- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16544 > AD9520-5/PCBZ (Analog Devices Inc)BOARD EVAL FOR AD9520-5 PDF資料下載
參數(shù)資料
| 型號： | AD9520-5/PCBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/76頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9520-5 |
| 設(shè)計資源： | Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121) Phase Coherent FSK Modulator (CN0186) AD9520 Eval Brd Schematic AD9520 BOM |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 計時，時鐘發(fā)生器 |
| 已用 IC / 零件： | AD9520-5 |
| 已供物品： | 板 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁當(dāng)前第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁
AD9520-5
Data Sheet
Rev. A | Page 24 of 76
TERMINOLOGY
Phase Jitter and Phase Noise
An ideal sine wave can be thought of as having a continuous
and even progression of phase with time from 0° to 360° for
each cycle. Actual signals, however, display a certain amount
of variation from ideal phase progression over time. This
phenomenon is called phase jitter. Although many causes can
contribute to phase jitter, one major cause is random noise,
which is characterized statistically as being Gaussian (normal)
in distribution.
This phase jitter leads to a spreading out of the energy of the
sine wave in the frequency domain, producing a continuous
power spectrum. This power spectrum is usually reported as a
series of values whose units are dBc/Hz at a given offset in
frequency from the sine wave (carrier). The value is a ratio
(expressed in decibels) of the power contained within a 1 Hz
bandwidth with respect to the power at the carrier frequency.
For each measurement, the offset from the carrier frequency is
also given.
It is meaningful to integrate the total power contained within
some interval of offset frequencies (for example, 10 kHz to
10 MHz). This is called the integrated phase noise over that
frequency offset interval and can be readily related to the time
jitter due to the phase noise within that offset frequency interval.
Phase noise has a detrimental effect on the performance of ADCs,
DACs, and RF mixers. It lowers the achievable dynamic range of
the converters and mixers, although they are affected in somewhat
different ways.
Time Jitter
Phase noise is a frequency domain phenomenon. In the time
domain, the same effect is exhibited as time jitter. When observing
a sine wave, the time of successive zero crossings varies. In a square
wave, the time jitter is a displacement of the edges from their
ideal (regular) times of occurrence. In both cases, the variations in
timing from the ideal are the time jitter. Because these variations
are random in nature, the time jitter is specified in seconds root
mean square (rms) or 1 sigma of the Gaussian distribution.
Time jitter that occurs on a sampling clock for a DAC or an
ADC decreases the signal-to-noise ratio (SNR) and dynamic
range of the converter. A sampling clock with the lowest possible
jitter provides the highest performance from a given converter.
Additive Phase Noise
Additive phase noise is the amount of phase noise that can be
attributed to the device or subsystem being measured. The phase
noise of any external oscillators or clock sources is subtracted.
This makes it possible to predict the degree to which the device
impacts the total system phase noise when used in conjunction
with the various oscillators and clock sources, each of which
contributes its own phase noise to the total. In many cases, the
phase noise of one element dominates the system phase noise.
When there are multiple contributors to phase noise, the total is
the square root of the sum of squares of the individual contributors.
Additive Time Jitter
Additive time jitter is the amount of time jitter that can be
attributed to the device or subsystem being measured. The time
jitter of any external oscillators or clock sources is subtracted.
This makes it possible to predict the degree to which the device
impacts the total system time jitter when used in conjunction with
the various oscillators and clock sources, each of which contributes
its own time jitter to the total. In many cases, the time jitter of the
external oscillators and clock sources dominates the system time
jitter.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ACM06DRYN | CONN EDGECARD 12POS DIP .156 SLD |
| SPD42R-823M | INDUCTOR PWR SHIELDED 82UH SMD |
| EBA30DTKS | CONN EDGECARD 60POS DIP .125 SLD |
| CDK2000-LCO | KIT EVAL PROTOTYPING CS2300-CP |
| ECE-T2GP821FA | CAP ALUM 820UF 400V 20% SNAP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9521JH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521KH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521SE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521SH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
| AD9521TE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Log/Antilog Amplifier |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。