Questions tagged [frequency-response]

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90 views

How to explain the peak frequency and resistance relationship in this op amp circuit?

I was studying thid tutorial by Simon Bramble. I changed the original circuit a little bit and this is the subject of our discussion: As you see, R1, R2 and R3 are all 1kOhm. When I run an AC ...
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0answers
48 views

General question about convolution and Fourier

I'm working on a system that includes a bunch of elements and I arrived at the following general expression for the output: $$\mathcal{F}\left\{ T\cdot\left(\left[T\cdot\mathcal{F}\left\{ E_{1}\right\...
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43 views

Improve the frequency of Current Source Howland effect Op-Amp

I need help on a Howland Effect circuit with a current source purpose with an output of 600mA and a constant gain throughout a range of frequencies starting in 0Hz to 1Mhz. I am currently using an ...
2
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1answer
113 views

frequency response multistage

hello every one i need ask about frequency response i have an old question of our professor exam in few year, and i try to solve this question many time but i can't so please if any one have idea ...
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1answer
48 views

Emulate impedance response using RLC components

I need to emulate measured impedance response of some blackbox using only RLC components. Measurements: ...
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37 views

Frequency response measurement problem with mobile phone: same (wrong?) readings for different speakers

I have built some bespoke speakers and tried to measure their frequency response. My rig is: Source: Android phone Samsung A3 as a source, playing frequency sweep using Android's Frequency Generator ...
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1answer
87 views

Why does this ramp generator drop level outwith 60Hz / 10kHz range?

I found the following circuit in an old Elektor article: It is a [edit: ramp generator] that repeatedly (a) charges C3 through R4 to build a ramp, and (b) briefly shorts C3 across T1 to reset the ...
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0answers
26 views

Differentiator Op-amp with a triangular wave

I’m trying to create a differentiator op-amp. The input signal is a triangular wave of frequency 100Hz and amplitude 1V. The circuit I have designed features a series resistor (Rin) and capacitor. ...
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28 views

Determining Z1 for voltage divider of RF Matching Circuit

I have a problem where I was given an RF circuit with a series RL load. I am tasked in finding a matching L circuit and determining the values of the components. I used a smith chart to determine that ...
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79 views

2 Crossovers in parallel: how are frequencies distributed?

So, the other day I connected on parallel a dual-voice subwoofer-system (a Pyle XSUB1-150-4-12d crossover — like this one ... link might be unavailable after Aug 28, 2019 ... — and 2 individual ...
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1answer
172 views

Simple OP-AMP Frequency Response

In my textbook, there are two interrelated equations. 1. wb = wt / (1 + R2/R1) 2. wb = wt / Ao where ...
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125 views

Frequency response of linear DDS chirp

I am performing a linear frequency sweep from 80 MHz to 120 MHz in 26.84 ms with the AD9910 direct digital synthesiser. I experience that the output amplitude is not constant (see Figure 1). With my ...
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1answer
3k views

OrCAD PSPice less than 2 connections error while simulating

I just started using PSPice and I don't know much circuits theory but I need to simulate this circuit and find Vout/Vin: I did this using capture but after running simulation I get this error: ...
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1answer
347 views

Increasing frequency response instead of gain for a Cascode circuit

so this a homework problem that I am working on and I'm not looking for a flat out answer, just a good place to start and some help on the concept. So the question is as follows: Suppose our ...
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69 views

Frequency response - all zeros smaller than all poles?

For the following circuit the middle band gain is: \$A_v=-g_mR_D\cdot R_{in}/(R_{in}+R_{sig})\$, where \$R_{in}=47\cdot 10/57=8.25M\Omega\$ and \$R_D=4.7 || 10k\$ The total resistance which the ...
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36 views

Gain error calculation for op-amp circuit in inverting configuration

For an inverting op-amp, calculate minimum gain that is required for the op-amp to achieve a gain error of 1%, if the required closed-loop DC gain is -9. If the input resistance R1 is 1Kohm,find the ...
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25 views

Realisation conditions for impedances

Given a frequency function, which conditions should it fulfill to be realisable and implemented as a one-port impedance? I know that for it to be realisable with passive RLC components, the frequency ...
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56 views

How to separate magnitude and phase response in Proteus?

I have an all-pass filter in Proteus, which in theory doesn't change phase. but changes amplitude. How can I see both of the graphs? Here are the needed scheme and its analogue in Proteus. Although I'...
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30 views

How to Select Prony Method Order?

I'm implementing a Prony decomposition to analyse power system signals in python. I think the code is generally working, but reconstructing a signal from the decomposition shows that it's not "perfect"...
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50 views

Frequency Response of Current Transformer?

I want to get frequency response of an CT in practical applications. Current transformer is nonlinear systems and i want different ways to get it in practice. Which software is better for analyzing ...
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89 views

RFI filter modeling in LTspice w/ triac

I have a few questions about modeling an RFI filter in LTspice with a triac-based dimmer circuit. I'm referencing the circuit described in Figure 11 in Triac Principles and Circuits -- Part 2 (Nuts &...
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1answer
112 views

Replacing s with jw in transfer function. When the input function is oscillatory and has exponential decay

I understand a version of this question has been asked numerous times before but I could not find an answer to this specific one. This is how I understood replacing s with jw. From the impulse ...
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11 views

Insertion loss measurements, frequency sweep vs measuring points with a constant driving frequency

I have been modelling a surface acoustic wave delay line, and am trying to clarify what I am seeing in the different models and whether this is applicable to what would occur experimentally. In the ...
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1answer
38 views

Designing a network to fit specific amplitude and phase response curves

If we are given a frequency response curve made up of the amplitude (magnitude) and phase (angle) responses, is it possible to design an electronic network with a transfer function identical to the ...
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2answers
218 views

Fitting of continuous transfer function

I measure a network's transfer function using a network analyzer and therefore have a set of complex data points, representing the network's gain and phase. I wish to fit a continuous, rational ...
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1answer
76 views

Determine capacitor value gives amplifier characteristic independent of frequency

I have an amplifier for the needle EMG electrodes signal like image below. The question is : Determine the C2 capacitor value gives electrode–amplifier characteristic independent of frequency. Can you ...
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1answer
43 views

What's oscillatory instability in the delay differential equations?

Does DDE’s stability depend on forcing term and ODE’s stability does not depend?If yes, then is frequency analysis of stability applicable only to DDE and not ODE? In control systems, we study ...
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1answer
60 views

Can't draw bode curve of this zero

I have a transfer function like this: \$H(s)=\frac{s^2+\frac{1}{LC}}{s^2+s\frac{R}{L}+\frac{1}{LC}}\$ I can separate the denominator into an expression of the type: \$(1+s/a)(1+s/b)\$ and then plot ...
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72 views

Determining the phase margin of a negative series-shunt feedback circuit

I have been given a transfer function: \$H(s)={A_0\over (1+s/w_{p_1})(1+s/w_{p_2})} \$ With the condition that \$w_{p_1} << w_{p_2}\$ It's designed for this feedback circuit ...
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77 views

Necessary phase shift of op amp

My lecturer said that, for any system where the amplitude response varies with frequency, such as for an op amp, there will necessarily be a frequency-dependent phase shift between the input and ...
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1answer
63 views

Would crosstalk be an effect at < 1 kHz signals up to 2.2A?

I'm planning on the use of a current transducer to monitor the current of an induction motor (full load amperage = 2.2A @ 60 Hz). (Link of current transducer, model: LTS 6-NP) If I connect the input ...
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105 views

Miller's theorem and CS cascade

In the above circuit I was asked to find the input capacitance at the gate of Q1, Cg1, using the Miller approximation, to determine the frequency of the pole formed at the amplifier input in terms of ...
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1answer
233 views

High freq. response of op amp using Miller

I am trying to find the -3dB freq. denoted \$f_H\$ in the following circuit, where \$R\$ has been replaced with a capacitor \$C\$. I tried doing that in two ways which yielded different results. I'd ...
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2answers
66 views

Frequency response and the effect of phase

Lets say I have a low-pass filter in a sound system. I draw a magnitude and a phase diagram as a function of the frequency. Disregarding the magnitude, how does just the phase affect the sound we ...
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29 views

Mid- and lowband frequency response of CE

I'd like to derive an expression for the small signal voltage gain \$A(s)=V_o/V_{sig}\$ that applies in the mid- and low frequency bands. I know that for a CE the voltage gain would be: \$A_v = -...
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1answer
65 views

3-dB frequency of cascaded opamps

We have two identical opamps with a first order low-pass response. They both have the same 3-dB frequency \$f_1\$. I need to show that their combined 3-dB frequency (when they are put in cascade) is: ...