# frequency response

1. ### How do I design a Multistage Amplifier with given specifications, specifically the upper 3dB cutoff frequency?

I have been tasked to design a multistage amplifier with the following specifications: Gain(V/V) = 30, Rin = 20 kohms, Rout < 25 ohms, Power supply = Dual +12V -12V, Max Symmetrical Swing > 9Vpp (peak-to-peak), lower 3dB down point < 200 Hz, Upper 3dB down point > 5 kHz, Rload = 200 ohms. I...
2. ### How to modify/ design error amplifier compensation circuit (with TL431) for variable flyback converter and make it stable.

I bought a power supply adopter (old, used, made for some device) of 24v 4.5A (from 230vac mains). It is a fixed output psu. My intention is to make it a variable psu of 30v to <=5v (as low as possible, and continuously variable). Schematic (simplified) of its error-amp circuitry is attached...
3. ### Controller for infinite phase margin

Hello, I have a transfer function of an active suspension system of a quarter of a vehicle, they ask me to calculate a controller from the Bode diagram that complies with overshoot of 33% and settling time 1. I have the problem that the margin of phase gives infinity, if someone could guide me I...
4. ### Pspice AC analysis of an equivalent mono phase circuit

Hi! I've solved and simulated on PSpice a balanced three phase circuit and now I'm considering the equivalent mono phase circuit. I've already done the transient analysis and I'd like to know if I can run other kind of analysis such as an AC SWEEP/NOISE (to simulate the behaviour of the system...
5. ### How to find the magnitude component at a given frequency with the input-output relationship and input

Hello! We were tasked to find the 100kHz magnitude component of a non linear device with a function $$V_{out}=5V_{in}^{2}$$ where $$V_{in}=cos(1000\cdot 2\pi\cdot t)+sin(1000002\pi\cdot t)$$. So far I have, And now I have no idea where will I find the 100kHz component. Do I turn the...
6. ### Choice of error amplifier for LDO

Hi There! I am, for several reasons about building a adjustable LDO. Some of the specifications are: - min input voltage 4.4V - max output voltage 3.6V - 500mV dropout, due to sense resistor - wide current output range - at least 20kHz bandwidth @ 10uA load, ideally 100kHz Pass element shall...
7. ### Why does mutual Coupling changes self resonant frequency and alters frequency response?

Hello all. I am conducting a simulation based report on resonant inductive coupling. I intend to calculate power transferred as a function of input frequency. For this I used the formulae for self resonant frequency and calculated a SRF of 3.283MHz using 10mH, 235pF and 0.25Ohms as my values...
8. ### Frequency Response of LC Filter has a Peak with an Impedance Load

Hi, I am designing an LC filter with a cut-off frequency of 20 kHz for the Class-D amplifier. The filter schematic is shown in Fig.1 top right. I understand how to choose the LC values for the critically damped case for the pure resistive load as shown in Fig. 2. The problem is I want to drive...