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Pll Frequency Synthesizer

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109 Threads found on Pll Frequency Synthesizer
Hi all I have a question about spread spectrum and its use with pll synthesizer Let's say I have a clock source that is generating 100 MHz clock with 5000 ppm down spread with 33 kHz frequency modulation profile. Thus, the minimum and maximum frequency from this source is 99.5 MHz and 100 MHz, respectively. Then (...)
Hello, I am trying to design a frequency synthesizer with the use of the CD4046B IC which is a pll. Based on some research I have done I see that this is possible with the addition of a divide by N counter in the feedback loop between the VCO and phase comparator input. Before doing this there are resistors and capacitors that have to be (...)
Here is datasheet and it says "The TSA5512 is a single chip pll frequency synthesizer designed for TV tuning systems." But from what I can see it's just pll, and requires external crystal and puts out voltage according to phase difference between crystal oscillator and RF in. If I understood correctly, TSA551
I would like to generate fully differential quadrature signals of 950MHz using pll frequency synthesizer from 1900MHz differential VCO with low power. Currently, I realize this by D-FF based on master-slave latch structure using CML. However current consumptions are fairly large. Alternate idea I have is using two D-FFs based on TSPC (...)
You can design a frequency synthesizer (which just multiplies frequency) .. Or you can design AM or FM detectors via pll ..
i am using adf4153 in that for single frequency 1800MHz my code is locking.whereas if i change the frequency to 1810MHz i have program R0 register and restore the new values to how i have to store the new R0 value to the old one
Hello, What is Input Channel and Output channel of pll frequency synthesizer (ADF4112BRUZ), how can i get it from PIN DIAGRAM.
Hi, I implemented a integer-N pll based frequency synthesizer but it takes 2m second to lock at desired frequency. But my adviser didn't accept it. Now I want to use DDFS but my project's details are as below: 1- output frequency between 880 MHz and 912 MHz 2- reference frequency 880 (...)
Hi, I'm simulating a pll based frequency synthesizer using dual modulus prescaler. I know I should divide output with MP+A while A is programmable down counter. The theory is "N=A(P+1)+(M-A)P=MP+A". I found a control logic as below to realize this. My question is how to implement "+A" in divider? I mean I can divide by MP but what about (...)
As far as I know. Lock time only applies if you are using a pll. The DDS by design does not have a lock time. The time it needs to change the frequency is just the time to update the phase increment register. Which is added to the phase accumulator on each clock pulse. frequency changes immediately . Some DDSs update this register on the (...)
Hello, I am trying to develop a synthesizer that will supply changeable LO signal between 950MHz to 2300MHz or at least between 950MHz to 2070MHz. I need this synthesizer to achieve frequency lock as fast as possible, let's say 500uS maximum. From what I found in order to achieve this wide range of frequency I'll have to (...)
jitter. it's what will make or break it.. plus PSRR. with plls low frequency noise on the supply.. especially on the loop filter if it's active, will kill everything. (clue.. don't share power supply for data drivers with pll.. seen it done on ICs, always an unmittigated disaster)
Iam programming the pll through PIC micro controller. i need help in deciding the required phase detector frequency for 10MHz reference frequency.
Hi Funkymix89 If you do not know circuit design this project is top for you. To be honest i have some circuit design background but when design pll I have a lot of problem with it. Maybe someone can help him?
In a Phase-modulation scheme,rms phase error is very critical,it should be less than 2deg in most cases. This rms phase error directly relates to in-loop phase noise of pll output. while working with pll frequency synthesizer, we come across two formulae to calculate phase noise: 1) in-loop (...)
Thanks biff44 I downloaded the Ti CodeLoader as you said. It seems to be very useful to configure and test a prototype. Regrettably when I select any of the plls in the menu the program gives a "Runtime error 13 - type mismatch" and cancels. I will try to make it work later. Anyway I am not concerned about divisor codes but in the minimum frequen
Hi, I have to realize in VHDL a frequency synthesizer in order to generate frequencies from 5Khz to 20Khz with 1Hz step or more if not possible so fine frequencies. This is the The N divider is made in VHDL(others are ex
Hi! I want to realize a frequency synthesizer (1 GHz-3GHz) with pll. I choosed the ADF4113. But i found another pll from linear technoology with integrated VCO: LT6946-3. I need now your help: what is the diffrence? which way is better? i hope you cuold help me!
Hi guys, I am measuring a fractional-N pll based frequency synthsizer these days, and I encounter a tough spur problem as below: the synthesizer is used in a wireless SoC for RF applications, it is found that there are two -20dBc spur (located@+/-700kHz offset) at the synthesizer output, it is quite large; when the (...)
I'm designing 0 - 8 GHz pll frequency synthesizer. I need help to buld the PCB Layout in Ansoft. I don't know how to Draw Foot prints in Ansoft. Can anybody help. It'll also be helpful if anyone can suggest me some documents in PCB layout designing using Ansoft.....................