Search Engine

1000 Threads found on Noise Canceling
Using high frequent PWM (quasi continuous variation of the 50 Hz voltage) eliminates 50 Hz harmonics but adds pwm frequent (fundamental + harmonics) interferences. Looking at the unfiltered modulated voltage and current, the noise power is increased, not reduced. Consider that the permitted noise level for 150 kHz to 30 MHz conducted interferenc
Hello everyone, I am currently designing two low noise amplifiers (which will respectively operate at ~20GHz and ~38GHz) with the same foundry process (D007iH from OMMIC). The transistors come as discrete chips (roughly 400x400x100 um) without via holes, the aim is to use inductive degeneration and connect the source pads to ground thanks to two
Hello I was scoping the Primary , Post rectifier DC Bus in a 100W, 240VAC, offline PFC?d Flyback to see what the voltage ripple was like on this rail. As you can see, at the mains peak, there is a lot of noise at the peak of the waveform that makes the measurement impossible. The blue waveforms were done with a x10 scope probe (with a dangli
Using the kT/C noise to calculate the unit cap is a reasonable approach. MOM caps usually used in the design of the cap dac for SARs match pretty well, maybe up to 10 bit accuracy and they keep their matching for many years. For 12 bit dac you may need to think of some sort of calibration for the first 2-3 MSB caps. Or use redundancy in the dac whi
You can do PSS+Pnoise Analysis but the accuracy won't be so good.Because the most difficult part of a modelization is to predict Low Frequency noise components.
If you combine two identical signal, perfectly in phase they amplitude will double while the noise (uncorrelated) will sum in power. Theoretically you can gain 3 dB NF. In practice you will have a lower gain since the two waveform will not be perfectly identical in phase and amplitude and also the combiner will have imperfections and losses.
Hello all, I will have to create my own stable reference ~1.45 - 1.6 GHz and move away from using a bench-top synthesizer. What are some of the common methods to create such a stable "tune-able" reference? Is this something a DDS or good DAC can accomplish? Or would it have to be more hardware based (like a crystal) to maint
Is there a way to calculate the input referred noise of a circuit that contains static sub circuit followed by a dynamic sub circuit??It is possible, if you can define gain. Can you define gain ?
the timing of the output data rising edge of a flip flop will vary depending on circuit noise, so was wondering how to characterize this noise..Use Shooting-Newton-PSS/Tdnoise in Cadence Spectre. .
This circuit detects nothing but noise.. You do very serious fundamental mistakes
I am reading couple of books on calculating the values of VIL, VOL, VOH, VIH for basic NMOS inverter. I notice there are 2 methods to calculate these values. One is an approximate method: where it is assumed that VOL is basically equal to Vmin that a given circuit can achieve and set VOH to Vmax. Second method is standard method: to get the -
In general, I would care about long line resistance, RC delay, capacitive coupling (accepting or introducing noise from/to other nets). For current paths - IR drop (because of high resistance). For voltage paths - capacitive coupling, introducing noise. For extraction and post-layout analysis - do not forget to tell the extraction tool to fractu
I believe that the manufacturer has assumed the IC will be used with 50 Ohm source impedance that's why a single inductor completes the matching for Lowest noise.
F(total) = F1 + (F2 ? 1)/G1 where: F(total) = Total noise factor F = noise factor of each stage noise Figure (dB) = 10*LOG(F) G = Gain of each stage (linear not in dB) From the two stage amplifier example below we can see that the first amplifier in the chain has the most contribution on the total noise figure. For (...)
There are many good quality electret microphones stocked at Digikey. The first one listed costs $.77US and its datasheet shows its fairly wide frequency response and its low noise level. It does not list its distortion but I expect it to be very low.
Use time domain noise analysis of PSS/Pnoise. Then integrate noise spectrum over 0-fs/2. Here you have to set a decision time.
"I tried two circuits to get low signal to trigger 555 timer . I tried circuit 2 with 10k for R1 and R2 and i faced a problem . *the led of pc817 always on an this tell the controller the button always pressed." OF Course!! R1 and R2 will draw a current, and that current will flow thru the optocoupler because it is IN SERIES with the div
RS-422 should have high noise immunity already. If you can build yourself, UART->Opto->ADM488 or ADM489 would work and be simple. Keep the opto on the UART side where there is only one data line. Brian.
How do you calculate the noise of that comparator?
156045 Differential amplifiers offer many advantages for manipulating differential signals. They provide immunity to external noise; 6-dB increase in dynamic range, which is a clear advantage for low-voltage systems; and reduce the second level harmonics. The fully integrated differential differential amplifier is suitable