# Questions tagged [gain]

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 < 1)

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### Opamp resistor arrangement to get out of its noise

In the balanced line technoloy text, the author mentioned that we can't have a large resistor for R1 in this circuit: The author said: For a series-feedback stage, the input impedance can be made as ...
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### Effect of antenna direction on antenna gain

I'm studying antenna theory right now, and I have a question about the effect of antenna direction on antenna gain. My assumption of the antenna direction is like below: Since the Rx antenna cannot ...
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455 views

### Common emitter transistor amplifier working in simulation but not in reality

I'm currently learning about transistor amplifiers. I've designed this CE amplifier circuit that should yield an ac voltage gain close to 100. I assume my calculations where right, as it seems to ...
781 views

### How to find the gain of an inverting amplifier in terms of feedback?

I have been struggling to answer this question from The Art of Electronics where it asks me to find the closed loop gain of a non-inverting amplifer in terms of feedback and says that the derivation ...
1 vote
59 views

### Discrepancy in theoretical vs measured gainbandwidth in LTSPICE ideal OTA

I am using a very simple model to show the unity gainbandwidth of a closed loop sample and hold with a closed loop gain of 2. One would expect an ideal OTA to have a GBW independent of rout as GBW is ...
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### Calculating SPL in octaves from .wav file recorded with microphone in Python

I made a recording of my environment with a microphone with the following specs: The recording has a sample rate of 44.1 kHz and a bit depth of 16. I use: y, sr = librosa.load(latest_file, sr = 44100)...
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### Voltage regulator equation

I'm designing a circuit using this buck regulator (AOZ2253TQI-20) from Alpha & Omega. Data sheet here, http://www.aosmd.com/res/data_sheets/AOZ2253TQI-20.pdf The data sheet doesn't specifically ...
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1 vote
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### NPN BJT emitter current only from base

I'm working with a BC637 transistor. I want to deliver a 48 V, 2.5 mA signal to my load (diagram below.) I have the load connected through the emitter pin (19.2k Ω resistor.) I was under the ...
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78 views

### Quantifying signal loss - should we use power gain or voltage gain?

We're researching communication with electrical signals through the human body (also called body coupled communication). We want to quantify the signal loss between a transmitter and receiver attached ...
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1 vote
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### A/B power amplifier: difficulty getting a full output voltage swing

I have been designing an A/B voltage amplifier using the TIP31C/32C power transistors (schematic shown below.) I have a significant loss in voltage gain which I haven't able to negate. Is this ...
77 views

### Basic Variable Loundess Audio Amplifier

I am a beginner, looking to make an extremely basic variable loudness (gain) audio amplifier. I have a general idea of how a class A amplifier works, but I am not sure how to make one variable. This ...
799 views

### Ideal behavior of op-amps [duplicate]

I have been studying about op amps and there is something I can't get my head around. The thing is, when assuming an ideal op-amp, one of the restrictions we obtain is that the voltage in both the ...
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### Expected voltage on external gain resistor pre-amp

I want to build an amplifier with digitally controlled gain, using the THAT1510 pre-amp IC. The IC provides two pins to set the gain, using resistors. I want to switch between resistors with analog ...
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135 views

### Gain of transimpedance op amp

I am trying to calculate the gain-bandwidth product of a project where I am reading photodiode output current measurements. I aim to find an op-amp to buy to use as a transimpedance amplifier. The ...
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448 views

### Input bias current and offset current calculation for an LM741 op-amp

This is my circuit diagram: The bias current of the LM741 op-amp is 80nA. The offset voltage is 1mV. The LM741 has relatively large current offsets, voltage offsets and input bias. I calculated the ...
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366 views

### What is the small signal gain for this circuit?

The question looked easy at the first sight. I found the quiescent current through the BJTs. I can say that |Vbe| = 0.7 V for both BJTs. Therefore, current through 1 kΩ below Q1 = 2 mA. Similarly, ...
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1 vote
58 views

### Calculating N-type enhanced MOSFET gain with two different equations brings me a different result?

Hi, take a look at this problem from my notebook. Leave alone the fact that the resistor should actually be 1,111.111, it is not related. If they claim that VGS=2 and Vs is connected to ground it ...
85 views

### 1-dB compression point is in the range of -20 to -25 dBm

I am reading the Razavi's textbook RF Microelectronics 2nd edition p. 18. It says 1-dB compression point is typically in the range of -20 to -25 dBm (63.2 to 35.6 ...
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