HSP43124 Ver la hoja de datos (PDF) - Intersil
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HSP43124 Datasheet PDF : 18 Pages
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HSP43124
INPUT TO
HALFBAND
Fs
SECTION
FNORMALIZED = Fs
MUX5
FNORMALIZED = FHB1
HB5 35 TAP
Fs/2
01
FHB1= Fs or Fs/2
MUX4
FNORMALIZED = FHB2
HB4 23 TAP
FHB1/2
01
FHB2 = FHB1 or FHB1/2
MUX3
FNORMALIZED = FHB3
HB3 19 TAP
FHB2/2
01
FHB3 = FHB2 or FHB2/2
MUX2
FNORMALIZED = FHB4
HB2 11 TAP
FHB3/2
0
1
FHB4 = FHB3 or FHB3/2
MUX1
HB1 7 TAP
FHB4/2
01
OUTPUT OF
HALFBAND SECTION
MULTIPLEXERS’ DECODER TABLE AND EQUATIONS
BITS2-0 MUX1 MUX2 MUX3 MUX4 MUX5
000
0
0
0
0
0
001
0
0
0
0
1
010
0
0
0
1
1
011
0
0
1
1
1
100
0
1
1
1
1
101
1
1
1
1
1
MUX1 = (BIT2 AND BIT0) AND BIT1
MUX2 = BIT2
MUX3 = (BIT1 AND BIT0) OR BIT2
MUX4 = BIT1 OR BIT2
MUX5 = BIT0 OR BIT1 OR BIT2
INVALID = BIT2 AND BIT1
FIGURE 10A. BLOCK DIAGRAM OF FIXED COEFFICIENT
HALFBAND FILTERS
STAGE 1
FCLK
4
FCLK
2
3FCLK
4
FCLK
STAGE 2
FCLK FCLK
8
4
FCLK
2
FCLK
STAGE 3
FCLK FCLK FCLK
16 8
4
FCLK
2
FCLK
STAGE 4
FCLK FCLK FCLK
FS
32 8
4
2
FCLK
16
STAGE 5
FCLK
FCLK
64
FCLK FCLK FCLK
32 8
4
FS
2
COM-
POSITE
FILTER
FCLK
FCLK
64
FCLK
FIGURE 10B. SPECTRAL COMPOSITION OF FIVE CASCADED
HALFBANDS
0
-20
6dB BANDWIDTH
-40
-60
-80
-100
-120
-140
-160
HB1 TRANSITION BW
HB2
HB3
HB4
HB5
-180
-200
0.125
0.25
0.375
0.5
NORMALIZED FREQUENCY
(NORMALIZED TO OUTPUT FREQUENCY)
FIGURE 10C. COMPOSITE RESPONSE OF FIXED COEFFI-
CIENT HALFBAND FILTERS WITH RESPECT TO
THE NORMALIZED FREQUENCY SHOWN IN FIG-
URE 10A
9
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