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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1answer
57 views

What is the current gain of this op-amp circuit?

I just happened to see this circuit in some lecture slides and I thought I could solve it. Unfortunately, I've been trying to check my result with an ideal simulation in LTspice and all my attempts ...
6
votes
2answers
247 views

Common Emitter not amplifying

I am trying to make a 27 MHz carrier wave transmitter from a crystal oscillator and a secondary amplifier. Thi is the complete circuit: simulate this circuit – Schematic created using ...
3
votes
1answer
71 views

What exactly is (Horn) Antenna Gain

I was doing an experiment for finding the radiation pattern of Pyramidal Horn Antennas at RF frequencies(as part of my course curriculum). There I came across the Friis Transmission Equation What ...
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2answers
74 views

Op amps with 1000 gain and 10 volt out

I've been looking for a part that I can boost a 10 mV signal to a 10 volt signal using a single op amp, so far most of the op amps I've found only meet the gain requirements, but cannot output 10 ...
0
votes
3answers
148 views

Amplifier design: feedback with unclear poles

When designing a closed loop amplifier for audio the poles of the open-loop transfer function are usually only vaguely known. \$\frac{1}{(s-p_1)(s-p_2)...}\$ These poles can be modeled as \$RC\$ ...
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1answer
62 views

Modeling diode connected transistor in differential amplifier

I have question about the analysis of common-mode gain of BTJ differential amplifier with active load on the Sedra Smith book. In this book, the differential-mode gain \$Ad\$ is derived based on the ...
2
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1answer
75 views

Op Amp magnitude of gain proof

I've been working through a proof but I'm stuck on one of the last steps. Consider an inverting op amp with a feedback resistor \$R_f\$ in series with a capacitor and resistor \$R_1\$ simulate ...
2
votes
1answer
46 views

When the Gain Margin is negative, for what range of frequencies is will the output resonate out of control?

If your system/transfer function has greater than zero gain for the frequency associated with -180 degrees phase, the system is said to be unstable. What does this mean for other input frequencies? ...
2
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2answers
83 views

OpAmp configuration with gain less than 1

The output voltage from AD5611 DAC is rail-to-rail, and minimum Vcc is 2.7V - therefore, the signal range is 0-2.7V. I need to attenuate this signal to let's say 0-2V range. The DAC output is very ...
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1answer
81 views

High-gain feedback amplifier design using ADA4004

I am trying to design a feedback amplifier with ADA4004. My desired gain is about 42dB@2kHz. Is it possible to design a stable amplifier with such gain using ADA4004? The ADA4004`s GBP is 12MHz. The ...
2
votes
3answers
101 views

BJT amplifier gain rolloff

I'm playing around with BJT amplifiers and have some questions regarding the gain rolloff you see at higher frequencies, I'm using the 2N2222 for my tests and my simulations and measured results match ...
0
votes
1answer
52 views

Mosfet gate resistor vs Gain

I have a small question. I was doing a lab with MOSFET 2N7000. The circuit is something like the one below: There was a question asking if the gain should change if the resistor R1 was changed to ...
0
votes
4answers
164 views

Controlling an Op-amp gain using an MCU && || DAC?

I'm building a circuit that will generate various wave forms. The output from the circuit is fed to a summing amplified where positive or negative dc offset is being added. This signal should be ...
1
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2answers
141 views

I'm confused by the formulas for power gain decibels and voltage gain decibels [duplicate]

I know that my problem with this is some flaw in my logic, I just need someone to point out to me where that flaw is. According to the Wikipedia article, there are different formulas because power ...
2
votes
5answers
118 views

Given an Op Amp where the output voltage is fed back into the negative terminal, why is the gain one? [duplicate]

Apparently, the gain of this Op Amp is one, but I can't see how I could figure that out. Can someone help?
0
votes
2answers
86 views

Gain of a circiut

I have been asked this question: Identify the gain of the sensor circuit. If the gain is \$\dfrac{V_{out}}{V_{in}}\$, then won't the gain be dependent of the thermometer's resistance? At 0°C, ...
0
votes
3answers
126 views

High-Gain Common Emitter Circuit

I am trying to design a high-gain common emitter circuit. I know that I need to use a bypass capacitor with emitter resistor to increase the gain. My problem is the formula A = Rc / re makes things ...
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votes
2answers
119 views

What is the difference between Rf Gain Blocks & IF Gain Blocks?

As advertised on websites of large manufacturers like Analog Devices And Texas Instruments I am aware of the difference between an IF stage and an RF stage, however, I was curious if there was any ...
0
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2answers
146 views

Is a subwoofers RMS/peak wattage rating subject to the enclosure type?

The RMS and peak wattage rating of a subwoofer (or any speaker) show afaik how much power it can safely handle without damaging it. But is this true for both sealed and ported enclosures? (assuming ...
-4
votes
3answers
346 views

LM358 output voltage non-zero even though input is zero [closed]

I tried this experiment with LM358 and LM741. I used the circuit mentioned from this question: I have not connected any input source. But I am getting an output of 7.5V. I used R1 as 130 Ohm and R2 ...
0
votes
0answers
52 views

Circuit to fix the amplitude of the sine wave

Does anyone have any idea on how to stabilize the various input amplitude of the sine wave for example 1.3V,0.8V to 1V of frequencies between 0 to 10Mhz? I known that a variable gain amplifier can ...
1
vote
1answer
99 views

How are the gain and corner frequencies calculated for this speech bandpass filter?

This speech bandpass filter circuit appears in the TI OPA344 datasheet. It says "G = 100" and passband is 300 Hz to 3 kHz. How is the gain and corner frequencies calculated from the various ...
7
votes
4answers
2k views

Choosing resistor values for non-inverting amplifier and why?

The gain here is A = -Rf/Rin. However, lets say I want a gain of 10 V/V. Which resistor value would you choose and why? I know that you could have infinite number of combinations for these ...
1
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1answer
125 views

Gain of this schematic

I am interested in the following compressor, which I reverse-engineered from a pcb (there might be some mistakes, but I don't think so) (open the schematic in a separate window to see the small ...
1
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2answers
79 views

How important is the temperature stability for gain - setting resistors?

When two resistors are used to set a gain of an opamp, do I need to care about their temperature stability, provided resistors are from the same series, same manufacturer? Let's say my circuit will ...
3
votes
2answers
237 views

Problem with Wien's Bridge basic working and simulation in multisim

I am very new to the concept of Wien's bridge and am trying to make a basic circuit of it but didnt get the expected output (noise only).Tried to simulate on Multisim but got the same output.I have ...
4
votes
2answers
102 views

How to know the gain of my opAmp

I'm having a LM358 opAmp with the following Schematic, as I'm not from Electrical background, can you please help me determining it's gain. I just want to find out it's gain. simulate this ...
3
votes
2answers
115 views

How is the gain/phase vs frequency measured for opamps?

Opamp manufacturers post graphs like these in datasheets: How is the data for this graph measured? Is it calculated using the mathematical model of an opamp?
1
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0answers
48 views

Are RF gain blocks suitable for making VHF oscillators? [closed]

E.g., can I use them in circuits as active filters with positive feedback to generate VHF? Can't find models to simulate them. Is it possible to obtain them somewhere? The model I'm particularly ...
2
votes
2answers
296 views

Gain in Common Emitter Amplifier

I need to design an amplifier having a Vin=150mVp, 1khz; Vcc=3V that can run an 8ohms, 0.25 watts speaker, with a gain for about 7 without noticeable distortion. Below is my designed voltage divider ...
2
votes
2answers
248 views

How does the fuzz face guitar pedal actually output any gain to the input signal?

I'm referring this this circuit right here: I do not understand why the circuit would be designed like this and why the output wouldn't be drawn from the collector of Q2. I have 2 questions, which ...
2
votes
2answers
901 views

Op Amp gain less than 1?

How would I design an op amp with a gain of less than 1? Is this even possible? Also would it matter if I used a non inverting or an inverting op amp? I've designed a non-inverting op amp with a ...
0
votes
0answers
54 views

Calculating gain, input and output resistances of a current amplifier circuit

In the circuit below, I want to calculate the gain, $$\frac{I_{out}}{I_{in}}$$ as well as the input and output resistances. I wrote the node equations for the two nodes: $$V_x ...
1
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2answers
144 views

Advice for my Voltage controlled Amplifier

In class we are designing a VCA together as part of a bigger circuit. The aim is that we have an input of speech and an input of music and when we speak the the music reduces in volume. The speech ...
1
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1answer
93 views

(Ideal) Amplifier networks/nullors - determining the gain

I am having trouble understanding how the different amplifier networks actually do "their magic". In these networks a nullor is a unite that has always 0 voltage over the input and no current through ...
0
votes
1answer
50 views

How to find the gain of Motorola operational amplifier?

How to find the Gain in dB for Motorola operational amplifier MC33282P (for T=25°C). The manual has only abstract figures.
2
votes
1answer
216 views

Distortion in the output of amplifier circuit using uA741 + schematics and graphs

I'm simulating an audio amplifier with uA741 in pspice (student version). The input signal is a 0.1v (100mv) sine wave with frequency between 1kHz and 10kHz. The theoretical gain is 33 but in ...
0
votes
1answer
125 views

Question about AD834 + AD811 as voltage controlled amplifier

According to page 15 of AD811 datasheet , it can be used as a voltage controlled amplifier in conjunction with AD834 . In the schematic below, I am a bit confused about the configuration. If we ...
2
votes
1answer
184 views

Gain vs ADC performance vs ADC settling time

I have some basic doubts in ADC conversion. I am using AD7798 ADC. I am reading ADC values using AT90USB1287 micro controller using SPI communication. I am able to read ADC values perfectly but i have ...
1
vote
2answers
257 views

How to control the gain of FET/BJT/Op-Amp amplifier by input voltage range?

Assume I have an input voltage ranging from 5-10 MHz and want to amplify it. The case is pretty simple as any device as FET,BJT or high frequency op-amp can do the amplification well but I have a ...
1
vote
0answers
146 views

Differential amplifier problem

I really can't determine what my professor meant by this. He wanted me to calculate parameters of BJT differential amplifier that will have -100 amplification for signals difference and -1 for their ...
0
votes
3answers
432 views

How to design a unity gain with LM358 op amp?

I am trying to get a unity gain out of an LM358 to increase the current of an AC sine wave input from 5mA to something slightly higher. I thought I had it hooked up correctly for unity gain, but most ...
2
votes
2answers
572 views

LM386 with Gain of 40

I am trying to build one of the example circuits in the LM386 datasheet (any of the first 3) but with a gain of 40 rather than 20, 50 or 200. I understand that the gain is controlled by the impedance ...
2
votes
2answers
1k views

Gain of common-emitter BJT amplifier with bypass capacitor

I have this common-emitter BJT amplifier: simulate this circuit – Schematic created using CircuitLab The text book says that with a bypass capacitor, the gain is -Rc/re, where Rc is ...
2
votes
3answers
449 views

Resistive sensor reading ADC

I have to make an ADC conversion with an ATXmega MCU, in an air quality application. The input is a voltage divider between a voltage reference. The sensing resistor vary in relation to a gas ...
3
votes
1answer
323 views

How can I modify this circuit for a higher gain?

Here is an image of an amplifier circuit. How can I modify this for a 10-50 times more gain. I put a wire from pin 1 to 8, but I didn't get enough gain.
6
votes
4answers
537 views

Confusion between Voltage gain & Voltage gain in decibels (dB)

The definition of the Voltage Gain is \$ V_{out} \over V_{in} \$. However, I read some articles about the gain in decibels, and I have a confusion now. Here is an article about it: ...
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votes
1answer
209 views

what is the gain of this amplifier at resonance frequency?

I want to analyze this circuit but I do not know how to compute its gain at the resonance frequency. In lab its gain at resonance frequency (910kHz) was 54.
4
votes
1answer
125 views

Least noisy pre-amplifier design

I am building a frequency generator circuit and need some advice. I am using the AD9833 DDS generator (programmed from a PIC16F876) to generate frequencies and I wish to be able to adjust the gain. ...
1
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2answers
266 views

Does gain affect stability of a Transfer Function?

I have a control system that we are working on with a forward transfer function of:- \$ \dfrac{K(2s+3)}{s^2(s^4+2s^3+4s^2+2s+7)}\$ So I've set up the routh table for this, I've found there are 2 ...