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参数资料
| 型号： | HSP50210JI-52Z |
| 厂商： | Intersil |
| 文件页数： | 14/51页 |
| 文件大小： | 0K |
| 描述： | IC DEMODULATOR COSTAS 84-PLCC |
| 标准包装： | 15 |
| 功能： | 解调器 |
| 频率： | 52MHz |
| RF 型： | AM，FM |
| 封装/外壳： | 84-LCC（J 形引线） |
| 包装： | 管件 |
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HSP50210
Loop Gain, accumulated in the loop filter, limited and output to
the gain adjusters. The AGC loop tries to make the error
correction as quickly as possible, but is limited by the AGC
Loop Gain and potentially, the AGC limits. The maximum
AGC response is the maximum gain adjustment made in any
given clock cycle. This involves applying maximum Loop gain
and setting the AGC limits as wide as possible. A calculation
using only exponent terms of the various gains will be
sufficient to yield a rough order of magnitude of the range of
the AGC Loop response. The results are shaded in the last
column of Table 6 on page 14 and provided in detail in
Equations 10 and 11.
TABLE 6. AGC BIT WEIGHTING
AGC
AGC LOOP
LOOP
AGC
AGC
GAIN
FILTER
FILTER
OUTPUT
ACCUM
BIT
GAIN
ERROR
ERROR
BIT
AGC LOOP
FILTER GAIN
GAIN
MULTIPLIER
GAIN BITS
KEPT
AND AGC
LIMITS BIT
AGC GAIN
RESOLUTION
POSITION
INPUT
WEIGHT
(MANTISSA)
(OUTPUT)
(rnd)
SHIFT = 0
SHIFT = 7
WEIGHT
(dB)
22
21
Shifter → E
Shifter → E
1
0
12
6
20
19
18
17
16
Multiplier →
M
M
M
M
M
-1
-2
-3
-4
-5
3
1.5
0.75
0.375
0.1875
15
14
13
12
11
10
9
Multiplier →
1
0 ?
1
2
3
4
5
M
?
G
G
G
G
G
-6
0 -7
-8
-9
-10
-11
-12
0.09375
0.04688
0.02344
0.01172
0.00586
0.00293
0.00146
8
7
6
5
4
3
8(S)
7
6
5
4
3
= 1(S)
= 0 ?
=1
=2
=3
=4
0.
x
x
x
x
12(S)
11
10
9
8
7
12(S)
11
10
9
8
7
=1
= 0 ?
=1
=2
=3
=4
1
0 ?
1
2
3
4
6
G
G
G
G
G
G
-13
-14
-15
-16
-17
-18
0.000732
0.000366
0.000183
0.0000916
0.0000458
0.0000229
2
1
2
1
=5
=6
6
5
6
5
=5
=6
5
6
-19
-20
0.0000114
0.00000572
0
0
=7
4
-21
0.00000286
3
2
1
0
AGC Response MAX = Input (Cartesian to Polar Converter Gain)(Error Detector Gain)(AGC Loop Gain)(AGC Output Weighting)
AGC Response MAX = ± 1 ( 0.5 ) ( 0.5 ) ( 2
– 7
) ( 24 ) = ± 1 ( 2
– 9
) ( 24 ) = 0.04688dB ? symbol time
(EQ. 10)
where (0.5) is the MSB of the 0.81 scaling in the Cartesian-to-Polar Coordinate Converter, (0.5) is the MSB of the mantissa of the
Loop Gain, (2 -7 ) is the maximum shift gain, and 24 is the maximum loop filter gain.
A similar procedure is used to calculate the minimum AGC response rate.
AGC Response MIN = ± 1 ( 0.5 ) ( 0.5 ) ( 2
– 14
) ( 24 ) = ± 1 ( 2
– 16
) ( 24 ) = 0.000366dB ? symbol time
(EQ. 11)
Thus, the expected range for the AGC rate is approximately 0.0004 to 0.0469dB/symbol time.
14
FN3652.5
July 2, 2008
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