英語 での The phase noise の使用例とその 日本語 への翻訳
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Increasing the power supply will also lower the phase noise.
This helps to reduce the phase noise of the input clock source.
Up to 2kHz, the reference oscillator dominates the phase noise.
Display magnitude response of filter defined by the Phase Noise block.
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For signal levels above -10dBm, the phase noise of the LO buffers becomes important.
Regulator 1/f noise modulates onto the RF carrier also and contributes to the phase noise profile.
Figure 4. Note that in each graph presented, the phase noise follows the expect 20dB per decade roll-off.
Note that the phase noise of the external reference needs to exceed -140dBc/Hz at offsets of 1kHz to 100kHz.
Where foffset is the frequency offset in Hz and L is the phase noise level in dBc/Hz.
The Phase noise level(dBc/Hz) and Frequency offset(Hz) parameters must have the same length.
ADIsimCLK calculates broadband jitter, which integrates the phase noise above a 1-kHz offset.
The phase noise is flat from 0 Hz to the smallest frequency offset, and from the largest frequency offset to fs/ 2.
Expect the phase noise of the MAX2607 to follow the same roll-off exhibited by all the VCOs in this family.
Specifically, the phase noise and tuning characteristics were inferior to what could be routinely achieved in discrete designs or VCO modules.
Consequently, the practical way to measure the phase noise uses a setup that eliminates the spectrum energy at fC.
The phase noise of a clock frequency influences DAC and makes the time interval irregular. This phenomenon is called jitter see the figure below.
Reference phase noise profile at 122.88 MHz. PLL1 relies on a high-performance VCXO andlow loop bandwidth to attenuate the phase noise of the reference, allowing the phase noise of the VCXO to dominate.
Figure 3 compares the phase noise profile of the Crystek CVHD-950 VCXO and the reference input phase noise.
In a manner similar to VCO noise, the phase noise contribution of the LDO can be modeled as an additive component, ΦLDO(t), as shown in Figure 4.
In such a case, the RMS JPER within a certain band can be calculated by:Approximation of RMS JPER from L(f) The phase noise usually can be approximated by a linear piece-wise function when the frequency axis of L(f) is in log scale.
For example, the phase noise performance is better than -100 dBc/Hz in the 79 GHz frequency band with an offset of either 10 kHz or 100 kHz.
In case of 77/79 GHz automotive radar, the phase noise performance is important to detect the objects at short distance and person moving slowly.
This means that the phase noise measured in the maximum FCC bandwidth of 100kHz will be at least 35dB less than the carrier power 500kHz from the carrier.