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Hi,
I have a system which its impedance, z = |z|∠θ, is variable and unknown and I want to estimate the impedance in this case I inject a sine current with a known amplitude and frequency to the system, I = sine(2*pi*f*t) and measured the output voltage.
So in this case we will have this...
Hi,
I am using an NI 9263 DAC converter to generate a 10KHz sine signal with a 5-volt amplitude. However, the problem arises when I zoom in on the output of the module, as it appears as shown below:
There is a 40mV difference in the peaks, which is causing trouble for me. I have tried changing...
Yes, I have the Symbolic Math Toolbox. I also have actual data. Ci and Ri, Vd are constants, while Cc(t) is a time-varying signal. In other words, it is not a known function; it represents a time-varying capacitor that randomly varies over time but I have this signal in MATLAB. Due to this...
Hi,
The equation regarding a circuit is shown in the attached picture. I have the parameters Ci, Cc(t), Vd, and Ri. I want to calculate a(t) in MATLAB, and I have two questions:
How can I calculate it in MATLAB? I tried writing some code, but it failed.
Is there any way to simplify this...
In fact, this circuit is related to the microneedle electrodes which are attached to the the skin surface in order to measure the voltage difference between two parts of the body, the electrodes are buffered by using Opamps to decrease the noise. So in this case in the right side of the picture...
*I measured the voltage with a analog to digital module as it is shown in the picture.
* No it is not for a single output. It is the difference between U2A Opamp and U2B Opamp output. In the right side of the picture you see the J1 connector, the difference between p10 and p11.
* I tied them...
Hi everyone,
I have come across an issue in a circuit that I would like to discuss. The circuit, shown below, exhibits an offset in the output. The output is given by (AI-5+) - (AI-5-). To investigate further, I short-circuited the input on the left side and observed that the output in this...
Hi,
There is a system, which its output is equal y(t) = s(t) + a(t), which a(t) is noise and we want to eliminate it from the output. We now the equation regarding a(t). a(t) = vd.(C(t)*h(t))/(Ci + Cc(t))+D which H(jw) = jw/(k(t)+jw). and we know the range of k(t). I've heard that by using...
When we cosider C is time-invarient and i = Cdv/dt, We get Laplace from both sides we will have ----> I(s) = C*(S*V(S) - v(0)).
But if C is time-varient and I = dQ/dt = C(t)*dV/dt + V(t)*dc/dt (However I am not sure this equation is correct for time-varring capacitor or not and if not what is...
Actually I am a bit confused about the differential equations and Laplace equations of the variable capacitor. maybe it is better to ask my quastion in this way. Consider the circuit below, the parameters with (t) are time-varient, the others are time-invarient.
I would appreciate if any one can...
Thanks for your response. I am talking about capacitive sensors which because of the movement the value of capacitor would be variable, as distance is changing (C=ϵA/d)-----> C(t)
Actually my question is we cannot write:
I = V/Zc, which Zc = 1/cjw, (this equation is written for constant...
Hi,
I have a question regarding variable capacitors. Consider there is C(t) and its voltage is V(t). So Q(t) = C(t)V(t) and I = dQ/dt = C(t)*dV/dt + V(t)*dc/dt.
My question: SO for variable capacitor, Impedance(Zc = 1/cjw) cannot be defined. Is it correct? since its differential equations is...
Thanks for your reply, I send UDP packets (data is a counter, it means each byte is one greater than the previous one) to FPGA2 by FPGA1 and in FPGA2, I subtract the new byte from the old one and in a case the value is not 1 it shows an error so the error-counter will be increase by one and I...
Hi,
Actually I used a "10 Gigabit Ethernet Subsystem v3.1 IP core" and kintex7/Ultrascale FPGAs to run SFP and it would seem that everything runs ok. But I have a problem. Whenever connect a SFP cable between two FPGA-based boards they send and receive data without any error but when I connect...
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