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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134 views

Inverting opamp amplifier

The gain of an ideal opamp is considered infinite and Vout=K(V+ - V-). where V+ is the non-inverting input and V- is the inverting input. The output voltage in the case of an inverting opamp amplifier ...
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Don't understand this zero pole plot example

I'm reading a book (see figure 5-12) about (among other things) pole zero plots and there is an example I don't understand. For the schematics and formula below: it adds the following zero pole plots:...
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65 views

How to get the DC gain of an active high pass filter?

Edit: I think maybe I am confusing terms (it has been a few years since my last electronics class). I am trying to get the expression for the gain of this active filter amplifier circuit in terms of ...
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59 views

Miller effect adjustment

I'm confused about the following discussion of the Miller effect/approximation from Razavi (image below). I don't understand the premise of the question. If one reasons that the gain seen by the ...
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1answer
43 views

How is the Tx/Rx Gain calculated in USRP?

I'm using Software Defined Radio NI USRP 2922 (Universal Software Radio Peripheral). I know that USRPs are uncalibrated devices. In many exampls you can set the so called Tx or Rx gain (as in the ...
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1answer
41 views

Why does adding a gain to a Sallen-key second order HPF change the amplitude response?

As the title suggests, I have done all the necessary calculations to implement a gain into my second order stage of my 6th order high pass filter but for some odd reason, it would change the amplitude ...
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How do I find the -3dB point on a given graph

I just performed an AC Simulation on QUCS and was asked to find values of gain and phase at low freq. and high freq and at the -3dB frequency point with the roll-off slope. The circuit is an RC ...
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683 views

In an amplifier, does the gain knob boost or attenuate the input signal?

I'm thinking specifically about guitar amplifiers, but I'm guessing this applies to all audio amplifiers. I understand the practical function of a gain knob, but what's not clear to me is whether the ...
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31 views

hFE value (a.k.a β or gain factor) for transistor, at different voltage

I've been looking into the BC337 NPN transistor, and I saw in the hFE graph on page 3 of the datasheet, that the graph was at 1V from the collector to emitter. Is there any way to find out the hFE ...
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55 views

What causes the Inverting input of this op amp to conduct current?

When I analyse this circuit to understand it's working, I got stuck at one point. Have a look on this circuit. When the feedback resistor value is 2.2k as shown in fig, I got the expected output with ...
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41 views

Amplifier circuit for Bently Nevada velomitor 330525

I'm in need of measuring vibrations and I have access to these Bently Nevada velomitors. I'm not sure how to design a ampliefier circuit for the signal. The datasheet is says that it is a piezo ...
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Recreate “Voltage gain vs Frequency” graph of Op-Amp in LT Spice

I am trying to recreate the "Voltage gain vs Frequency" graph of the LT1037 Op-Amp in LT Spice. According to the datasheet page 6 the graph looks like this: - Trying to recreate this in LT ...
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Open Loop Gain in Buck Converter

I'm trying to understand this application note from On-Semiconductor regarding the loop control design of buck converter Designing Stable Control Loops for High Current Voltage Mode Synchronous Buck ...
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37 views

How does the thickness of a dipole antenna affect the gain and the field strength?

I was asked this question on an exam and I couldn't answer it. I've searched the web and looked in my books but I can't find any information about gain and field strength vs. dipole thickness. I know ...
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72 views

transistor amplifier

My teacher asked me to design an amplifier circuit using BJT transistors with following properties: (Is=10fA , beta=100, Vce sat =0.2) I can use as many transistors as i want but i try to minimize the ...
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how to find Vout/Vin in this circuit? BJT frequency response

I have been struggling for 1 hour trying to relate Vout to Vin. However, I truly cannot. I tried KVL, node analysis etc everything that I could. Can you help me pls? The topic is frequency response of ...
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386 views

Why is there a resistor in the feedback section of this buffer circuit?

When I searched for op amp buffer circuits on internet, I found this picture. I just want to use it as a buffer circuit. So, obviously the gain of this configuration will be 1. I would like to put 0 Ω ...
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1answer
60 views

Identifying transistors

I have found an old driver board (probably the mid 80's) for stepper motors (rated at 1.25V 3.8A) and I want to rebuild the H-Bridge using the parts on the board and a micro-controller as an input. I ...
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184 views

Is there an easier alternative for finding the gain of this operational amplifier?

My question is: Is there an easier method than what I've tried, that I can use in order to find the parametric gain in the following circuit? If so, what is it? The circuit: Where the parametric gain ...
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39 views

Small signal gain

I'm struggling to find the small signal gain of the circuit shown below. I am trying to find the gain from Vout to Va. Note that Vout corresponds to the output of an amplifier. Any help is much ...
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93 views

Reducing noise in microphone amplifier circuit at higher gains

I am using the below circuit to amplify the signal from an electret condenser microphone for analysis by a microcontroller to detect short bursts of sound. The circuit runs off a ~4.5V supply from 3 ...
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1answer
43 views

How gain is changed in this Op-AMP integrator?

Hi, I am simulating this circuit for personal development. The gain of the integrator can be calculated using the following formula: Gain = -Rf/R1 (1/(1+(2 x pi x f x C1 x Rf))) But, how to calculate ...
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Formula to calculate the isotropic range of a signal

I am wondering, is there a formula to calculate the range of a signal with a given frequency and output power? For example, how do i find the range of a 580khz AM signal on entirely flat terrain with ...
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1answer
72 views

Audio equalizer circuit using multiple feedback bandpass filter for each frequency band

I have a project to design an audio equalizer circuit with the following specifications. Bass band, center frequency = 180 hz, quality factor =0.7, range of adjustable gain 0.4-8 Midrange band, ...
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Is it possible to add gain to a dipole antenna without changing its radiation pattern?

In every reference book I've seen, an electric dipole antenna has basically a donut pattern, and as things are added to increase the gain (directors, reflectors etc) the pattern changes. I've always ...
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1answer
162 views

Complex conjugate poles for OTA unity gain

So I am designing an OTA, exactly like Miller OTA, but I tried to see the behaviour without Miller compensation. The circuit diagram is shown below As seen there is no compensation network, neither ...
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Help needed for cis orcad + pspice

I have been trying to simulate a circuit on pspice. Simulation worked really well and pspice has given me the expected diagrams of gain and phase. I am having difficulty thought on how to use the ...
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Misunderstanding of calculating gain of amplifier

I’ve been reading in my textbook that the gain is Gain= Vout/Vin= 1+ Rf/Rin However, what if there isn’t a resistor like this amplifier? Would it be 1V/V or 2V/V? Or am I totally misunderstanding this?...
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58 views

How do I compute the gain on this differential amplifier (in an open loop)?

Hello! I've got this project due for a college course, and the teacher has reviewed my work and said that it is within specification, but he asked me to compute the gain the good old fashioned way ...
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132 views

Designing an amplifier to drive a speaker

I am a beginner in designing this circuit, can someone give me a tip on how can I achieve the following specs? Variable gain and a maximum gain of 12 dB Input impedance greater than 30 kΩ Load ...
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76 views

I'm designing a preamp to connect 10K load. I need 2vptp at output from an 200mVptp input. but I want these bias conditions

Need gain 0f 10. without changing dc bias conditions. what will be best solution?
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44 views

How do I calculate the gain of opamps in this circuit?

I can calculate the gain of AD8656 but can not calculate the overall output gain of this circuit. What is the method of doing the calculation?
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65 views

Design of an amplifier with emitter degeneration

I'm trying to solve a question that says to find \$gm\$ and \$R_c\$, considering a gain of 50 using a BC547b transistor. But I can't find a way to calculate these parameters with the information I ...
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42 views

Ce stage amplifier

I wanna design a ce stage amplifier with this specification : Gain 20 Rc=10k Max swing The simiulation of the circuit is not the same with may calculations, How can i solve this? what i get from ...
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1answer
81 views

Gain with load or gain without load?

There is a problem I have been dealing with for hours. In my Electronic 1 lecture, small signal analysis was like this: The small signal equivalent of this circuit in my lecture notes was this: When ...
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3answers
125 views

Why is power gain a meaningful quantity at all?

I'm quite confused at a very basic concept: power gain. An amplifier can be said to have a power gain of x decibels. The gain of an amp in decibels is never voltage or current, it is always power. But ...
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3answers
248 views

Confused about the definition of voltage gain

I found these formulas for different gains of an amplifier/filter on logarithmic scale. The topmost is power gain, simply 10 times the logarithm of the ratio of output to input power. The next one is ...
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1answer
62 views

How to get (with a fixed range and offset) linearly proportional signal from a variable range on the input?

Ask: How to get (with a fixed range and offset) linearly proportional signal from a variable range on the input? Conditions: There's a signal (to simplify, consider a sinusoid) with variable amplitude ...
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4answers
243 views

Switching gains on a precision operational amplifier using a microcontroller

I need to be able to switch between gain values on a precision opamp in the microvolt region using a MCU. What is the best method to do this? Noise is critical.
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1answer
39 views

Did I interpret these multisim results correctly?

From the circuit above, this is what I have to do: " Connect the circuit with R3 equal to 470 kΩ. Set the input frequency to 100 Hz. Adjust the signal level to get an output of 5 Vp-p. Record ...
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1answer
72 views

Opamp: Compensate to achieve constant gain

I have been trying to achieve a constant gain across an LM318 opamp in a differential amplifier configuration ranging from 500Hz to about 500kHz. The opamp has a bandwidth of 15Mhz. Since the gain is ...
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64 views

Differentiator step response

I have one ideal and one practical differentitiator circuit in Multisim to which I am applying a positive, say 10 V step response. The output I get has a much lower settling time at final value of 0 ...
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2answers
73 views

Converting differential-current output to single-ended voltage; adjustable gain

I want to convert differential-current output of DAC2902 to single-ended voltage. Can I do it with following differential op-amp configuration at the output of the DAC? The voltage gain is fixed = 1 ...
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2answers
81 views

Differentiator cut-off frequency

A practical differentiator has two cut-off frequency but can no longer perform differentiaiton after first cut-off. After first cut-off there is a 20db per decade gain reduction but why does this ...
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1answer
66 views

How to amplify a differential signal

Let us say I have a DAC that gives out differential signal and I want to amplify it. How can I do that?
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84 views

Open-loop frequency response for an op-amp

I want to know what is the ideal circuit to measure open-loop frequency response and why?I have seen the typical open-loop frequency response curve for an op-amp a lot of times. But when I try to plot ...
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Creating atime based heat exchanger simulation in OpenAi gym and MATLAB for the purposes of temperature control regulated flow rate in

Apparatus: Crossflow Tube and fin HX. (liquid-to-air Intercooler), Hot Side: Tube side, gas flowing internally Cold Side: fin side, water flowing in crossflow Goal: Generate an environment in "...
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3answers
110 views

How to make sense of EIRP?

I've been introduced to the concept of equivalent isotropically radiated power (EIRP) and so far I've used it to calculate RF power density at distance of 100m radiated by a directional antenna with a ...
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35 views

How to calculate a parallel power gain?

I had once an oral exam where the teacher was asking me how to calculate the power gain in a parallel way. I am doing datacommunication/telecommunication. In the following pictures I am sharing ...
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1answer
45 views

Transform one voltage range to another

I have a 0-12V voltage range (Vin) that I need to transform to a 100mV-900mV voltage range (Vout). The 0-12V input is fixed from another system, and my analog circuitry needs the 100mV-900mV for ...

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