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參數(shù)資料
| 型號： | HSP50214VC |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Programmable Downconverter |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP120 |
| 封裝： | MQFP-120 |
| 文件頁數(shù)： | 15/54頁 |
| 文件大?。?/td> | 395K |
| 代理商： | HSP50214VC |
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15
Halfband Decimating Filters
The Programmable Down Converter has five halfband filter
stages, as shown in Figure 17. Each stage decimates by 2
and filters out half of the available bandwidth. The first half-
band, or HB1, has 7 taps. The remaining halfbands; HB2,
HB3, HB4, and HB5; have 11, 15, 19, and 23 taps respec-
tively. The coefficients for these halfbands are given in Table
4. Figure 18 shows the frequency response of each of the
halfband filters with respect to normalized frequency, F
N
.
Frequency normalization is with respect to the input sam-
pling frequency of each filter section. Each stage is activated
by their respective bit location (15-20) in Control Word 7. Any
combination of halfband filters may be used, or all may be
bypassed. Figure 19 details the halfband alias profiles with
respect to normalized frequency F
N
.
Since each halfband filter section decimates by 2, the total
decimation through the halfband filter is given by:
where N = Number of Halfband Filters Selected (1 - 5).
DEC
HB
2
N
=
(EQ. 9)
F
N
= f
IN
F
HB1
= f
S
OR f
S
/2
F
HB2
= F
HB1
OR F
HB1
/2
F
N
= F
HB1
F
HB3
= F
HB2
OR F
HB2
/2
F
N
= F
HB2
F
N
= F
HB3
F
HB4
= F
HB3
OR F
HB3
/2
F
N
= F
HB4
HALFBAND
FILTER OUTPUT
HALFBAND
FILTER INPUT
CONTROL WORD 7, BIT 15
F
5
= F
HB4
OR F
HB4
/2
0
1
0
1
0
1
CONTROL WORD 7, BIT 16
CONTROL WORD 7, BIT 17
CONTROL WORD 7, BIT 18
CONTROL WORD 7, BIT 19
f
IN
= f
S
Each halfband section decimates by 2
HALFBAND FILTER 1
0
1
0
1
HALFBAND FILTER 2
HALFBAND FILTER 3
HALFBAND FILTER 4
HALFBAND FILTER 5
FIGURE 17. BLOCK DIAGRAM OF HALFBAND FILTER
SECTION
FIGURE 18. HALFBAND FILTER FREQUENCY RESPONSE
FIGURE 19. HALFBAND FILTER ALIAS CONSIDERATIONS
0
-20
-40
-60
-80
-100
-120
0.125
0.25
0.375
0.5
M
NORMALIZED FREQUENCY (F
N
)
HALFBAND FILTER 4
HALFBAND FILTER 3
HALFBAND FILTER 2
HALFBAND FILTER 1
-6dB BANDWIDTH
HALFBAND FILTER 5
M
NORMALIZED FREQUENCY (F
N
)
HALFBAND FILTER 4
HALFBAND FILTER 3
HALFBAND FILTER 2
HALFBAND FILTER 1
ALIAS
PROFILES
HALFBAND FILTER 5
0
-20
-40
-60
-80
-100
-120
0.125
0.25
0.375
0.5
-6dB BANDWIDTH
HSP50214
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| HSP50214VI | Programmable Downconverter |
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| HSP50215VC | Digital UpConverter |
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| HSP50215EVAL | DSP Modulator Evaluation Board |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HSP50214VI | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HSP50215 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:DSP Modulator Evaluation Board |
| HSP50215EVAL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:DSP Modulator Evaluation Board |
| HSP50215VC | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digital UpConverter |
| HSP50215VI | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digital UpConverter |
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