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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32 views

Op Amp gain modification from kenwood krf-7060d

Hi, I have an kenwood krf-7060d, which has an subwoofer line out that is very very "quiet". The top part of the schematic has the final opamp (sw out) before the acutal output. Can someone tell me ...
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Using a PGA to scale input voltage ranges?

I have a current design of a circuit which works well, but I am needing to make a few extensions to it. I am working on a 4 channel oscilloscope. Each channel must be able to take various ranges of ...
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Alternative to potentiometer for setting guitar volume

I'm trying to build something to change the gain of a line- or instrument-level signal very steeply using a microcontroller, to use as a guitar tremolo pedal. I've been looking at digipots but can't ...
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Can someone please explain this Bluetooth Antenna Test Result, I am new to RF?

This is the test of a Bluetooth (BLE 5.0) passive antenna test result. I am new to RF and do not know how to properly interpret this result.
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Can someone how to find this voltage gain neglecting r0

I'm trying to figure out why my professor starts off the way he does when trying to find voltage gain. How he starts off is shown in the last picture. Any explanation would be appreciated.
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Setting gain on Improved Howland current source (best practice)

I understand that you can set the gain of an improved Howland by setting the the ratio of resistors \$R_2\$ and \$R_1\$ and/or the value of \$R_{\text{set}}\$. Is it better to leave the ratio of \$...
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How can i have the max gain, lowest electric power and max output swing for this circuit?

okay so here's my circuit. R1, R2, VinM1 and VinM2 can be changed in a way to have the max gain, max output swing and lowest electric power used. Also, I need this circuit to be analyzed. In other ...
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Finding 70% Voltage Point

Let \$v_1\$ be the input AC voltage and \$v_2\$ be the output AC voltage such that gain \$\dfrac{v_2}{v_1} = \dfrac{A+jB}{D+jE}\$ where \$j = \sqrt{-1}\$. How should I find the 70% point (the point ...
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Is there any device for measuring phase and gain of a device in frequency range as low as 0.1 Hz?

I need to measure phase and gain of a circuit starting from 0.1 Hz to 10 MHz. Most of VNAs are for frequencies of several MHz to GHz. I've just found one VNA for 1 Hz. Is there a device or method to ...
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What is the gain of this capacitance measurement circuit?

To sense the capacitance value of a sensor, I found the following circuit. My knowledge on analogue electronics isn't that great, so I'm not sure how I'd determine the gain of this circuit. Vo is ...
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Gain of single input differential amplifier

When performing the small signal analysis of the circuit shown below, with \$ V_{1} = V_{in} \$ and \$ V_{2} = 0 \$, and output taken from \$ V_{02}\$, I consider the small signal model for half of ...
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Gain compression on an Ids vs Vds curve in Power Amplifiers

I haven't found a single document that talks about "Gain Compression" in a power amplifier referring to the typical Ids vs Vds curve. Books talk about a sinusoid "clipping" when showing these curves ...
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Linear Circuits - Erroneous first order gain observation

At uni, I carried out some lab observations involving a CR circuit (4V AC power source, capacitor, resistor in series, in than order) with the following parameters: simulate this circuit – ...
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28 views

OC-voltage-gain for cascaded amplifier

I have the following problem. "An amplifier stage with \$A_{voc}=100\frac{V}{V}\$, \$R_i=100k\Omega\$, \$R_o=10k\Omega\$ is connected to another amplifier with \$A_{voc}=10\frac{V}{V}\$, \$R_i=10k\...
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Order of op amp cascade to reduce noise

I am currently designing a little circuit to amplify a weak signal with two sequential op amps. To reduce the noise at the output of the two amplifiers, what would be the best order to place these ...
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What is the small differential gain?

Circuit 1: is the original circuit, circuit 2: Half circuit, circuit 3: small signal model For this circuit we are assuming lambda=0 Our solution: Vin=Vgs1 Vout=-gm3*Vgs3*R1 Av=Vout/Vin=(-gm3*Vgs3*...
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DC voltage gain vs AC voltage gain, are those the same?

Is the DC voltage gain the same as the AC voltage gain un a multistage amplifier? I mean, if the last stage have Vo2 as the input and Vo3 as the outout and Vo3/Vo2=1V/V is it correct to say that that'...
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sallen-key bpf giving low gain after coupled to differential input

I designed a Sallen-key band pass filter where the gain at center frequency is 45.6dB. After feeding it with a sine wave at the center frequency, it amplifies the signal by 45.6dB. However, after ...
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Forward path gain

Consider a simple circuit consisting of a pair of wires, where input voltage is equal to output voltage. Here forward path gain is G(s) = 1 ,(fig.1) which gives g(t) = δ(t) {Inverse Laplace ...
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263 views

How does opamp open-loop gain affect closed-loop gain in a circuit?

The gain of an opamp circuit is basically $$A_v=-\frac{R_f}{R_i}$$ But how come the gain of the opamp itself does not appear in the equation? How is the opamp amplifying anything in the circuit? What ...
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58 views

How to make gain margin 6dB

So I have a non-inverting opamp configuration R1=20k and the system starts to oscillate if R2 is less than 20k. I need to make the gain margin equal to 6dB by choosing the right value for R2.
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Need help in designing a BJT Amplifier with Avnl = 100

For our final project, we need to design a "single-stage BJT-based highpass amplifier using voltage divider configuration". The amplifier has the following requirements: \$V_{CC} = 12V, f_L = 300 Hz, ...
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62 views

Op amp output voltage swing vs noise

Staying within an op amp's specified output voltage range, how does a difference in output swing affect the op amp's noise applied to the output signal? Obviously by increasing gain, we amplify the op ...
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What actually is the differential gain of an operational amplifier and why does its value change when we consider the common-mode gain?

Okay, this may be a stupid question, but at the beginning of my Applied Electronics course they taught us that the differential gain \$A_d\$ of an operational amplifier is ideally infinite; however, ...
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Parallel Electrets - working BUT

I know this question is similar to the previous one, but it has a slight tweak. I have 4 electret capsules in parallel supplied by 5V (USB supply). They work fine (so I guess the current hasn't ...
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Gain & Phase of a transfer function

can anyone help me calculate the gain and phase angle of the following transfer function for a low pass filter at a frequency of 130 rad s^-1: G=1/(1+jw/260)
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What is the gain in a non-inverting amplifier

I am unsure if I am tackling this problem correctly. The input signal is connected to terminal E4 and the output signal is observed at terminal E9 What is the voltage gain when E1 is connected to E5?...
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88 views

Transimpedance Amplifier Gain Analysis

I'm trying to go through a mathematical gain analysis of a closed-loop transimpedance amplifier circuit, but I'm having issues trying to relate the block diagram to the actual circuit. simulate this ...
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104 views

Understanding what is meant by the magnitude of an Op-Amp's gain?

A particular problem I've been given shows two Op-Amps, which can be seen below: I'm asked to compute the magnitude of the gain. Not being quite sure what this means, I decided I'd figure out the ...
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73 views

Increasing the opamp gain is decreasing the DAC resolution

I want to control for example LM317 ADJ pin with a 12 bit DAC to get 1mV precision, it's an 0-5V DAC. In below schematic I increased the gain of opamp to two so I can achieve a higher voltage, but now ...
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Why can't I get maximum gain that can be achieved by LM358 op amps (gain < 3.6 !!!)?

I need to amplify the PT100 (temperature sensor) for giving it to an Arduino, so I used this circuit with LM358 (V1 and V2 values are not correct): The V2 AND V1 came from this circuit (based of ...
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Help with Op amp Circuit Design

Given the blue transfer function graph, I want to design a circuit that can replicate the characteristics, preferably using an op amp. This is what I have done: where the red circuit is the red curve ...
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80 views

Opamp input offset voltage when saturation

I wonder, how to affect the input offset voltage of inverting amplifier when it's output in saturation? I'm changing gain with decreasing the value of R2. When the gain is greater than 5, output in ...
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Power Gain in a Small Signal Mosfet Circuit

let's consider this circuit, which is the equivalent of a small signal Mosfet amplifier. where RG is a gate series resistance which takes into account of the oxide leakage, and CGS and CGD are the ...
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71 views

Two-stages class AB amplifier

I'm studying the following two-stages class AB amplifier: Basically it is a standard two-stages op-amp (i.e. the cascade of a differential pair with active current mirror followed by an inverter with ...
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87 views

Integrator with DC control gain

I am analyzing the integrator circuit and I can't get from which equation can I get the frequency where there is the intersection with x axis - 1/C*R1 ? Thanks! source
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INA125 gain problems

I'm trying to use an INA125 to read a load cell. Its connected as in the single supply diagram in the datasheet (see below). The gain should be 4+60K/Rg. However whatever resistance I make Rg, the ...
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102 views

Transistor Gain Values

I am design a transistor switch circuit. Ic = 1mA-30mA Ib = 1mA Vce = 7V-18V This is the transistor which I am going to use as an NPN Switch Can someone tell me how to read the Fig 7 graph. In the ...
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36 views

Digital signal into the video cable

The input signal is simply composite sync signal, without any additional video information. It is CMOS - 0 to 5V levels. I need the same type of signal to appear in the cable along with the RGB lines. ...
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About the differential gain [duplicate]

Let's consider any circuit which contains a differential pair, for example a telescopic cascode single stage OTA: In every circuit like this one, my professor and every book compute the small signal ...
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51 views

Gain of wireless antenna? (-3, 0, 3, 6) [closed]

I read somewhere that each time the signal strength doubles, the gain in dB increases by 3. So because it says each time it doubles, it has to start from somewhere, it means 0 db should have some ...
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243 views

Working of INA826 instrumentation amplifier for Pt100 RTD

The schematic below contains an INA826 used to amplify the resistance of the Pt100 RTD across J1. Gain is set to 10 through the 5.49K ohm resistor. Is this ciruit amplifying only the voltage across ...
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Antenna Gain Vs IP68 plastic enclossure

I would like to buy this IP68 plastic enclossure below for my electronic project: https://www.chinaenclosure.com/products/102-70-52mm-ip68-waterproof-plastic-enclosures-for-electronics-from-china-...
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Is the frequency response of a circuit only valid for steady state (phasors)?

This is my first post. I just finished a course about advanced circuit analysis techniques (the content was taken from textbooks by Sadiku, Hayt and Irwin.) As you know, phasors are used to solve ...
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To prove that Close Loop transfer function is sensitive to perturbation in H(s) but not to perturbations in G(s)

The feedback control system with high gain K is shown in figure
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Find the total gain from the following Signal Flow Graph

The signal flow graph for a system is given in the figure. Find resultant gain.
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350 views

Relationship Between Root Locus Pole and Percent Overshoot and Gain in MATLAB

I have a peculiar confusion regarding the relationship between a closed-loop pole on a root locus plot and its gain and percent overshoot. I have found a point on the root locus plot that MATLAB ...
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Gain with inversing Op Amp on Equalizer

I know I posted a question about this circuit before, but I'm running into a problem. I know this is a terrible equalizer design but I'm trying to learn to put in use what I learnt with Op Amps and ...
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Amplifier Transfer Characteristics

In a previous question I had this as the given: The transfer characteristics of a voltage amplifier are described by the following equation: vO = F + G vI with amplifier saturation levels at ...
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46 views

Amplifier Voltage

I'm studying for my electronics exam and for this particular problem I have: Av = –85 (V/V), Ap 21 (dB) power gain, Ap = 3.41 (W/W), L+ = +9 (V), L- = -6 (V). Now the next exercise asks that: ...

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