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Questions tagged [amplifier]

An amplifier can be used to adapt the range of a signal to a requirement, to make it more robust for transmission, or to satisfy interface requirements (like input/output impedance).

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Working of differential pair using MOSFETs

I am currently learning about differential pair using MOSFET from this course. In this particular lecture, the teacher says that to have a differential pair we need to apply the second signal v2 at ...
tinkerer's user avatar
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Design Review of a 5 Transistor HF RF Transmitter

Below is a simple (5 transistor) 7 MHz CW Transmitter. It is designed to be simple to understand and build (no ICs, no SMD) while transmitting approximately 5W CW. I'd like to ask for a design ...
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Help Needed: Time Response and Laplace Transform of Transistor Circuit [closed]

I need assistance with solving the following circuit problem. The task involves two main parts: I need help with the following circuit problem: Find the time response of the circuit. Write the Laplace ...
Alon Malka's user avatar
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Audio amplifier setup is triggering headset button detection [closed]

I have a laptop I swapped in with an existing desk setup that includes a mixer for the audio from several computers an amplifier that I use to split the microphone from my headset between all the ...
Allen's user avatar
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2 votes
1 answer
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Why does a MOSFET fail on fast signals, even if they're much longer than the turn on + turn off times?

When running at a fast signal, why does the MOSFET below not turn off, even when gate voltage is well below threshold (even negative)? Although the signal is fast (7 MHz, 140 ns period) it is < 1/...
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Impedance matching T/R switch

I do drive a piezo as transceiver. My transmitter provides square burst around 10Vpp which is too big for simply switching through a diode by dc biasing. I found out that bridge rectifier structure ...
ali demir's user avatar
-2 votes
0 answers
29 views

Two Amplifier Circuits using for Reading Temperature Sensor [closed]

Can I read one thermocouple sensor with two bias current/voltage applied amplifier circuits simultaneously? Is there any problem over there?
jacks's user avatar
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1 answer
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Please help me identify this IC - top marking "CEK"?

Please help me identify this IC - top marking "CEK" such as picture below:
HNLinh's user avatar
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-5 votes
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URGENT URGENT HELP PLEASE [closed]

I have a question i hava a Dixon 8 channel pro mixer amplifier want to know the diode is a KBU1006 is there a more compatable stronger diode or not I[enter image description here][1]m thinking to by ...
IAN's user avatar
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0 answers
56 views

Regarding the voltage in the resonant circuit of a Class F amplifier

When checking the operation, the secondary resonant circuit discharges. When I checked with ADS, I confirmed that the voltage was not high enough to cause a discharge at 150V or less. Regarding the ...
kimura's user avatar
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-3 votes
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VLSI, multistage log amplifier with mosfet [closed]

How can we make multi stage log amplifier with mosfet? any reference?
Dhruv Patel's user avatar
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1 answer
60 views

Why input signal of negative feedback amplifier is Vs - Vf?

The block diagram below is from my textbook. I don't understand why the input voltage Vi = Vs - Vf. Take an example as the image with numbers on it, I know its not correct in reality but just assume ...
Thành Nguyễn's user avatar
1 vote
1 answer
62 views

How would one calculate the transconductance of the FETs in this circuit?

I was given formulas to find the transconductance (gm) of the FETs using IDSS, VP and VGS, however, none of the ways I tried them leads to the correct answer (given as 2,55mS).
Alonso Vargas Sabean's user avatar
2 votes
1 answer
114 views

Please explain the purpose of R3 and R4 in this ground isolating amplifier

This schematic can be found here on page 15: Here's what I do understand (I think): The ground noise is common mode voltage, and the amplifier has high CMRR, so it gets rid of the ground noise at G2 ...
charles's user avatar
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1 answer
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50 Hz 2.5 Vpk-pk signal amplification [closed]

I get a 49.8 Hz 2.5 Vpk-pk sine signal. I want to amplify this signal and drive a 22 Ω resistor. Do you have a chance to provide an example of amplifier circuit design? As a result of this upgrade, ...
Ozan AKYOL's user avatar
3 votes
4 answers
780 views

Why should the Vce be half the value of the supply source?

For a BJT amplifier biased to operate in the active region; I think that the statement "the voltage Vce is half the value of the supply source" is incorrect. Because I know that such a thing ...
manrupe's user avatar
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1 answer
102 views

Aviation headset amplifier

What type of amplifier is on the market or can I use to get my microphone to work? I am converting a British combat headset to use in an open cockpit airplane. Right now current headsets just don't ...
Stephen's user avatar
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Looking for feedback on audio schematic [closed]

I'm making an mp3 player and I'm looking for feedback on the audio side. It takes an i2s input from an esp32(not in this sheet), and outputs to a headphone jack. This is my first audio project (...
Rufus Ahern's user avatar
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1 answer
41 views

How to solder the central pin of the TGA 2214-CP microwave amplifier

Here is datasheet of the TGA 2214-CP amplifier: TGA 2214-CP The pins can be seen on page 11. It turns out that pin 7 and 9 are very close to the central pin 1, as well as pin 8 and 10 to pin 2 (about ...
MikeTeX's user avatar
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0 votes
1 answer
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Filter for supply voltage of amplifiers

I need to design an ultra low noise amplifier in transimpedance architecture. This is the architecture I have chosen: In addition to the decoupling capacitors on the supply pin I have also added two ...
Andromeda's user avatar
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2 answers
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Issues with Audio Amplifier Circuit - No Output Signal with Capacitor, noise

I'm having trouble with an audio amplifier circuit that I designed, and I hope someone can help me figure out what's wrong. Here's the schematic of my circuit: Rsig is a variable resistor The circuit ...
CHIEN LE's user avatar
1 vote
2 answers
63 views

How can a Class E Power Amplifier be built and experimented with safely?

Given that Class E RF amplifiers, even those that generate less than a few watts, can easily generate voltage spikes approaching (or exceeding) 100 V, how can they be homebrew built and experimented ...
SRobertJames's user avatar
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1 vote
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Amplification Calculation

I have a question about how to calculate the amplification of amplifier. Here is the circuit: The equation provided by in the datasheet for calculating the output is: CURphase = VOFS - amplification *...
WC_iOS's user avatar
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1 answer
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What is the purpose of the diode in this complementary class B amplifier?

For this circuit, why did we use a diode between the bases of the two transistors?
FISqrt's user avatar
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1 vote
1 answer
86 views

Are there safety concerns with hooking an inductor to a MOSFET and generating 85V spikes from a 9V source?

Are there safety concerns with hooking an inductor to a MOSFET and generating 85V spikes from a 9V source? Looking at the circuit below, I can generate this from a 9V battery. Is this safe? It's on a ...
SRobertJames's user avatar
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3 votes
3 answers
155 views

What happens when you insert an inductor between Vcc and a MOSFET's drain?

Inserting an inductor in between Vcc and a MOSFET's drains can cause some very large voltage spikes, depending on the exact inductor value: I'm having trouble analyzing it properly, though. For some ...
SRobertJames's user avatar
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0 votes
2 answers
160 views

LTSpice simulation produced different results of phase margin when using step-signal % overshoot technique vs loop analysis technique

I am working on a class AB amplifier circuit to that can output both AC and DC current, controlled by an op-amp with feedback from the final output. The output will be driving an 50uH inductor. The ...
Zhi's user avatar
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1 vote
1 answer
64 views

Why does the voltage increase when I connect this amplifier to a gate driver?

I'm trying to breadboard a simple circuit testing a TI UC3708N gate driver, which I need to drive from an AWG square wave. Since the AWG has limited amplitude (and perhaps limited current), I made ...
SRobertJames's user avatar
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1 vote
0 answers
28 views

Looking to identify and find an equivalent varistor for a Crest ca9 amplifier

I picked up a Crest ca9 amplifier over the weekend knowing it needed work when I plugged it in And turned it on it. Started letting the smoke out. Long story short, I found a varistor That had blown. ...
Caleb McGinnis's user avatar
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0 answers
41 views

Achieved SNR is different than the simulation results

I have designed a transimpedance amplifier as follows: Based on the simulation, I should get around 58 dB for SNR @3MHz: But what I achieved in my experimental results is as follows: Supply voltage ...
Andromeda's user avatar
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1 vote
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60 views

Choose Transistor and Op-Amp for Constant Current Source Driven by Microcontroller

for my project I am trying to provide a current source to a heater (load in the diagram) on a PID loop to keep an object at constant temperature. A thermocouple is attached that reads the temperature. ...
Will Brunner's user avatar
-3 votes
1 answer
85 views

How a car inverter can diffuse 16 A 230 V if the input is a 12 V car battery? [closed]

I have found this car inverter We say that the power is kept between the input and the output of an inverter like in this thread, so if the voltage in the output is higher and stepped up, the current ...
John Mary's user avatar
0 votes
1 answer
105 views

Modifying TI schematic to learn more about amplifiers

Let me start off by saying that I'm a complete beginner. I've watched some videos on amplifiers and read about them but it's hard for me to analyze circuits that don't match exactly to the examples I ...
Ivory's user avatar
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4 votes
3 answers
476 views

Audio engineering: amplifying two different sources

I've started a small project to renovate/rebuild an old record player for my wife. I have a degree in Electrical Engineering, but it's been almost 15 years since I last had to project/build a circuit, ...
Yuri Oliveira's user avatar
-1 votes
0 answers
50 views

Low amplification in comparison to my simulation results

I designed a transimpedance amplifier by OPA837 as follows: The negative input of OPA837 is connected to a ultrasound transducer, which is a current source with the following characteristics: C=1nF, ...
Andromeda's user avatar
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1 vote
0 answers
81 views

MOSFET feedback mechanism

I made an simple feedback circuit. R2 and R3 is voltage divider there so I'm setting them sufficiently big values. But in this setup, it works with 2N7002 and not IRFZ44N (gain is way less then I set ...
ali demir's user avatar
0 votes
2 answers
49 views

Bridge Tied Load Amplifier Measurement - Oscilloscope Probe Ground Reference

Apologies, my electronics is a little rusty. Wanting to measure the output of an bridge tied load amplifier and getting a little confused as what to use as the ground reference signal for the ...
user avatar
3 votes
1 answer
62 views

RC series analysis with H parameters model

I'm writing this just to be sure I understood well the process of analysing a circuit with the \$H\$ parameters model. In this case, it is a very simple example of application; the circuit I'm ...
deomanu01's user avatar
-1 votes
1 answer
92 views

Why isn't this inverter based amplifier amplifying?

I was studying about CMOS inverter an amplifier for analog applications instead of its more well known application as a switch for digital circuits. For the following inverter based circuit : I think ...
Koustubh Jain's user avatar
0 votes
0 answers
43 views

Finding poles of the transimpedance amplifier

I`ve been having problems with finding poles of one transimpedance amplifier. Acording to LTSpice the first pole should be somewhere around 1.6MHz, but I cant get that (I am getting about 200MHz). I ...
Огњен Пискулић's user avatar
2 votes
2 answers
118 views

Is my solution to this differential receiver circuit calculation correct?

I solved the difference receiver circuit problem in the picture with the following formula but I am not sure of its correctness because I do not have an answer key. I would like to discuss whether it ...
softcalculate's user avatar
1 vote
3 answers
131 views

Does this op amp connected to an LC tank amplify its resonant frequency?

The circuit below has a resonant frequency at 159.155 kHz and should amplify it: That's exactly what this sweep predicts: But,even when setting V1 to 159.155 kHz the transient analysis shows no ...
SRobertJames's user avatar
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1 vote
0 answers
83 views

Amplifier design using MOSFET

In designing an amplifier, I can have gain and make the MOSFET work in sat region, but the problem there is the \$V_{ds}\$ and \$V_{gs}\$ voltage was not designed. How can I make a more precise design?...
ali demir's user avatar
0 votes
0 answers
96 views

Designing a 0.18-µm CMOS Multi-Stage MOSFET Amplifier (150 V/V Gain, 1-5 GHz) Without External Resistors/Capacitors

I'm working on a project to design a full-transistor-based (MOSFET) multi-stage amplifier using 0.18-µm CMOS technology. The requirements for the amplifier are as follows: Voltage gain of at least ...
Raczidian's user avatar
1 vote
0 answers
65 views

How to generate a 50-100 Hz 12 Vac sine wave for audio tone from 5 VDC (PB0 pin) atmega164p microcontroller [closed]

I have programmed to ATmega 164P to make PBO high when PC1 is low. In programming, I'm adding other peripherals as well. But I am facing one issue regarding generating a tone. I have drawn low pass ...
Traffic t's user avatar
0 votes
1 answer
69 views

What voltage comes from a standard 6.3 mm instrument cable?

I am designing an electric percussion instrument using various metal strings and objects that are hit my solenoids. Pickups record the sound.I need to know what kind of voltage and current instrument ...
Crisps's user avatar
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1 vote
0 answers
35 views

Output Noise of MOSFET with parallel current source

How can I calculate output noise voltage of the given circuit? Noise contribution of the M1 to output noise current: $$4kT\delta g_{m1}$$ Noise contribution of the RG to output noise current: $$4kTR_G[...
Aldrich Taylor's user avatar
1 vote
1 answer
49 views

Voltage and current gain in two stage BJT amplifier

In the two stage amplifier bellow, by doing the DC analysis you will find the bias currents \$I_{C,T1}=3.71mA\$ and \$I_{C,T2}=5.48mA\$, if I am correct. In order to find the voltage gain from Base ...
Mamamama's user avatar
1 vote
0 answers
58 views

Is there a DC voltage on a transmitter power amplifier's output?

When studying the answers to Are my power calculations on this MOSFET Power Amplifier accurate? , I noticed this contradiction: If you integrate V * A, you get ...
SRobertJames's user avatar
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6 votes
2 answers
326 views

Are my power calculations on this MOSFET Power Amplifier accurate?

Thanks to the help of electronics.SE, I've designed my first power amplifier, intended for transmitting CW on 7 MHz. Before I order parts and build it, I'd request a design review. One important note:...
SRobertJames's user avatar
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