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46 Threads found on edaboard.com: Dds Pll
I don't know whether you can supply 40 MHz for AD9833s MCLK. Good question. Actually you can't for two reasons. - AD9833 maximum MCLK specification is 25 MHz - PIC18 has no option to output the pll clock More generally speaking, PIC pll configuration has nothing to do with dds frequency. To safe a separate crystal oscill
tcxo... only tcxo is a clock source pll and dds rely on a clock source that determine their stability ...
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 (...)
Well, if you had a choice of using an extremely low noise crystal or saw oscillator at 100 MHz, or a crappy integrated VCO with a pll trying to clean it up inside of the dds, which one would u choose? The phase noise will be AT LEAST 20 Log (Neffective) worse. But there are additional terms...quantization noise, small discrete spurs, digital jitt
AD seems to make some nice dds chips, what do you want to do that they can't do? Those microcontrollers and ARM chips are in small feature low voltage CMOS, so I'd suspect output levels would be pretty low.
HELLO, I want to transmit a IQ wideband chirp of 250 MHz bandwidth at 10GHz frequency.Of the available dds AD9854 is the one with max. 120 MHz bandwidth. since I want a bandwidth of 250 MHz I need to use pll to increase the bandwidth. but how will I use pll ? i need quadrature pll with same reference clock only then it (...)
Hello, Here is a project of Frequency Generator with good performances for Hobbies application, or more ... if you need more accurate , buy Professional Instrument ! Use a PIC18F46K22 because it has a big ROM and RAM memory ! and can run at 40MHZ (Q=10Mhz*pll) -> 1 cycle within 100nS and 27 cycles to build dds output ! so, one
I think you can use the internal divider of an inexpensive pll (f.i. ADF4116) or a dds (f.i. AD9956)
Yes dds has more spurious than pll.They are about -60 or -70dbc and the spurious are much more than pll. It impact on the jitter of LO, so impact the final IF jitter. There is some ways to calculate jitter from spurious, you can estimate with that.
the easies thing would be to use one pll, and split the signal using phase matched cables for each receiver. You can use independent dds synthesizers running off of the same reference (after you take the phase differences out) and use a reset to each dds to restart each at the same phase everytime you change frequency. Similarly, you (...)
multivibrator and other simple oscillators suffer from drift due to aging, temperature deviations and supply voltage variations. pll resolves such problem with locking a vco with a low drift and precision XTAL oscillator(eg. tcxo). also by some modification it is possible to add modulation to the pll but for your application I think dds is (...)
Hi paramis, do you mean a noninteger ratio taking any value in some range? It is possible to have nonintegers multiplier or division frequency ratios using fractional plls or dual-modulus prescalers, but te ratios are always rational (N/M, with integers N and M). With a dds it would be possible a very wide set of possibilities. Regards Z
Hi All, I am reading Alexander Chenakin's Building a Microwave Frequency Synthesizer?Part 4: Improving Performance and saw a dual loop pll topology (Fig. 47) and dds spur reduction (Fig.41 in the article). I couldn't find any specific designs with dds+ dual loop pll topology (schematic+ performance data). Can (...)
Hello, are the spurii close -in to the generated frequency? Usually anything not extremely close-in to the generated freq (and not a harmonic either) can be considered spurii. It can be either conventionally filtered out, or cleaned with pll. So, the effects of SFDR can be combatted on occasions like this. For example, if you look at the AD9954 dat
hi everyone, i am working vhdl implementation of discrete time pll i have coded phase detector basad on analytic signal,loop filter and dds in vhdl now i want to implement the pll on fpga so i want to connect these component how can i connect these in one program please help me its urgent,,,,,,,,,,,,,,, thanks @ regard Ravi kumar (...)
you could also combine a pll with a dds chip, where the dds either sums in a phase shift via a mixer before the divider, or the dds is the pll clock, and you modulate (in small steps) the clock. These only work for low data rates due to pll settling time.
Have you looked HERE?: RF / IF ICs | Mixers / Multipliers Attenuators / VGAs / Filters Switches Integrated Transceivers, Transmitters and Receivers pll Synthesizers / VCOs Detectors Direct Digital Synthesis ( dds) & Modulators Amplifiers Modulators / Demodulators Timing IC
i am working on a frequency hopping transceiver design now i want to synchronize receiver with transmitter hopping frequencies. i am using Dpll for this . i am using a multiplier detector. what filter should i use and how can i make my dds work like VCO as in analog pll. i am working on system generator 9.2.
i am designing a phase lock loop . i need to know how can i convert a frequency input out of LPF in a pll to a corresponding frequency to lock on incoming frequency. do i need to use a dds . i m working in digital domain and input frequency is in binary form. i m using system generator. suggest me some method to do this.
You don't need a license (except the general free Q.uartus web license) for the said basic MegaFunctions. A license (respectively a Q.uartus subscription) is required for e.g. DDR controller, dds, FIR filter. You can clock multiple SERDES instances from a single pll and one pair of pll outputs, if they are using the same clock source (...)