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vary the input frequency and calculate output voltage and plot graph between frequency and voltage ratio in db and find 3db bandwidth
For a nonlinear Class E Power Amplifier, if I want to check its 3db bandwidth, do I just do a parametric sweep analysis of frequency of the input signal and see the frequency vs power gain plot?Use PSS Analysis with sweeping fundamental frequency which is a frequency of driving signal.
Hi, I want to design an amplifier with a 40MHz -3db bandwidth and 46dB DC gain but low noise for special use. But in this design the gain bandwidth product will be 8g. It is very large. Can this design come true, please? Or should I use several independence amplifier with 40MHz -3db bandwidth but quite (...)
Hi, This is a basic diff amp with a tail current of Iss, two NMOS input devices with load resistors Rd on both drains. The diff output is tapped off the drains of the two NMOS devices at the node that connects the drain to Rd. The only thing that makes it a little different from a standard resistive load Differential amplifier is that both l
Can someone please help me in calculating the 3db bandwidth of this diff amp ? I am attaching the schematic. Thanks
for a closed-loop opamp, if the dominant pole is complex, such as -a+b*i, then how to understand and calculate the -3db bandwidth of the opamp? if an opamp has a complex pole or zero, then what is the meaning of it? besides, as we know, GBW(open)=GBW(closed),then what is the relationship of p2(the second pole) for open and closed loop? fin
How can I calculate the 3db bandwidth of a signal from its equation. For instance, x(f) = e^(2*pi*f*j) ?
For a second order system with the transfer function: T=1/(s?+sω/Q+ω?), how can I get the conclusion that when Q?5, the 3db bandwidth is approximately ω/Q? Can anybody give me some hints on making this derivation?
maxwellequ and Kevin, the thing is you're BOTH mostly right! You're just speaking different languages. maxwellequ seems to be sticking to the continuous analog terminology, while Kevin, it seems to me, mixes the analog theory with digital terminology commonly used in the discrete, digital realm, that is, the use of discrete trigonometric calculus
hi there I have a very basic question..Why do we always consider 3 db bandwidth of the signal and not 2 db or 1 db ... hope to get a reply thanks
Hi, How do I measure the -3db bandwidth of an antenna in HFSS? Is it by plotting the S11 and obtain the bandwidth from there? If yes, do I measure the bandwidth with reference to the -3db point on the S11 curve? Or is it some other reference point? Also, in real-life measurements, how (...)
This has been puzzled me for a while. There's no such thing like a "3db BW" in HFSS. I understand you may watch the s11 curve and measure the portion higher than -10 dB for the bandwidth. But how can you optimize it? Is there a way to write an express in "output variable" to calculate the 3db BW automatically? Thanks Add
If you have the specs of a comercial opamp look at the plot gain versus frequency and check the gain 3db below the DC gain. Now, if you're simulating your opamp just perform an AC analysis and plot gain versus frequency and measure the gain in the same way.
I design a Transimpedence Amp in 0.25 with 73dbohm(4200ohm) gain and 1G bandwidth with input and output cap 2pF. The 3db bandwidth is about 1G in magnitude,but when Frequence more than 500M, phase become 180(inverse).Can I say the bandwidth of the Amp is more than 1G? And How to revise it.Thanks. (...)
your plotting the Nyquist bandwidth, they are not different. The 3db bandwidth is the full range of frequencies over which the signal is present 3db below the max. When you plot depending on how you plot, the plot can soemtiems extend towards negative (...)
How do we improve SR? What is the 3db BW of voltage follower? thanks.
hi guys, I want to simulate the difference of signal bandwidth with different pulse shapping. I use two kinds of pulse shaping: 1) rect shaping 2) half-sine shaping. I whish to find out half-sine shaping gets good bantwidth efficiency.... I have created specturm diagram, but I dont know how to find out the bandwidth..(3db (...)
Hi Guys, I have a question here. Currently I'm desiging a Differential Transimpedance Amplifier for 10Gbps in CMOS. Basically it is a 2 stage amplifier followed by a 50ohm buffer. Now my question is when i measure the 3db bandwidth of the TIA, should i consider the 50ohm buffer in the bandwidth calculation or just include the last stage (...)
Hum remember what is the Laplace transforme of capacitor is something as 1/Cs with s=jw Now if you use a logarithmique scale (as Bode plot) what do you get ? -20 Log(w)-20Log(C) (So a draw in a X logarithmique scale).Nevertheless you need to polarize your PMOS Capacitor before to perform this AC simulation. I hope it will help you on probl
I want to know how to measure fully differential amp's spec, I used LMH6550, National semiconductor macro spice model. I thought I can know How to measure Fully differential opamp' spec if I compare simulation result with LMH6550 datasheet after simulating LMH6550 macro model. In the LMH6550 datasheet, there is some spec like "small s
How to design a Video driver with power of 9V. The bandwidth is 75MHz, using CMOS technology. Any recommanded books to read?
what is the exact reasone for such high bandwidths in CFAs.Although i know that BW is independent of gain in CFAs but that to me seem to be a good way to justify high BW using mathematical analysis.......can somebody explain what are the physical or functional reasons which cause such high BW in CFAs???????
I would make a simple lumped element resonator as follows: At port 1, a series coupling capacitor Cc. In the middle three elements in parallel to ground, L,C,R From the middle to port 2, another coupling capacitor Cc. The circuit will resonate at approximately the frequency f0=1/(2Π√LC). Why not exactly that frequency
Hi, all I want do design a 3db bandwidth of 10MHz 3 order butterworth filter, what about the OP bandwidth of this design, 10MHz, 20MHz, 30MHz, 40MHz or any others? thanks
Hi, dear all. Are there anyone familiar with the wavescan calculator of cadence? It seemed to be totally wrong. I use it to measure the 3db bandwidth, whether it is low, high or band, the results go far from the right values. Are there any settings that I should be careful of? Or is it just a wrong function? And, how do you calculate the bandw
Pls.... answer me the given below Ques... expecting an approximate
I measured some parallel connected LC tanks and get one-port S parameters with 50 Ohm port impedance. I want to extract Q value of LC tanks, but I think the one-port S-params I get is loaded S parameters. From the measurement data, the |Z11| is approximately 50Ohm(equals port impedance) and the 20log|S21| is not sharp. Is there any ways to get
Hi Guys, I have question here. I have designed a transimpedance amplifier (TIA) which works at 1.25Gbps. I have run the AC simulation at the package level (wire-bonding model). Attached are the 2 plots of the gain fucntion. Bode1 is the gain function with the multiple ground pin and Bode2 is the gain function with single ground pin. If we look a
Hi, 1.What is the relation between Sampling Frequency and bandwidth when you are using a Scope? 2.What is the maximum frequency you can measure on a 200 Mhz Oscilloscope? TIA., Regards Deepak
I have designed a MIXER in cadence. I have measured all required parameter but unable to decide frequency range of my mixer. can any one suggest me how to determine frequency range of mixer?(in cadence) vivek
hi everyone i want to know the relation between the coupling cofficient and coupling bandwidth in a combline or interdigital filter plz help thank you
1, When designing PLL, it is always said that PLL's bandwidth should be set to be smaller than Fref/10. what's the PLL bandwidth? Is it Wc(open loop unit gain bandwidth), Wn( Natural frequency) or W-3db ( closed loop -3db frequency)? 2, and I know Wc means the frequency where gain=1. (...)
That means, it is applicable only to sinusoidal signal. And to measure the FPBW, do I need to connect the opamp in unity-gain mode? Yes, of course, since all bandwidth and distortion related parameters are referenced to sinusoidal signals. In theory, negative feedback has not much influence on the full-power BW (FPBW). Because of non-li
Hi all, I am kind of confused when people talk about the PLL bandwidth. Lets say the PLL loop filter is 1/(1+s/Wp). 1. When people say the bandwidth has to be less than 1/10 of Fref, which bandwidth are we referring to? a. loop filter 3db bandwidth? b. loop filter unity gain (...)
i guess what the stb simulation does is for the loop-gain, which will include the feedback factor. so the amplitude response in the bode plot will actually move up or down according the feedback factor, and the unity gain bandwidth changes..
hi all of you, i am using nauta"s transconductor in my filter. Nauta"s transconductor having very less BW . is there any methods to improve band width? regards ram.
Hi I've done Fast Fourier transform of a video sequence using fftn(X,). X is a matrix 3d (x,y,time) I want to calculate along each dimension fixing one at a time, the 3db bandwidth. any idea?
Connect a high L (10H) from output to neg input of opamp and a high C (10F) from neg input to ground. connect a AC source with AC-Mag=1V. add a cap at the output of the opamp to GND( depends on your load, typ 1p F). now run a AC analysis, sweep freq from 1Hz to 10Ghz. plot dB20(Vout_Opamp) and phase(Vout_Opamp) to get gain and phase response (wher
Hi All, I am trying to estimate coupling bandwidth between two resonators using Ansoft HFSS tool. Image attached. 85318 Ripple bandwidth for my design is 80 MHz. I am keeping aperture size between two resonator boxes as variable {aperture width (ApWd)}. plotting S21 for various aperture width values. As we know "
in normal case, comparator is used in open-loop, not in closed-loop as feedback-amplifier, so, how to decide the -3db bandwidth of open-loop comparator? is there some formula or guide for the -3db bandwidth calculation of open-loop comparator? thanks.
Hi, I'm a little confused about the difference between optical bandwidth and electrical bandwidth. The -3db optical bandwidth = -6db electrical bandwidth if i'm correct? for the sake of argument, let say i'm measuring the bandwidth of an LED using a photodiode. the mesurement i'm (...)
hello every one, I am using AD62P49 ADC. In the ADC data sheet I come accross the following statement and I cannot actually understand what it exactly mean here by 3 dB bandwidth and then what does it mean by HIGH 3-dB bandwidth. The input sampling circuit has a high 3-dB bandwidth that extends up to 700 MHz (measured from the in
...And, in addition, is the frequency at which asymptotes cut in Bode plots (cutoff frequency or corner frequency). The term "cutoff" can be a bit misleading for some people, thinking erroneously that something abrupt happens at that frequency. Something rather abrupt happens at the "cutoff frequency" of waveguides, but it's the same term used for
In the following figure, if the two resisters are equal, what is its -3db bandwidth? Compare its stability with that of a source follower. 103365 This is one of my interview question today, still can not figure it out when I am back home. I only know how to solve for non-inverting op amp case.
Hi! I have a question about bandwidths. The circuit I'm using is an analog multiplexer, ADG732BSUZ, and it has a typical "-3db bandwidth of 18MHz" My understanding is that this means that if I have a 18MHz signal of 1V inputed to the switch (ADG732BSUZ) the output will be around 0.5V, is that correct? Now to the question, in the (...)
Anyone has experience in choosing or comparing DAQ PCB card? I need a methodological approach in comparing two analog data acquisition cards. Andybody can help me out? Thanks a lot. Regards, lcg22
standard 0.18 cmos process measurement: gain@dc (S21): 16dB -3db bandwidth: dc to 9GHz S11,S22<-10dB My question is what about the performance of this amplifier compared with those on the same cmos process nowadays.
the smaller the T, the narrower the pulse width. you can plot some curves with different T.
Hi all, I am working in the design a chopper op-amp.but I can't continue for some question: I have designed a two stage amp with 1M bandwidth ,gain is 72dB,PM 61. -3db bandwidth is 250Hz.compensation capacitor is 1.1pF.I have choose the chopper frequency at 100kHz or 100Hz.With the two frequencies ,the chopper modulators can't reduce the (...)