify the signal using an operational ...
1
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1answer
84 views

Why is the output impedance so high in my differential op-amp?

I tried to make a differential op-amp, but I get around 65k ohm of output impedance. I read online that op-amps should have ~50ohm to about maximum ~500ohm output impedance, but however I change ...
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1answer
51 views

Gain Value For Modified Differential Amplifier Circuit

I am trying to analyze the following differential amplifier circuit and am wondering how to calculate overall gain (it will be fed with two copies of the same audio waveform 180 degrees out of phase ...
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1answer
111 views

Controlling gain and modulation depth of long-tail pair as AM modulator?

I'm investigating use of a differential pair as an AM modulator. The schematic below illustrates the general plan, but the values aren't really specific (not least because this isn't working yet!) ...