Examples of using Loop filter in English and their translations into Japanese
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Colloquial
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Ecclesiastic
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Computer
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Programming
Loop Filter for PLL.
The circuitry within the box is the PLL loop filter.
Application to loop filter for PLL is shown in Fig. 13.
You can also experiment with the H. 264"loop filter" option.
The corresponding loop filter component values are shown in the following table: Table 1.
Audio equipment LED backlight driver PLL synthesizer loop filter Energy harvesting.
The loop filter is lowpass for reference noise and highpass for VCO noise.
Phase noise will be too high around 1MHz;however, the loop filter will help attenuate this.
The in-band(inside the PLL loop filter bandwidth) phase noise is directly influenced by the value of N.
Note that the reference oscillator will contribute noise,but mostly at offsets lower than the loop filter bandwidth.
Phase noise is constant through the loop filter corner frequency and begins to roll off after that.
The loop filter will likely need to change time constants when changing mode, and this will add some extra circuitry.
Below 20kHz the phase noise for this VCO is too high,but the PLL loop filter bandwidth can be designed to suppress low-offset VCO noise.
The noninverting loop filter configuration does not require a dedicated bias, so it can be a more compact solution.
A complete 100MHz intermediate frequency(IF)design solution is offered including voltage controlled oscillator(VCO), loop filter components, and performance plots.
Loop filter: Integrates the current pulses from the charge pump, providing a clean voltage to the VCO tuning port.
In today's IC designs, all PLLs and VCOs are integrated into the chip;most PLLs utilize digital current-charge-pump outputs to control the VCO through a loop filter.
By incorporating an external loop filter, phase lock loop with low phase noise can be achieved without taking large space on PCB.
The IF LO signal was generated andregulated by the on-chip synthesizer in conjunction with external tank and loop filter components comprising an IF phase-locked loop PLL.
Third, the resistors and capacitors used to implement the loop filter should be placed as close as possible to the PLL chip using the values that were recommended by the simulation file.
Loop Filter Components The loop filter bandwidth used at 240kHz comparison frequency is around 12kHz, and is approximately 7kHz bandwidth for the 80kHz comparison frequency case.
The extremely low voltage and low current noise, high speed, and wide output swing of the OPA2211-EPseries make these devices an excellent choice as a loop filter amplifier in PLL applications.
Although an external RF VCO module, loop filter, and internal RF PLL synthesizer could have been used the requisite VCO module was not available at the time of testing.
PLL2 uses an internal high-speed VCO centered at 3.8 GHz(3 GHz for the AD9523-1)and a partially embedded third-order loop filter to give it a nominal loop bandwidth of about 500 kHz.
When used as PLL synthesizer loop filter, since the dielectric absorption is smaller than that of high dielectric constant MLCC, switching time called the lock-up time can be greatly shortened.
In addition, both simulation and the prototyping on a real board should be performed to confirm that the circuit will meet specifications given the parasitic elements on the PCB layout and the tolerances of resistors andcapacitors in the loop filter.
Combined with an external reference oscillator, loop filter, and VCO, the device forms an ultra-low noise and low-spur frequency synthesizer capable of accepting RF input frequencies of up to 12.4GHz.
Thus, as the loop filter corner is pushed farther out, the integrated phase error of the LO signal is increased according to the following equation: Integrated Noise 10 x log(F2/F1) where F1 and F2 are the narrow and wide loop bandwidths respectively.
The AK5703's integrated PLL includes a loop filter, which used to be required externally, operates from a system clock frequency(such as USB and video) so the clock required for audio playback can be generated internally.
When combined with an external reference oscillator and loop filter, the MAX2871 is a high-performance frequency synthesizer capable of synthesizing frequencies from 23.5MHz to 6.0GHz while maintaining superior phase noise and spurious performance.