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any thing else can cause this buzz ? An old and 'unprofessional' technique, but occasionally very effective in determining the cause of audible noise emitted in the power supply, is to put your finger on some board components and assess whether it has overshadowed a bit loudness. Needless to mention that this must b
I have made a simple transmission gate with one input (for signal with sinusiodal voltage input V0), a control (logic 0/1 to make switch On /OFF, with dc voltgae) and an output across a resistor. I want to do the noise analysis of this circuit. 1) Since it is not a differential circuit, how can i have positive and negative output nodes, for outpu
switch off means floating signal, unless the node is pulled down by some means. Any reason why not to expect arbitrary signals on the floating node? Jumping into details, we would ask for the type of observed signal (DC, noise, known interfering source)
R9 noise is shorted by U2 when the switch is closed -> noise contribution irrelevant.
Hello! I'm planning to use a circuit attached (from 'The Art of Electronics 3rd Edition') to measure the noise of some fast low noise npn I got. 126151 But it is not really well described in the book. I don't get the use of the "pre-insertion" and R4. Also I don't understand the use of the small resistors R2 and R3
Hi I have to measure noise figure in a circuit that I have attached its picture. Also I should check the isolation between 1. antenna ports and and LNA. I'm not familiar with ADS. I would appreciate if somebody help me with these two cases. Thanks in advance Parisa 124874
How much current does it takes to charge your battery? does your diode takes that into consideration? maybe you just need a bigger diode... anyway, I don't think you should have any problem using a relay, maybe add a snubber and a hysteresis/voltage level driver to minimize switching noise...
It sounds as though the device is plagued by false triggers. This shows a common method to stabilize a sensitive input. (Of course it is only supposition on my part that this could be your My above post is
Which connector switch Sleeve? You are wondering why DC ground current causes ground noise? with 50mOhm spec @1A or after aging? or with low level signal or with inductive grounds and unshielded connector and signals? Pls show your problem with photo of layout and scope trace. ( assuming 2.5 or 3.5 mm stereo with Gnd switch )1
I've been designing boards for a system that inherently generates A LOT of EMI (very high pulsed power application). We always have issues with noise coupling onto our small signals, so on the boards I've been designing I have been putting copper pours on the top and bottom layers after all the routing is finished and connecting those pours to the
Hi there I have several questions when I use the the PSS+pnoise to simulate the noise of the SC circuits as follows: 119004 119005 1) Ron is the Equivalent resistance of the switch,the noise of Fig.1 does not change with with Ron,but the noise of Fig.2 has relationship with Ro
Flicker noise is infinite at DC. Speaking properly, what tends to infinity in the flicker noise model is its power spectral density. If I pass flicker noise through an on/off switch with switching frequency w, what the output spectrum would be? Would the spectrum be infinite at w, 3*w, 5*w?etc? It doe
Hai , i was making an A/V selector switch that will be controlled my microcontroller. I will be using SPDT relays each for Video, left ,and right. The NO and NC contact of relay will go to 2 different sources. So my question is will this configuration give out any sort of noise (because inside the relay the contacts might be
Don't use ceramic caps, they have a memory effect. Use a small film cap for the S&H cap. You can work out the RpC leakage rate for sag and RsC capture rate for sample and choose values according to speeds, noise and rates required. Analog CMOS MUX switches are preferred with low glitch feedthru
It is not a good idea to test the switch mode power supplies on bread board, unless you are expert in power electronics. High frequency switching currents creates lot of noise and spikes in ground. PCB with good layout is recommended.
Microprofessor, ha, ha, that is a good joke.:lol: A switch contacts bounce when the pushbutton is activated which results in many pulses fed to the digital input that counts all of them. The capacitor is normally charged and is discharged very quickly on the first contacts closure and during the bounces its slow charging by the 10k resistor
Hello. I have a switch which pulls down (to ground) a pin of a PIC18F65K22 Micro to give a logic low. If the switch is open then the pin is pulled up to the 5V rail via a 47K resistor. Do you think I need a 10n (or thereabouts) capacitor connected to the pin to reduce noise at the pin? When pulled high, and without such a capacitor, do (...)
I would not recommend the usage of a 555 IC, because to charge a capacitor in exactly 1 hour is almost impossible because of temperature, component tolerances and ambient noise. I recommend the usage of a 'high' frequency clock and then to divide it. Another option is to use a MCU.
I see contradicting aspects that could reason the assignment to one or the other supply node. - bus operation causes noise injection to the supply - power supply noise shows a certain feedthrough to analog switch nodes Unless the analog circuit connected to the switch involves ultra low signal levels, digital supply (...)
could you be overloading the power supply or getting noise on the power lines when the motors switch on?

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