# Questions tagged [sinusoidal]

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### Oscilloscope Low Sampling at uHz Sinus Signal

I tried to measure a sinus signal at 1000 µHz with my R&S RTC1000 oscilloscope (bandwith 300 MHz). The function generator that I used was the EDU33212A. I set the T/div=100s and the oscilloscope ...
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### Finding the natural frequency from the transfer function magnitude

Studying Steady Sinusoidal State circuits and I have a question regarding RLC circuit. Given that the transfer function for the voltage across the capacitor is given by -  H(j\omega) = \frac{1}{R+j\...
206 views

### Graph plot of sinusoidal current/voltage vs displacement of speaker membrane from its resting position

For a very long time I believed that the speaker membrane just moves according to the amplitude of a electrical signal fed to it. Like, If at any instant, the current/voltage is at c% (0 <= c <= ...
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### Is it possible to write a sinusoidal steady state response of a RC circuit with diode involved?

Let's consider this circuit. When everything is ideal and the forward voltage of the diode is 0. When the current is going forward, the time constant is R1*C. When reversed, it is (R1//R2)*C. Is it ...
1 vote
43 views

### Diode directed into the negative terminal of a sinusoidal voltage source

If my V_in is a sinusoidal voltage, what would be the V_out? I tried to plot this in ltspice, however, I ran into trouble on where to connect the ground, on what node should I use to extract V_in and ...
95 views

### What is the negative omega squared in this function?

I'm trying to draw a Bode plot for the transfer function, but I am confused on what the negative omega squared is supposed to be. Is it supposed to be the frequency with no phase angle? How can I get ...
89 views

### Why do resistances disappear when studying variations of the voltage Va?

I'm trying to solve the question 2.2 of this sensor conditioning exercise. In the solution of the exercise, when trying to find Δ va, the teacher made the resistors R, and the continuous voltage ...
93 views

### When can we apply phasor analysis to an $RLC$ circuit?

This answer of mine shows that not every $RLC$ circuit reaches sinusoidal steady state at input frequency. A well-known theorem states that: If all natural frequencies of a uniquely solvable LTI ...
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1 vote
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### Why is there a DC component in the output spectrum from an op-amp adder?

I'm experimenting with a DSB-SC circuit using TINA simulation tool. As input I'm using two sinusoids with frequencies of 500 and 1000 Hz, i.e. 0.05sin(2π500t) and 0.1sin(2π1000t) which are guided into ...
116 views

### Sinusoid Amplitude for an Ultrasonic Transducer

I want to design a driver for PKT40A from ThorLabs. The spec sheet indicates "Power (Typical, Instantaneous @ 3 kV)" of 700W, but the "Impedance at Resonant Frequency" of <12 ...
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### How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid ...
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3k views

### Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to ...
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