# Questions tagged [non-linear]

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### Using a non-time domain equation for a nonlinear equation based device in QUCS

I'm trying to model a magnetron oscillator source in QUCS. I am only interested in the output of the magnetron, not how it is powered. Traditionally a magnetron is modeled the same as many oscillators,...
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### How is constant on time control better than voltage mode control for transient response?

I am trying to understand the benefits of constant on time control (COT) over voltage or current mode control. In voltage mode control, during a load transient (increase in load) an aggressive control ...
113 views

### Simple examples of higher order circuits and the cause of non linearity

In my previous question, I learned that resistance, capacitance, and inductance are not enough to capture the behavior of all circuits. This led me to the question, what are some examples of 'simple' ...
57 views

### Ian Fritz - Chaos - Cubic non linearity

I was reading Ian Fritz overview on chaotic circuits. As an example of non-linear circuit, he presents the following schematics This circuit is said to output a signal of the form x.(1-x^2) where x ...
37 views

### What's wrong with my experiment to observe harmonics caused by receiver saturation and non-linear behavior?

I've been trying to devise an experiment to produce a third order harmonic in radio receiver that's been saturated, but I'm not seeing the expected results. My understanding of the theory is that when ...
112 views

### How do I simulate an RF mixer in PSS or harmomic balance with an autonomous local oscillator?

I am designing a CMOS RF downconversion signal chain comprised of a local oscillator and mixer (the LNA is not yet included) using the Cadence Virtuoso Circuit Design Suite with ADE XL as my simulator....
204 views

### Transient buildup of capacitively coupled transistor amplifier

I'm trying to understand the following section from "Communication Circuits: Analysis and Design" by Donald T. Hess: Here $W(t)$ is defined by W(t) = e^{\frac{q(v_i(t) - v_{imax})}{kT}}...
91 views

### How to even start solving multi-diode problems?

For example, in the circuit below there are 5 diodes constant-voltage-drop diodes, I could have 2^5 circuits to solve. Is there something I'm not paying attention to, that would greatly simplify this ...
189 views

### Determine the output voltage

I'm trying to solve the following question: Determine the output-tuned circuit voltage in Fig. 4.P-7. The tuned circuit is resonant at $\omega_0$ and has $Q_T = 20$. My try: I don't know how to ...
66 views

630 views

### Non-linear Inductor LTSpice

I am trying to implement a non-linear inductor in LTSpice and to get it to saturate. I am using the following directive between N1 and N2 as advised in the help files: L1 N1 N2 Hc=12 Br=0.2 Bs=0.4 A=...
459 views

### How to make a non-linear potmeter more linear

I have an "Expression pedal" that worked fine on my old keyboard (Gem WX2+) but works almost like a digital switch on my new keyboard (Roland VR-09). The recommended expression pedal is a Roland EV-5 ...
48 views

### Normalizing a nonlinear plant in system identification in control

I have calculated the "active power" and the "the reactive" power of a system in dq axis in nonlinear form and I am doing system identification on this "nonlinear" plant as a MIMO system. The problem ...
172 views

### Performing small signal ac analysis with non-linear components

I have written a circuit simulator that uses Kirchoff's voltage and current laws to solve linear circuits containing capacitors, resistors, inductors and op-amps (where the op-amps are assumed to be ...
206 views

### Bandwidth and stability of nonlinear circuit

I'm designing an antilog amplifier which produces an exponential output (0.4 mV to 4 V) for a 50 Hz sawtooth input waveform (4 mV to 4 V ramp). If this were a linear circuit, I could determine the ...
306 views

### Transfer function_Approximation of second order system for a linear actuator

I am trying to approximate a transfer function of a system. The system is a linear actuator, connected to a feedback potentiometer. The actuator has a mass on it. The following figure is a step ...
252 views

### How to plot response of a non-linear state space model in Simulink?

I am trying to plot a non-linear model in order to compare it with it's linearized counterpart. I am following this paper Nonlinear Model & Controller Design for Magnetic Levitation System and ...
106 views

### 2 tone test with RF mixer

I am designing a system that uses RF to probe the nonlinearity of a target. It works as follows. Transmitter sends out 2 RF frequencies, such as 900 and 910MHz. The target/reflector has a ...