# Tag Info

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### How to share a single gain resistor among multiple op-amps in a circuit

My hacked solution: Source: https://www.youtube.com/watch?app=desktop&v=NoNgQpbj77Y&ab_channel=EngineeringProf Use one of these circuits, you should be able to parallel the current mirror. by ...
• 82.6k

### How to share a single gain resistor among multiple op-amps in a circuit

The instrumentation amp single-resistor gain set works because both input amps are processing aspects of the same signal. You want to have currents from four different signals go through one resistor ...
• 20.2k

### Negative Voltage at Transistor bases in my Differential Amplifier

You're pulling the emitters to -12V, and the DC path from the base(s) to ground is 100K. In that configuration, the emitter will be pulled down until the collector supplies enough current to balance ...
1 vote

### Noises are measured over a bandwidth. Is 50Hz and 900Hz noise the same at 1kHz bandwidth?

To resolve a signal, you must sample at least twice the frequency of the signal. However, if you only sample at twice the input frequency then you would need to use the Fourier transform of the ...
• 12.2k

### How to measure fully differential amplifier input impedance in PSpice?

Fully differential amplifiers have a "virtual short" between their inputs due to how they operate (equivalent to the concept of "virtual ground" on inverting single ended ...
• 3,365

### How to measure fully differential amplifier input impedance in PSpice?

I'm not an expert in this fully diff. Amps. However, I see an inverting configuration with a 2kohm series resistance at the input, and there's a virtual ground at the input of this amplifier, which ...
• 4,030

### How does the current and voltage stabilize in a differential amplifier?

When you say you're familiar with a single transistor arrangement, do you mean with a current source, or with a resistor at the FET's source terminal? The two are wildly different in behaviour: ...
• 35.2k
1 vote

### How does the current and voltage stabilize in a differential amplifier?

Basic idea It can be revealed at а functional level by equivalent electrical circuits. In this brilliant circuit solution initially called with the figurative name "long-tailed pair", a ...
• 16.7k
1 vote

### How does the current and voltage stabilize in a differential amplifier?

But I'm used to thinking in terms of one transistor ... If you are happy with analysing a single transistor, then I would suggest breaking this circuit apart into its Common Mode, and Differential ...
• 166k

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