參數(shù)資料
型號: HSP50214AVI
廠商: HARRIS SEMICONDUCTOR
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
文件頁數(shù): 16/60頁
文件大小: 467K
代理商: HSP50214AVI
16
.
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).
C
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
2
-25
2
-26
2
-27
2
-28
2
-29
2
-30
2
-31
2
-32
2
-33
2
-34
2
-35
2
-36
2
-37
2
-38
2
-39
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-1
2
-2
2
-3
0
A
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-1
2
-2
2
-3
0
I
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-1
2
-2
2
-3
0
I
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
2
-25
2
-26
2
-27
2
-28
2
-29
2
-30
2
-31
2
-32
2
-33
2
-34
2
-35
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-1
2
-2
2
-3
0
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
2
-25
2
-26
2
-27
2
-28
2
-29
2
-30
2
-31
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-1
2
-2
2
-3
0
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
2
-25
2
-26
2
-27
2
-28
2
-29
2
-30
2
-31
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-1
2
-2
2
-3
0
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
2
-25
2
-26
2
-27
2
-28
2
-29
2
-30
2
-31
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-1
2
-2
2
-3
0
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
2
-11
2
-12
2
-13
2
-14
2
-15
2
-16
2
-17
2
-1
2
-2
2
-3
0
A
A
A
A
NOTE: If 14 input bits are not needed, the gain adjust can be in-
creased by one for each bit that the input is shifted down at the
input. For example, if only 12 bits are needed, an offset range of
24dB is possible for a decimation of 24.
FIGURE 16. CIC FILTER BIT WEIGHTING
O
(
(
O
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
HSP50214A
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