参数资料
型号: HSP50214BVCZ
厂商: Intersil
文件页数: 17/62页
文件大小: 0K
描述: IC DOWNCONVERTER 14BIT 120-MQFP
标准包装: 24
功能: 降频器
RF 型: AMPS,CDMA,GSM,TDMA
封装/外壳: 120-BQFP
包装: 托盘
HSP50214B
HALFBAND
FILTER INPUT
0
0
0
0
0
0
F N = f S
f IN = f S
HALFBAND FILTER 1
?
2 -1
2 -2
2 -1
2 -2
2 -1
2 -2
2 -1
2 -2
2 -1
2 -2
2 -1
2 -2
2 -3
2 -3
2 -3
2 -3
2 -3
2 -3
CONTROL WORD 7, BIT 15
0
1
2 -4
2 -5
2 -6
2 -7
2 -4
2 -5
2 -6
2 -7
2 -4
2 -5
2 -6
2 -7
2 -4
2 -5
2 -6
2 -7
2 -4
2 -5
2 -6
2 -7
2 -4
2 -5
2 -6
2 -7
F N = F HB1
F HB1 = f S OR f S /2
?
HALFBAND FILTER 2
2 -8
2 -9
2 -8
2 -9
2 -8
2 -9
2 -8
2 -9
2 -8
2 -9
2 -8
2 -9
CONTROL WORD 7, BIT 16
0
1
0
2 -1
2 -2
2 -3
2 -10
2 -11
2 -12
2 -13
2 -10
2 -11
2 -12
2 -13
2 -10
2 -11
2 -12
2 -13
2 -10
2 -11
2 -12
2 -13
2 -10
2 -11
2 -12
2 -13
2 -10
2 -11
2 -12
2 -13
F N = F HB2
F HB2 = F HB1 OR F HB1 /2
?
HALFBAND FILTER 3
2 -4
2 -5
2 -14
2 -15
2 -14
2 -15
2 -14
2 -15
2 -14
2 -15
2 -14
2 -15
2 -14
2 -15
CONTROL WORD 7, BIT 17
0
1
2 -6
2 -7
2 -8
2 -9
2 -16
2 -17
2 -18
2 -19
2 -16
2 -17
2 -18
2 -19
2 -16
2 -17
2 -18
2 -19
2 -16
2 -17
2 -18
2 -19
2 -16
2 -17
2 -18
2 -19
2 -16
2 -17
2 -18
2 -19
F N = F HB3
F HB3 = F HB2 OR F HB2 /2
?
HALFBAND FILTER 4
2 -10
2 -11
2 -20
2 -21
2 -20
2 -21
2 -20
2 -21
2 -20
2 -21
2 -20
2 -21
2 -20
2 -21
CONTROL WORD 7, BIT 18
0
1
2 -12
2 -13
2 -14
2 -22
2 -23
2 -24
2 -22
2 -23
2 -24
2 -22
2 -23
2 -24
2 -22
2 -23
2 -24
2 -22
2 -23
2 -24
2 -22
2 -23
F N = F HB4
F HB4 = F HB3 OR F HB3 /2
?
HALFBAND FILTER 5
0
2 -1
2 -2
2 -3
2 -4
2 -5
2 -6
2 -7
2 -8
2 -9
2 -10
2 -11
2 -12
2 -13
2 -14
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 -25
2 -26
2 -27
2 -28
2 -29
2 -30
2 -31
2 -32
2 -33
2 -34
2 -35
2 -25
2 -26
2 -27
2 -28
2 -29
2 -30
2 -31
2 -25
2 -26
2 -27
2 -28
2 -29
2 -30
2 -31
2 -25
2 -26
2 -27
2 -28
2 -29
2 -30
2 -31
CONTROL WORD 7, BIT 19 0 1
F 5 = F HB4 OR F HB4 /2
HALFBAND
FILTER OUTPUT
? Each halfband section decimates by 2.
FIGURE 17. BLOCK DIAGRAM OF HALFBAND FILTER
SECTION
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
Since each halfband filter section decimates by 2, the total
decimation through the halfband filter is given by:
DEC HB = 2
N
(EQ. 9)
where N = Number of Halfband Filters Selected (1 - 5).
17
FN4450.4
May 1, 2007
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