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15 Threads found on Loop Bandwith
ashil_na, I think the 50MHz 3db bandwith is a spec when the opamp is in closed loop configration. Otherwise, things would be really hard just as jimito13 suggested, even in 65nm process. If so, many structures of opamp could be your candidates. As the opamp is for a buffer, a two stage struture with relative high output voltage would be better.
PLL Phase Error RMS = 107 x √ loop_Bw x 10^(Phase_Noise / 20)
With a CFB amplifier, the output to inverting input resistor sets the loop gain, almost independantly of the divider ratio. For maximum bandwith, you should use 620 ohms as suggested in the datasheet. With 2k2, the bandwidth is reduced to about a third.
Hi: What 's the diffrence and relation ship between "nature frequecy", "open-loop bandwidth","open loop bandwidth" and "bandwidth" of PLL ? Best Regards !
As we know,when the phase shift at the open loop pll bandwith is bigger than -180+PM,where PM stands for phase margin and is ususlly >45 degree,we say the pll is stable.I am confused that in a second order pll the phase shift in the frequency near dc is almost -180 degree, but we usually don't care about that. How can it be stable when the freque
does somebody had read Anas A. Hamoui's paper "High-Order Multibit Modulators and Pseudo DWA in Low-Oversampling DS ADCs for Board-Band Applications",ieee trans. on C&S,Jan,2004 in this paper, he claims that the best placement of the compled-conjugate zeros of NTF is about at fbw*^(1/2) fbw: bandwith,L:loop order but i fi
hi friends: Can somebody tell me how to determine the capacitor size for SC-CMFB? does it decrease CM loop bandwith ? thanks in advance
Basically 3db bandwidth tells you at which input frequency the op amp loop gain will be half of it dc gain
frist of all u need to study the PLL as a system well , and check by urself how the LPF will affect the loop , then u should know ur application well , demodulation , FS , and so on , to see if there are any constraints on ur filter bw or not , and then begin ur desgin khouly
Actually , The frantional-N designis the same as general PLL. Just You must care spurious tone that you can accepted . Nornal the loop- bandwith is lower for filter the spurious tone.
What must be the low pass filter's lowest cut off frequency of a current measuring circuit for a 500us current loop? Is 2 KHz enough or is 4KHz needed?
when designing a fully-differential opamp, how to determine the bandwidths of CMFB and the main signal loop? should be the bandwidth of CMFB less than that of signal loop? what range should its bandwidth's ratio be fallen in? thaniks a lot
HI :roll: :idea: Liberal, Your design is not good . If you have frequency which you want and voltage is in possible range (for example with power supply VCC 5V control voltage inside PLL loop is between 0.5-4.5V) PLL loop is not designed good. Check your data for PLL design or wide or limit loop bandwith. GL XTASA
the main component that affect the pll bandwidth is thwe loop filter , when u design the loop filter u must ensure that the bandwidth of the loop is less than the reffernce frequency ur using "linaer approximation validity " about simulation u can simulate thwe pll system using matlab in the phase domain whcih u can get step response (...)
The capture range is determined by the difference between the free-running frequency of the VCO, the input frequency and the bandwith of the loop filter. Simply said this difference has to become small enough so that it can fall within the BW of the low-pass loop filter. That is, you sweep the input frequency from let's say 0Hz toward the (...)