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Questions tagged [ringing]

Anything related to ringing, i.e. a phenomenon arising in some circuits when the output signal exhibit damped oscillations superimposed to its steady-state response when reacting to an abrupt variation (e.g. a step) of its input signal.

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High voltage pulse discharge ring dampening (how to save a pulse capacitor)

So I have a high voltage pulse circuit. I have planned it to be around 90kv with the capacitor being 1.3uF. It is to be discharged through a spark gap. Before I test it, I of course want to save the ...
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44 views

Maximum ringing due to inductive coupling

Consider a bundle of wires carrying binary data and the worst case (or almost-worst case) scenario of them switching all at the same time. The wires with their partial mutual inductances would be ...
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50 views

Distributed LC vs Distributed RC

The usual rule with LC circuits is to use the lumped model if the circuit is considerably smaller than the wavelength, or if the propagation time is considerably smaller than the rise time. With RC ...
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78 views

What causes random ringing in my inverter?

I'm currently redesigning the inverter for driving my induction heater. While I've sorted out most problems I encountered I'm still struggling with the actual inverter. Picture 1 shows the waveform ...
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1answer
111 views

Overshoots and ringing…Do I need to compensate my probes or is it bad line termination?

When working with my DSO (Rigol DS2072A) I recently observed that signals have overshoots and showed some ringing as in the image below (it's a 2 MHz digital signal, SPI from a µC). I use the 10:1 ...
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46 views

Ringing at mosfet source just before turning on

I am working on buck converter but stuck on at the basic results. I simulated my circuit in OrCad. Attaching my circuit diagram and waveforms. The problem is with the voltage at source of mosfet....
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1answer
442 views

Why does turning a MOSFET ON too fast cause ringing?

Going though app notes, I can understand that turning it off (i.e. when drain-source voltage is increasing) can cause ringing due to parasitic NPN and also drain-gate capacitor which can charge the ...
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201 views

damping ringing in stepper motor phase current

I am modifying a stepper motor control circuit that uses Allegro A3959SLB PWM motor drivers. The purpose of the modification is to drive a more robust stepper at its rated 2A rms current, driven by a ...
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1answer
113 views

Why is my RF switch catching on fire?

The pictured circuit below works nicely as a electronically switchable-gain photodiode amplifier. Except for the small issue that as it is being plugged in, U2, a fast CMOS RF switch, has a ...
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1answer
153 views

AD4610 - Is it possible to eleminate this single overshoot

I am trying to compensate input capacitance of the AD4610. It does not matter if it is actually over- or undershooting - there is always a spike: I do not have this problem with the OPA4141 for ...
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1answer
267 views

Twin-T filter decay rate (drum circuit)

I'm building a Twin-T active bandpass filter as shown on this schematic: simulate this circuit – Schematic created using CircuitLab My aim is to build a simple drum-like synthesizer that ...
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1answer
110 views

Ringing NOT at crossover frequency

Assume I have a system with open-loop gain G = (s+1)^2/s^3. This system has a negative feedback with feedback factor 1. I plot the open-loop gain by Bode and see that the phase margin Pm = 21.3877 at ...
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2answers
849 views

Gate and Drain ringing on a highside MOSFET Driver

I have designed a high side driven buck-boost converter. When proceeding with the wave forms, I'm getting a considerable amount of ringing in both drain and gate (kindly see the attachments). To ...
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2answers
473 views

Ringing in MOSFET H bridge when connected load through LC filter

I'm currently making a pure sine inverter using a MOSFET H bridge with following specs. Vin=360VDC Vout=230VAC at 50Hz Output Power=750W Switching frequency=16kHz I use Sine modulated PWM(SPWM) ...
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3answers
519 views

Function Generator, BNC T and Termination

I have a question regarding best practices for function generator to circuit/scope connection. I recently had an issue chasing down excessive ringing on square wave signals coming from a function ...
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1answer
188 views

High freq OP-AMP voltage follower is ringing and is unstable

I try to design analog buffer for the 5MSPS STM32 ADC. I try to use TSH114IDT or CLC4007 opamps ( I need 8 in total). I have done so far: Tried the design below with or without some of the elements - ...
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3answers
241 views

Fast analog switch overshoot

The circuit purpose is to control square signal frequency from 100Hz to 1kHz (generated by MCU GPIO) and be able to control amplitude from 100mV to 2.3V. It is like a very simple signal generator. The ...
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1answer
707 views

Ringing/Noise on smps output while BJT turns on

I am trying to build a 4watt SMPS with 5v output.The design uses BJT switching in quasi-resonant mode. Though I could get the 5V output, I am observing ringing in the output which is increasing the ...
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2answers
345 views

Op-Amp output not stabilizing in precision current sink

I am creating a precision 3A current sink which functions when connected to 12+ volts. I am using the following circuit: The voltage reference is created by a 0.4V precision reference chip (LT6650CS5)...
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1answer
124 views

Fly-back dc/dc converter connect to external ground

I am making a PoE design with a silvertel AG5200. This design has two inputs, PoE and a 'aux' power input. The AG5200 is a flyback and is isolated from the ethernet, so it has a isolated ground. ...
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2answers
821 views

How to avoid ringing in the attached power mosfet switching circuit?

I have made a PWM controlled Power Mosfet switching circuit as attached. I am switching @ 100 kHz with rise time of ~15ns (my system reuires high speed switching. Hence I have kept gate drive ...
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27 views

Explanation for different Noise Signatures on Series Terminated Clock Line [duplicate]

In the picture below (taken from this youtube video), it is explained what the clock signal would look like depending upon the value of Driver and Series Resistance value compared to the transmission ...
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2answers
65 views

Typical flyback conductive noise emission simulaton

I'm trying to understand what is a typical conductive noise emission of a flyback converter. I made a simplified model (I skip the transformer replaced with a single coil - I think that this ...
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1answer
544 views

Questions and confusions on transmission line theory and lumped element model

I want to model a simple signal transmission system by considering it as travelling through a transmission line. Here is the system: The original signal generated by the transducer is 0 to 10V step ...
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2answers
836 views

A question about ringing phenomena and resonance

Below is an LC circuit fed by a 1V 10kHz square-wave. As you see the output is a sinusoid, which would be max. if it were produced by an input at resonance frequency. And here below the same circuit'...
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1answer
406 views

A question on eliminating ringing on a pulse

Above is a circuit with L C R components to model ringing. As you see a 1V 50Hz pulse is applied to the circuit. The ringing can be seen at the output pulse in blue color which has the resonance ...
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3answers
253 views

How is my square wave circuit able to turn itself on?

I built a small 1-to-1 transformer from a ferrite core, to investigate if it could be used as a MOSFET gate drive transformer. I use speaker wire, it has two insulated conductors. I am driving the ...
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3answers
1k views

Snubbing DCM (nonsynchronous) Buck converter

FINAL UPDATE: I've posted an outcome report below. I'm very satisfied with how this has come out and I learned a lot in the process. More details and before/after shots in the answer below. Thanks to ...
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1answer
491 views

I2C PCA9600 logic side offset + ringing

I am using an NXP PCA9600 I2C bus buffer to drive a 2 meter cable in a two wire configuration. My clock is 100KHz. The bus voltage is 5V and the device sides are 3.3V. I have 350 ohm pull-ups on the ...
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2answers
1k views

I need some help understanding overshoot and ringing in MOSFET half bridges

From FDA75N28 datasheet: What I am having difficulty understanding are the reasons behind overshoot and ringing in V_DS. Now, to what I already know: The current that passes in an inductor cannot ...
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2answers
844 views

Ripple and Ringing from Cheap Chinese Boost Converter

I'm using a cheap chinese XL6009 adjustable converter module to boost 5 V to 12 V. To test this converter, I used a 5 V supply, a 120 Ω ohm load to draw 100 mA current (100 mA at 12 V is the ...
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1answer
722 views

Ringing in OPamp OutPut

I am using this Differential In/Out Opamp circuit as ADC driver and to provide some gain(G=6.4). The component values are R53,R52=100, C28, C27=1.1uF, R56= 1K, R57=open, R55,R54= 2K7, U6=OPA2211. At ...
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1answer
232 views

Why does smaller step show instability better?

I was stability testing a simple op amp circuit by applying a square wave to the input and looking for ringing etc. on the transitions. I figured, hey, I'll give it a big whack, say from 0 to 5V, ...
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1answer
116 views

What is causing this level shift in my wave?

Excuse the quality, sorry; RED is GATE of Q2. YELLOW is GATE of Q4. 5V INPUT AT ALL STAGES What are possible reasons that my H-bridge has a little 'bump' at the turn-off of the high-side? It's ...
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2answers
240 views

What circuit can use a falling edge to trigger this damped oscillating impulse waveform?

What circuit can generate the waveform shown below upon receiving a falling edge trigger? The closest I've gotten is that it looks like an RLC that got charged then the loop got closed. I'm guessing ...
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1answer
80 views

Passive ringing on PCB causing noise

I have a PCB that is exposed to a sharp inductive-voltage collapse, around 100V/100nsec. The voltage collapse happens when the current through a transorb reaches zero. When this happens, the board and ...
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2answers
3k views

Causes of ringing in a PCB

Im trying to understand the source of ringing at the termination point of a PCB traces before i delve into actually designing a PCB. For example, by 'termination point', I mean a clock signal ...
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2answers
2k views

how to parallel mosfet

i want to build induction furnace i parallel 16 power mosfet(irfp460) 8 fet for high side and 8 fet for low side for half bridge i use ir2104s and bd139 and bd140 totem pole for drive mosfet. like ...
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2answers
2k views

Taking the edge/ring off a clock signal with an RC circuit?

I'm designing a board for a hobby project where I am using a lattice machxo2 cpld as a system interconnect. The cpld needs to be clocked at 80-100MHz, and because I sprung for a cheaper cpld, it has ...
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1answer
2k views

push pull drain severe ringing

Background: I am trying to make a push pull dc-dc converter from 12vdc to 400vdc for an inverter with a center tapped transformer connected to battery of 12vdc. The MOSFET circuit is as follows As ...
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2answers
345 views

How to make an easy oscillator?

I want to make a very simple oscillator that produces the sound of telephone ringing (I want to make a ringer). I will not connect it to a telephone so the quality of the sound is not important. I ...
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4answers
10k views

Severe ringing when high side MOSFET in half bridge circuit switches on

I have designed a PCB (intended as a prototyping building block) that has a IR2113 high and low side gate driver driving two IRF3205 (55V, 8mΩ, 110A) power MOSFETs in half-bridge configuration: ...
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2answers
5k views

Theory behind the “Joule Ringer” circuit

The less-than-critical thinking free energy types are pointing to the "Super Joule Ringer" demonstrations online, where a quick touch with a 9 V battery illuminates an LED for hours. http://...
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2answers
892 views

MOSFET Gate Series Resistance Guidlines

I am trying to choose a series resistor for a MOSFET (PSMN1R5-25YL) in order to reduce ringing, and I wish to know the guidelines for choosing the right resistance. I'm not sure if it's relevant, but ...
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2answers
3k views

SMPS, output ringing?

I built an SMPS (see here for details), and so far it's been working good. But I noticed a strange oscillation (or ringing?) at the output. Here's what it looks like, with a 4 amps load: Now, you'...
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1answer
705 views

Ground noise measured on scope

I've connected a scope probe directly to the ground clip of the scope. I then observe the signal on the scope and it's reading 0, as expected. I set my trigger to be 1V above the 0V reading it ...
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3answers
2k views

Ultrasound receiver ringing suppression

How can I limit the ringing time and amplitude of an ultrasonic receiver that has just been hit by an incoming wave? [Note - just adding a resistor in parallel does not work well]. Any known ...
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3answers
8k views

Minimizing Ringing in a H-Bridge

I am designing a H-Bridge based DC-DC Converter that boosts 24V to 350V DC. I use a HF transformer at the output of the H-Bridge for the actual boost. The circuit works OK for a while and then the IC ...
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5answers
23k views

What can reduce overshoot and ringing on a simple square wave pulse generator?

I've built a simple RC and Schmitt-trigger-based square wave pulse generator. On the breadboard, it has some obvious unwanted qualities due to jumper length, the breadboard itself, etc. Schematic and ...
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2answers
12k views

What is killing my MOSFETs

This is my first post here on electronics stackexchange. I am a hobbyits in electronics, and a professional in programming. I am working on a inductor circuit to heat a workpiece. I have a working ...