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參數(shù)資料
| 型號： | HSP50110JI-52 |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Digital Quadrature Tuner |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQCC84 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大小： | 199K |
| 代理商： | HSP50110JI-52 |
3-237
and less as a high order decimating filter. This is evident by
the narrow alias free part of the output bandwidth as shown
in Figures 8 and 9. The more rapid roll off of the third order
CIC produces an output spectrum containing a much higher
usable bandwidth versus output sample rate as shown in
Figures 10 and 11. For example, the aliasing noise at F
S
/4
for the uncompensated third order CIC filter is approximately
~29dB below the full scale input.
Understanding the Alias Profile
For digital filters that utilize decimation techniques to reduce
the rate of the digital processing, care must be taken to
understand the ramifications, in the frequency domain, of
decimation (rate reduction). Of primary concern is the “noise”
level increase due to signals that may be aliased inside the
band of interest. The potential magnitude of these signals
may render significant portions of the previously thought
usable bandwidth, unusable for applications that require
significant (>60dB) attenuation of undesired signals.
Consider a digital filter with sampling frequency fs, whose
frequency response shown in Figure 12A, the top spectrum.
At first glance the usable bandwidth would appear to be the
3dB bandwidth of the main lobe. This filter is to be
decimated to a rate of 1/8 f
S
. We concern ourselves with
those elements less than f
S
/2, as shown in Figure 12B. The
decimation process will fold the various lobes of the
frequency response around the new sampling folding
frequency of f
S
/2R. The first lobe is folded over the dotted line
and a significant portion of the first lobe appears in the
passband of the filter. Any unwanted signals in this part of the
spectrum will appear in the band of interest with the greatest
amplitude. The second lobe is translated down to be centered
on the dashed line. The third lobe is spectrally inverted and
translated to be centered on the dotted line. The fourth lobe is
simply translated to be centered on the dotted line. If there
were more lobes to the filter, the process would continue to
spectrally invert the odd numbered lobes prior to translation to
f
S
/2R. This process is shown in the “C” portion of Figure 12.
FIGURE 8. ALIAS PROFILE: INTEGRATE/DUMP FILTER, NO
COMPENSATION
FIGURE 9. ALIAS PROFILE: INTEGRATE/DUMP FILTER
WITH COMPENSATION
FIGURE 10. ALIAS PROFILE: 3RD ORDER CIC,
NO COMPENSATION
FIGURE 11. ALIAS PROFILE: 3RD ORDER CIC WITH
COMPENSATION
SAMPLE TIMES
M
10
0
-20
-30
-40
-600
-50
-10
FILTER RESPONSE
ALIAS PROFILE
f
S
16R
f
S
8R
3f
S
16R
f
S
4R
5f
S
16R
3f
S
8R
7f
S
16R
f
S
2R
(EXAMPLE PLOTTED IS FOR R = 64
WITH 64 SAMPLES/SYMBOL)
SAMPLE TIMES
M
10
0
-20
-30
-40
-600
-50
-10
f
S
16R
f
S
8R
3f
S
16R
f
S
4R
5f
S
16R
3f
S
8R
7f
S
16R
f
S
2R
(EXAMPLE PLOTTED IS FOR R = 64
WITH 64 SAMPLES/SYMBOL)
ALIAS PROFILE
FILTER RESPONSE
SAMPLE TIMES
M
10
0
-20
-30
-40
-600
-50
-10
f
S
16R
f
S
8R
3f
S
16R
f
S
4R
5f
S
16R
3f
S
8R
7f
S
16R
f
S
2R
(EXAMPLE PLOTTED IS FOR R = 64
WITH 64 SAMPLES/SYMBOL)
FILTER RESPONSE
ALIAS PROFILE
SAMPLE TIMES
M
10
0
-20
-30
-40
-600
-50
-10
f
S
16R
f
S
8R
3f
S
16R
f
S
4R
5f
S
16R
3f
S
8R
7f
S
16R
f
S
2R
(EXAMPLE PLOTTED IS FOR R = 64
WITH 64 SAMPLES/SYMBOL)
FILTER RESPONSE
ALIAS PROFILE
HSP50110
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HSP50110JC-52 | CONN HEADER HM 2MM 100POS |
| HSP50110 | Digital Quadrature Tuner(數(shù)字調(diào)諧器) |
| HSP50210 | Digital Costas Loop(數(shù)字Costas鎖相環(huán)) |
| HSP50214VC | Programmable Downconverter |
| HSP50214VI | Programmable Downconverter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HSP50110JI-52Z | 制造商:Intersil Corporation 功能描述:PB-FREE W/ANNEAL DIGITAL QUADRATURE TUNER 84 PLCC,52MHZ,INDU - Rail/Tube |
| HSP50210 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digital Costas Loop |
| HSP50210JC-52 | 功能描述:上下轉(zhuǎn)換器 COSTAS DEMODULATOR,84 PLCC,52MHZ,COMM RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50210JC-52Z | 功能描述:上下轉(zhuǎn)換器 COSTAS DEMODULATOR 84 PLCC 52MHZ COM RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50210JI-52 | 功能描述:上下轉(zhuǎn)換器 COSTAS DEMODULATOR,84 PLCC,52MHZ,IND RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
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