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149 Threads found on edaboard.com: Pll Power
Hi! I'm designing a grid tie inverter. The important thing is it's synchronization with grid sinusoidal waveshape both in phase and frequency. I was planning to use pll 4046B IC who will be given power from Vdd = 5 VDC. I'm not used to pll so much so my thinking was that it will generate a sinusoidal wave of same phase and frequency as (...)
Hello, does anybody know that which kind of jitter is measured by spectrum analyzer for the pll and which kind of jitter is mostly reported in the pll papers? Thanks
Hi, i want to get the overall pnoise of the pll in Matlab, so i firstly stimulus the pnoise of several components in the cadence ADE, the simulation pnoise of Divider is about -120~-130dBc/Hz, and the noise power spectral density is about -160~-170dB/sqrt(Hz), i want to know is it normal? if it's correct, what's the relationship between the divider
Why are you thinking of a Gunn device? At that frequency you will be able to achieve far better stability and far greater power efficiency by using conventional pll or DRO circuits. A Gunn diode has to be in a tuned cavity so you would be looking at a fairly large construction, something like 75x75x75mm cast metal cube. Brian.
Guess you are asking about conditions to operate a grid tied inverter as in your previous threads? Islanding avoidance would be one consideration, also pll lock.
The problem is most probably due to unwanted RF feedback into the pll circuitry. Try to keep that bundle of red wires away from the RF power stage. Even better maybe to use a multi-core shielded cable to help keep any RF out of sensitive areas. The BA1404 is a terrible stereo encoder but will not cause the problems you are having.
A standard solution uses an all-digital pll with the grid voltage as reference, comprised of ADC, multiplier phase detector, PI loop filter, NCO with sine table. To generate the sine pwm, the NCO signal has to be multiplied with a factor to adjust the output to the actual grid voltage, usually driven by a current/power control loop. Fitting the
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 where o
Hi all, I have a question on FDD system such as WCDMA, in a given WCDMA RF circuit, are there two separate pll/VCO parts which means one for Tx. and the other for Rx.? I think it's true in FDD system such as WCDMA because FDD is full duplex system and the Tx. and Rx. circuits are working together all the time. Pls.kindly explain if there is
Hi, I have designed a pll that can output square waves as well as sine waves (by adding filters). The signal of the pll should go to a mixer that will transmit the LO+ signal when its data input is '1' and transmit LO- signal when data input is '0'. Overall the output of the mixer is a BPSK signal whether the LO signal is square or sine. Now I ha
an injection locked ring oscillator is NOT A pll! so lets start there. how are u injecting the subharmonic? How are you removing the oscillating power? what are you doing to make the ring oscillator ONLY free run at the output frequency?
Why on earth do you want to put so much power into a pll? Most pll's are senstitive on clock inputs. How about one or two resistors?
what is your application? you need a pll that its output follows voltage angle and a Park transform. then determine Iq (which is perpendicular to voltage vector) amplitude according to your demanded power factor. all can be implemented by software in DSP or MCU. Good Luck
Hello everyone, My research topic is related to biomedical field. The modulation technique including amplitude shift keying(ASK), frequency shift keying(FSK) and binary phase shift keying(BPSK) was normally used in wireless transmission. Some material told me that only ASK modulation technique could achieve with non-coherent demodulation,
Its funny. but I own the TDS210 and love it with EIA488/RS232 options but never used it. THe Rigol 100MHz is much newer with nice memory save to USBstick features with FFT and X ( for power calculations) But I believe no company makes a better trigger design than Tektronix for pll capture, stability phase noise and glitch rejection. it depends
pll generates new clock by multiplying reference xN by an Integer counter / N in the feedback loop to the mixer. Thus clk_4x is the VCO output which drives /4 counter to mix at 1x phase detector and vco/2 counter out to get clk_2x However to get a 3 phase output requires a divide by 3 counter with 3 gate combinations to generate each phase at 1
There are several different technologies for oscillators (~100MHz) such as crystal, MEMS, SAW, etc., and I am looking for a frequency reference for a pll such as the ADF4002. My application is the detection of electron spin resonance using a fixed RF magnetic field combined with swept DC magnetic field over a period of a few minutes. Since I am det
Hi.. I am looking for a PASSIVE pll component that I can use after VCO followed by 2 way power divider in my design. I have searched for pll but i have found active ones...!!! Frequency is approximately 900MHz VCO------PASSIVE pll-----2-WAY power DIVIDER Regards
when u using internal oscillator " FAST RC OSCILLATOR (FRC) " that time pll is apply but onther config setting like internal " LOW power RC OSCILLATOR (LPRC) " u not apply pll of internal Oscillator . and also try to disable WDT .
What is the necessity of pll(Phase Locked Loop)? ARM controllers supports pll concept. What is the advatage of pll in advanced controllers?
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)
Hi, buddy Do you have any books or papers about the latest clock and reset logic design for the current SOC which become more and more complex and will have all kinds of power domain. For example, I came across a clock/reset problem in the real silicon: I used pll's stable signal as some clock dividers' reset which is the async-asserted and
It would purely depend upon your scenario, some of which could be : You can add additional power stripes at the hotspot. If you found hotspot around macros (usually power hungry macros like pll, analog macros) , you can make power rings around your macro. If your standard cell density is huge at the hotspot, try adding (...)
Hi, I am working on a low power transceiver for Wireless Body area network protocol. How do I get the phase noise specs of my pll from the protocol specs. The protocol specifies the transmitter specs like EIRP, transmit mask etc. and receiver specs like sensitivity , ACPR etc.
80032 If I want to put this LF in pll, how can I do the stability analysis. As there is no dc path from i/p of amp to o/p of amp, the LF(amplifier) wont get its operating points in STB or AC analysis.
Communications, Position Locating, Imaging/Detection, Microwave Heating, and various Military Systems (Radar, ECM, EW). Oscillators, pll/Synthesizers, Very low phase noise synthesizers. Transceivers. Filters--all types. Switches, Limiters, High power PIN devices. Design services, full test lab, turnkey manufacturing options. Can review
Integrators are commonly used in pll's to stabilize the loop But the initial condition with power-on or siignal-on will depend on several factors. In order to make the design survive you must minimize the VCO error to be within your pll capture range, so initial condition must be considered random. Some people use dual mixers or (...)
Hi every one. I have 10.000000 MHz Oscillator and I want to use it as a reference signal to my pll. My problem is when I show the frequency of oscillator the frequency has -+100Hz deviation. I tried a lot to fixed it but nothing happen. Suddenly I used 1Kohm potentiometer between 3.3 Volt power supply and input of oscillator and I tried to turn the
To avoid pulling I select offset pll structure. But at fractional frequency the on-chip PA deteriorates pll IPN so much, larger power out worse IPN. At integer frequency it's OK. In open loop test the VCO performance doesn't change. If does PA affect N-divider, PFD or CP's linearity? What's the path and mechanism? Thank you.
I can only say: o_O but are you sure you make a complete power-up Cycle??? The pll doesn't work right after programming the fuses... You need to turn power off.. and then turn power on... The same to disable it...
The Zc(control charge pump) of MB15E03SL of pll IC , if connect with PS(power saving) of MB15E03SL of pll IC. Question 1, Will it happen return current to Zc pin and cause abnormal consumption current of pll IC ?? Question 2, Will it happen Close Loop VCO Lock Time abnormal?? because while measuring Lock Time , (...)
Hi, I'm running a project on PIC18F46k22 with 20Mhz Quartz crystal, In configuration I have selected : 1. HS Oscillator (high power > 16Mhz) 2. Oscillator 4X pll Enable - Oscillator multiplied by 4 Is now the system running at 20 x 4 = 80Mhz or is it at its maximum frequency 64 MHz (as described in datasheet) I'm bit confused please rep
We were assuming he knows that he will need a < 100 Hz loop bandwidth in the pll. FM receivers do not work at low frequencies, so he can throw away the 20 Hz to 100 Hz range with some impunity.
My basic problem is that I would like to clock my FPGA at a very specific frequency multiple (over a million) of an incoming signal. This incoming signal is wall power, so it is 60 Hz, plus or minus, and slowly varying. My original approach was to purchase a VXCO at this frequency that had the largest pull range I could find (+/-200ppm), divide t
I m currently doing an assignment regarding pll(phase locked-loop). I would like to ask whether is there any way to use THE FREQUENCY to control the turning direction of the MOTOR. Or is there any way to make use of the frequency as CONTROLLER to control the motor. I would like to use this to design an autogate, a small size one. Just for demo purp
I am looking to partner up with an experienced all round RF engineer that can help me complete a design for a 12v DC powered pll tuned low power AM transmitter for the 160m (1.8-2.0MHz) amateur band. I already have a fairly well developed crystal controlled transmitter design and there are a whole bunch of fairly simple (...)
hello everyone i m new here.i m badly in need of a design of 100W grid connected pv inverter using pll bcoz it is my project to complete graduation and have to submit within 30 days.
For one power pin... This pin is a special pin like power for analog pll or somewhat other senitive thing, right? :) In this case you often can simplify your life by deleting some unneeded capacitors. Often these caps are installed only because of datasheet typycal recommendations and without any calcula
If you going to change other components change the LM555 and use digital counter or pll
Well, you can think what you wish, but that is the dc feedback path. The op amp is an integrator, and is a very common pll loop filter circuit. Without feedback, it would simply go to one of the supply rails a millisecond after you turn on the power supply.
Dear microwave friends, I need to generate a pll locked signal at around 100GHz, power between 10-100mW. pll comparison frequency, freq step, bandwidth, etc... are all free parameters for now. The cost will surely go beyond $10.000, so let's forget the budget and concentrate on the technical stuff for now. I don't want to reveal my (...)
A detailed project specification could clarify a lot. I would expect a rather limited frequency range (assuming it's about mains power) at worst 50 - 60 Hz plus some margin. That's not a reasonable FFT application. I would either think about a digital band pass filter, a FFT-like Goertzel filter, or a pll.
I found that ADF4106 evaluation board using three 18 ohm resistors as power divider in pll at 5.6GHz. Now I want to design a 8GHz synthesizer,could this circuits be used at 8GHz? Or I have to use a microwave power divider in microstrip? Thanks!
I want to work outside China, such as Europe, North American, NewZealand, Australia, South Korea, Singapore, Japan, etc. I have more than 5-years experiences in designing RF module for 18GHz~38GHz PDH and SDH microwave point-to-point telecomm, including LO module (pll, VCO, DRO), Freq Multiplier Module, power Detector, TX module, RX module in Be
PWM has its use in power supply, where pll is a communication circuit. In PWM if your input voltage is within specified range it will give fixed output voltage; to get more idea on these find some datasheets definition for pll, a pll is an electronic circuit with a voltage or current driven oscillator that is constantly (...)
hi i want to build a low power transmitter and receiver which can send and receive data at 1.6ghz now i have two idea going around in my mind 1. to design a pll based frequency synthesizer for 100 mhz and then using a frequency multiplier to multiply the frequency 16 times to get 1600 mhz final frequency 2. to directly design a pll (...)
Hello guys, I would like to ask you question about following RF modules: the first one is: and second one: First one has output power about 2 dBm and uses pll oscillator and second has output about 28 dBm what is much more the
Hi friends, I need 1. A power divider to give two equal outputs of 3dB down each from 1MHz to 10MHz at input= 0dBm. 2. A pll based circuit for frequency doubler. Fin=1MHz to 10 or12MHz Could you please suggest for components and mfg names.
Hi all, I used an ideal power supply (constant= Vdd) to simulate a pll. Now I wanna simulate it again but with a non ideal source. I used the vsin source from the analoglib (I put it in serie with the Vdc source) in order to make power supply oscillate around the idea Value Vdd. Actually I have no Idea how much I have to set the (...)
All, I have an issue with my pll locking .. The ripple in my VCO control voltage is non uniform its kind of fluctuating up and down ..B'caz of that my VCO (LC -866MHz .. 1.1547n sec) o/p frequecy is also fluctuating ..i.e. the adjacent cycles of my VCO o/p do not have same clock period slightly varies by 30-50ps in a regular pattern