# Tagged Questions

Simply the ratio of output signal to input signal, this dimensionless quantity is a measure of the amplification of a signal which may be represented by voltage, current of may even have a digital representation. A very general concept sometimes used to describe attenuation (when gain

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### Amplifier Feedback Gain

I'm stuck on the part b of this tutorial question. I thought I understood the theory, but I can't get the right answer. For part a I got: A(f) = 10^3 * jw / (3jw + 200) From my understanding, the ...
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### How to set gain for SIM900 for clear audio output. Gain vs Volume.?

I have a SIM900 module. I need to listen to the audio of the call. The audio output of the SIM900 is very weak so I have used this LM386 audio amplifier module. I am giving 5v to it and have connected ...
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### Gain of a circuit having coupling and load capacitor

I need to find the gain of the circuit below. small sgnal analysis I guess while finding the gain, we should make load capacitor open circuit and coupling capacitor short circuit. After that, we ...
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### Extrapolating Transistor DC Current Gain Graphs?

I'm working on a design which will use a BJT to switch 2 PMOS gates low to power 2 separate loads. I am going to drive the transistor from a NOR gate. From my transistors datasheet, I thought I could ...
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### Calculation of Open loop differential gain and open loop output Impedance

I want to calculate the open loop output impedance and open loop differential gain of a discrete differential amplifier (Figure attached). Is this feasible? Here is the approach. INPUT STAGE: ...
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### Passive RC network with voltage gain greater than unity?

I'm a EE student who recently purchased the classic Art of Electronics (new 3e). I was reading the first few chapters when I was referred to appendix J in the book depicting a SPICE tutorial but also ...
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### What is a typical value for the gain of a smartphone's Bluetooth (or Wi-Fi) antenna? [closed]

I can't find specific values for transmitter and receiver gain anywhere. Very often the Bluetooth module is together with the Wi-Fi module, so a Wi-Fi antenna gain value will help me as well. I need ...
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### Calculating the Gain in an Amplifier circuit

Having some issues calculating the gain in circuit below, it is apparently 1802, but I can't seem to arrive at this answer. If anyone could help explain how to get this answer I'd be very appreciative!...
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### SOS! Finding Open loop gain - breaking feedback loop

I’ve just become quite confused regarding on how to break the loop; please can you clarify if there may have been a mistake in one of the solutions to part d) of this question where it it is required ...
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### A confusion on the current gain of an NPN transistor

In above screenshot V2 is increasing ramp voltage from 0 to 12V, which accordingly increases Ib. Transistor is an NPN type. Ic(q1) is the collector current. Vce = V1 is a constant 1V. So it means ...
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### No plot for DC current gain in datasheet

Here is the data-sheet: https://www.fairchildsemi.com/datasheets/2N/2N4401.pdf I want to use a 2N4401 NPN transistor in active region for amplification, and I want to know its beta(DC current gain) ...
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### Did I mess up my lab experiment ? (active low pass filter)

This is the table of the readings and I have worked out the gain which is $$\frac{Vout}{Vin}$$ and I got all 5 at the beginning ... but I also remember that the values of the resistors in the feedback ...
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### Wien bridge sinusoidal oscillator

simulate this circuit – Schematic created using CircuitLab I would check that in the Wien bridge sinusoidal oscillator the gain A_V=1+(R5+R4)/R3) is actually A_V=3 as the Barkhausen stability ...
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### finding the gain of a two stage voltage amplifier

i currently do not know how to approach this question, in terms of simplifying the circuit and which formulas to use in order to find the gain
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### average of dBs or dB of average?

In several papers, books etc. I have encountered to expression of "average gain of the path is ... dB", now I wonder this is the average of dBs or dB of averages? The sources have not mentioned ...
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### unfamiliar gain equation of differential amplifier

I am examining op amps and I found this pdf very helpful: http://www.aicdesign.org/SCNOTES/2010notes/Lect2UP230_(100327).pdf In this tutorial, the op amp circuit topology is given as this: and ...
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### Finding the voltage gain at low frequencies

can anyone explain how the second expression for the gain is obtained? they multiplied or divided the first equation and came up with second one.
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### designing a variable gain amplifier

I want to build a variable gain amplifier. My first thought was to build two feedback resistors and switch one or the other off with a MOSFET. However, the MOSFETs have shunt diodes which are going ...
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### What is the relation between the gain and range of a data-acquisition amplifier?

A data-acquisition amplifier has different ranges. The board amplifiers a voltage sample and ADC converts it to a digital code. There is probably a reference voltage inside the board so it compares ...