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156 Threads found on Pll Best
I couldn't find the pll software for Roland version 5/6 . Can any one provide a URL to download the software? best
The drawing in post#1 shows a linearized pll model which is applicable under locked condidtions only - and for a "moderate" phase difference between input and output (< 30 deg). Therefore, it is correct that the input and output quantities are PHASE informations in the Laplace domain.
I have been designing pll circuits using VCOs to generate carrier frequencies close to 4GHz. The VCOs come with wide tuning range,but quite bad close-in phase noise. My application demands,best possible phase noise,atleast an improvement of 10 folds over VCO based pll. I looked for options, and found that DRO based carrier (...)
Please recommend me some books on fractional synthesizer design. Don't mention best or Gardner.
Please suggest me best Book for Design a High Performance CMOS pll in SPICE
A charge pumping pll will always have some activity on Vtune because pumped charge is quantized and has some deadband in the phase detector. Drifts on Vtune from leakage etc. will demand an occasional "refresh" in the best case. Question is, is the "ripple" sinusoidal (as ought to come from a classical stability issue) or triangular / trapezoida
I know that I can use an oscillator or perhaps a pll. A pll appears to be a more complex component and I am not sure how I shall use it right now. Anyway, this question is related to Texas Instrument's PCM1808 Audio ADC. It needs a clock input. The table in its data shows the the relationship between sampling rate and the clock input. It says:
Why hasn't anyone answered to this post. I, too, need some good books on pll. I have heard about Gardner's book and Roland best's book but those are either unavailable in my region or are very costly. Please recommend some books on pll.
The dissipation factor or Loss Tangent or complex impedance of water can be done with high voltage if in the GΩ range, but constant current is best method then use pll quadrature detector to measure VI directly or use phase angle vectorfrom a phase detector and measure amplitude of voltage from CC source. . Omega Meters tend to use high vo
in any case output jitter levels will be high. I was about to mention the same thing. Yes you can chain pll's, but before you go too far with this in your project best calculate + verify jitter first. That way you can check your favorite datasheets if it's going to be a problem.
Hello there, it only Internal 4 MHz oscillator . from 6 or 8 MHz use External Crystal.unfortunately there is no build in pll module also.. best regards,
I don't think this is possible except if you use a pll to control the oscillator frequency, (but the pll need a reference frequency provided by a crystal oscillator).
If it were me, I would either do a pll, or use a Hittite X8 HMC444LP4
Hi all, iam finished my pll inCP90nm.After locking my pll the control voltage variation will be 6mV...After adding Decoupling capacitor(Decap=150p) between supply and ground the control voltage variation will be reduced to3.5mV... my questions are 1) How much value of control voltage variation is best? 2) If i need (...)
hi ur frequency after pll never exceed to 40 Mhz. be carefull
What is adjustable pulse width (APW) scheme??..What is its scope in pll... please specify frequency,adjusting methods etc. is it possible a micro controller based design...? best wishes
I have some problem in model the Maneatis' pll,which is called self-biased pll. Anyone have the detail information,could you please E-mail me to Regards !
It is strange for the VCO to get a single freqency with 4.3/4.7V vtune. One case should be unlocked. You can try to tune the Charge pump current register to observe and optimize the phase noise. ADF4157 has best performance when VTUner is btween 0.5V and Vp-0.5V. The Vp should be clean. I second that opinion. Some
Hi I want to design a pll,and i dont know how can i design a first order low pas filter,i cant use matlab functions,and i want to write a filter my self,i would appreciate if anybody can help me.
I want to learn about pll basics and also its IC. I would be really happy if you could provide me some link. Thanks in advance.
Hi all, I need to generate a wideband stepped frequency signal in 2GHz- 4 GHz frequency band with 2 MHz frequency steps for a short range FMCW radar front end. I came across with two devices which is working in the required frequency bands, 1. Linear technology LTC6946 - Ultralow Noise and Spuri
hey guys , iam new to this forum and iam new to xtal osc. too :) would like to ask about the overtone xtals data sheet , i find that it gives the 1value of motional cap for every overtone, however i expected to see 2 different cap values for the 3rd overtone as example, why ? is it possible to suppress the fundamental tone using electrode structu
Hello I have an idea which I would like to discuss with you. I am thinking of a way to produce two accurate 90 degrees out of phase signals, out of a pll, for the radio amateur bands up to 30MHz. I need this, to drive a set of quadrature mixers. I do not want to use a dds since it is hard to solder and program. The range of my pll is 8KHz to 16
Hi all, I have a system that works as an analog pll (PFD, loop filter, CO, N divider) to stabilize the phase variations of a reference. (see attachment) However, there is a significant delay ? 50 microseconds -, due to long distance transmission, in the feedback loop between the VCO and the N divider. Which is the best way to analyze the sta
Ayyanar M , Try to check your cadence results whith a program for calculating the loop parameters (ADSimpll from Analog devices), or Easypll Loop Filter Design Tool from national semiconductor. AlexVD ---------- Post added at 13:04 ---------- Previous post was at 12:28 ---------- Ayyanar M , you can use sim
You intention is far from being clear. Do you want a factor 12.5 frequency division? You can implement it as a /25 division and a frequency doubler. Or as a pll. Or as a digital circuit utilizing both input clock edges.
Why you are asking for an ADpll? A simple "analog" pll chip, e.g. 74HC4046 can perform the 64 to 8192 kHz multiply. The dvided clocks will be available from the frequency divider without additional effort.
Technically speaking, a clipped sine wave output is capable of better phase noise than a cmos or "TTL" output. So if you are buying a very expensive TCXO and trying to make the best pll possible, that would be the way to go. In most cases, though, it will not make a difference. If you are using a modern pll chip, the very first thing (...)
The best way is to use a modern FPGA with a pll, that allows to generate multiple clock signals of programmable phase and duty cycle, e.g. Altera Cyclone III. You also would want to use the fastest available asynchronous SRAMs with e.g. 8 ns cycle time to get some margin for timing variations.
Hello all. This is probably a dumb question, but I need help interpreting this timing diagram and putting the resultant data into a register for additional logic operations. The clock is only valid after load# and cs# go high and low, respectively. What's the best way to ensure I'm sampling the data at its most stable point, given that the c
Is the fundamental frequency constant, within a reletively small range +/- 5% ?. If yes, use a pll to decode the signal for example a NE567 or 74HC4046A. If no, than you have to do much more work and the best way is use a DSP and perform a FFT is possible.
The classical pll text book: Phase Locked Loops 6/e - Roland best - McGraw-Hill Education See also previous discussions about pll books at edaboard.
Hi, I'm am new to design, and had a basic question - for a pll with a set output frequency, e.g. 500 MHz or 1 GHz, to what degree will jitter change as linewidth decreases? or is jitter more related to the frequency? I have looked at a couple specs (0.13 um 90 nm), and it the jitter values seem about the same. Does this seem right? Thank
Hi, I want to design a pll oscillator that it has sine wave out put. To touch this I think,I have to filter output of 4046. Am I right? My operating frequency is 1.1MHz. So I want to design and implement 1.1 and 3.3 MHz oscillators. I want to use pll synthesizer or devider. please help me on these issues. Good Luck.
Hi Have you full finished chips in microwind for ADC or pll?
HI Use timer as counter to generate frequency from the main clock (pll) change the reload value to get higher of lower frequency All the best Bobi The microcontroller specialist
Hi , Could you pl anyone let me know the best method to extract the behavioral model (verilog)for analog components like pll or any analog component . Usually we see for Simulation purpose we hand-code at abstract level . however these models are proven to manual error , and hence live with bug at system level . Pl do let me know the EDA to
Hi Use a timer to divide the pll frequency to the main pixel frequency For instance if your pll locked on 75 MHz you will need to divide by 3 (use the timer to count to 3 ) and the timer interrupt to flip an IO state 1-0-1-0 etc. All the best Bobi The microcontroller specialist
Hi You can also use a microcontroller timer to divide the main micro oscillator to the desired frequency Easy to do with the STM32 16 bit timer - Just lock the pll & set up the timer register Use the mco output for signal All the best Bobi The microcontroller specialist
Hi I think you should use a pll circuit adopted to work on high voltage - this way you can sync PHASE & FREQUENCY Can't help you regarding high voltage usage All the best Bobi
you design the pll or use the lib?
Hi, I am trying to build a circuit to multiply frequencies of between 0.4hz and 4Hz by a 12. Which is best to use for such low frequencies, pll, DDL DDS or Dpll? And apart from pll (which I kind of know what I need to buy) what are the additional components I'll need to buy in addition? Thanks. maame
you can use the pll or dcm. bye. g.
For those of us without the latest gear, we can use a diode detector to measure the amplitude of the rf output; and can use a delay line frequency discriminator (signal splitter, delay line, mixer, manual phase shifter) which can tell you both when the frequency is settled, and when the phase is settled, by watching the mixer IF output on an osci
Hi, i am going to design wb synthesizer (3G~7G). now i am using one loop pll, but the phase noise is not desired.teh desires phase noise is atleast -126dBc/Hz at offset 100KHz. anohther desired parameter is 1ms locktime. would you please help me with the structurethat i can get the desired parameters? and another question, in a pll i can not rea
HI LCD display is a very slow hardware! And the LPC21xx is a very fast device! even if you are not using the pll There for the answer to your question probably lay in the Interface between your LCD and the UC Try to slow down the signal (use longer delay) All the best Bobi The microcontroller specialist
Most pll literatures seems to spend a great deal on the behavioral level analysis to determine best behavioral level parameters, for example, Kvco for VCO gain, Kpd for Phase detector gain, etc., but say very little about the connections between behavioral level parameters and the ckt level or transistor level parameters. Take for example, once I k
Hi The STM32 DS says it can switch I/O as fast as 50MHz But you have to configer the clock & pll to work as fast as this micro can - 72MHz All the best Bobi The microcontroller specialist
Basically, it's a pll with a very low loop bandwidth. Characteristics of pll building blocks (e.g. phase detector) and loop calculation method's in pll literature also apply in this case.
Simulate a pll and then you will only learn it, there are so many details that you will learn in the process. You will be surprised.