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參數(shù)資料
| 型號： | ML6421 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Triple Phase and Sinx/x Equalized, Low-Pass Video Filter(三相和Sinx/x相均衡的視頻低通濾波器) |
| 中文描述： | 三階段和氮化硅/ x均衡，低通視頻濾波器（三相和氮化硅/ x相均衡的視頻低通濾波器） |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 239K |
| 代理商： | ML6421 |
ML6421
10
Figure 6. ML6421 Reconstruction Performance in the Frequency Domain
FILTER PERFORMANCE
The reconstruction performance of a filter is based on its
ability to remove the high band spectral artifacts (that
result from the sampling process) without distorting the
valid signal spectral contents within the passband. For
video signals, the effect of these artifacts is a variation of
the amplitude of small detail elements in the picture (such
as highlights or fine pattern details) as the elements move
relative to the sampling clock. The result is similar to the
aliasing problem and causes a “winking” of details as they
move in the picture.
Figure 6 shows the problem in the frequency domain.
Curve A shows the amplitude response of the ML6421
filter, while Curve B shows the signal spectrum as it is
distorted by the sampling process. Curve C shows the
composite of the two curves which is the result of passing
the sampled waveform through the ML6421 filter. It is
clear that the distortion artifacts are reduced significantly.
Ultimately it is the time domain signal that is viewed on a
TV monitor, so the effect of the reconstruction filter on the
time domain signal is important. Figure 7 shows the
sampling artifacts in the time domain. Curve A is the
original signal, Curve B. is the result of CCIR601
sampling, and Curve C. is the same signal filtered through
the ML6421. Again the distortions in the signal are
essentially removed by the filter.
In an effort to measure the time domain effectiveness of a
reconstruction filter, Figure 8 was generated from a swept
frequency waveform. Curves A, B, and C are generated as
in Figure 7, but additional curves D and E help quantify
the effect of filtering in the time domain. Curve D and
Curve E represent the envelopes (instantaneous
amplitudes) of Curves B and C. Again it is evident in
Curve D that the envelope varies significantly due to the
sampling process. In Curve E, filtering with the ML6421
removes these artifacts and generates an analog output
signal that rivals the oversampled (and more ideal) signal
waveforms. The ML6421 reduces the amplitude variation
from over 6% to less than 1%.
Figure 5b. Typical ML6421 Reconstruction Application
< Ideal Sinc(x) response
< –3dB reference marker
< A. ML6421 Amplitude Response
< B. Signal Distortion Spectrum
< C. Reconstructed Signal Spectrum
+10
0
–10
–20
–30
–40
–50
–60
0
5MHz
10MHz
15MHz
20MHz
25MHz
FREQUENCY
R
8
DIGITAL
INPUTS
RED DAC
(CURRENT SOURCING
G
8
GREEN DAC
(CURRENT SOURCING
B
R
ANALOG
OUTPUTS
G
B
8
BLUE DAC
(CURRENT SOURCING
ML6421
DAC LOAD
ADJUSTED FOR
2V
P-P
75
75
75
+5V
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PDF描述 |
|---|---|
| ML6423 | Dual S-Video Lowpass Filter with Phase and Sinx/x Equalization(相和Sinx/x相均衡的雙S-視頻低通濾波器) |
| ML6424 | CCIR601 Video Lowpass Filter with Optional Sinx/x Correction(可選Sinx/x校正器的CCIR601視頻低通濾波器) |
| ML6425 | CCIR601 Video Lowpass Filter with Optional Sinx/x Correction(可選Sinx/x校正器的CCIR601視頻低通濾波器) |
| ML6427 | 75W Quad Video Cable Drivers and Filters with Switchable Inputs |
| ML6427CS | 75W Quad Video Cable Drivers and Filters with Switchable Inputs |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ML6421CS-1 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Triple Phase and Sinx/x Equalized, Low-Pass Video Filter |
| ML6421CS1 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML6421CS2 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML6421CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Triple Phase and Sinx/x Equalized, Low-Pass Video Filter |
| ML6421CS3 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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