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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49 views

Voltage gain from the Amplifier input to the load

I don't understand where the solution for part C coming from. What I thought is also Vo/Vi. I found Vo as 303 mV and Vi as Vs*(10/10+100). However in solution it seems my thought is wrong. How should ...
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604 views

Do we always take the corner frequency of a filter at exactly -3dB?

I'm doing some work on filters, but all the references I can find use a 'perfect' gain characteristic, with the trace starting at 0dB. Is the measurement for corner/cutoff frequency always taken at ...
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455 views

How are the -3dB point and the pole of an op-amp related?

I have been looking at AC frequency responses for op-amps and I was wondering how an op-amp's pole and the frequency at the -3dB point are the same? They both mark the location where the gain starts ...
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72 views

Two stage amplifier, low gain at high frequencies

When I simulate one stage amplifier it is capable of amplifying to a much higher frequency than a two stage amplifier. I added a 100 ohm resistor to reduce the gain of the two stage amplifier so both ...
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59 views

How to make sense of the math behind differential opamp

My first question here! So, I'm designing a simple fully differential amplifier. The final target will be to implement a low pass filter (but I'm not there yet). Although all seems perfectly fine in ...
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36 views

How can I find the slope at Vout/Vin at Vin = 0, from the datasheet about Op-amp?

I'm trying OpenModelica and I'm going to simulate an Op-amp. (No it's not Windows 95, it's IceWM + Ubuntu 20.04) But I wonder where I can find the slope Vout/Vin when Vin = 0 in the datahseet? I have ...
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27 views

Power gain values at the microwave amplifier

I have generated graphs in AWR software for signal gains, G_A, G_max, G_P and G_T, respectively. The amplifier I am using is "HMC141". Unfortunately, the values that came out look like this: ...
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147 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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121 views

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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94 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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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
51 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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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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94 views

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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692 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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56 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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43 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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71 views

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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39 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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77 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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401 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
61 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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190 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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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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1answer
107 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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47 views

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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90 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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61 views

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
169 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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2answers
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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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139 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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1answer
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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45 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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67 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
125 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
132 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
294 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
63 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
245 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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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
74 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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72 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
92 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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