參數(shù)資料
型號： HSP50210
廠商： HARRIS SEMICONDUCTOR
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Digital Costas Loop(數(shù)字Costas鎖相環(huán))
中文描述： SPECIALTY TELECOM CIRCUIT, PQCC84
文件頁數(shù)： 13/49頁
文件大?。?/td> 340K
代理商： HSP50210
3-13
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 and provided in detail in Equations 9A and 9B.
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
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
Thus, the expected range for the AGC rate is approximately 0.0004 to 0.0469dB/symbol time.
TABLE 6. AGC BIT WEIGHTING
AGC
ACCUM
BIT
POSITION
GAIN
ERROR
INPUT
GAIN
ERROR
BIT
WEIGHT
AGC LOOP
FILTER GAIN
(MANTISSA)
AGC LOOP
FILTER
GAIN
MULTIPLIER
(OUTPUT)
AGC
LOOP
FILTER
GAIN BITS
KEPT
(rnd)
SHIFT
= 0
SHIFT
= 7
AGC
OUTPUT
AND AGC
LIMITS BIT
WEIGHT
AGC GAIN
RESOLUTION
(dB)
22
Shifter
→
E
Shifter
→
E
1
12
21
0
6
20
Multiplier
→
M
-1
3
19
M
-2
1.5
18
M
-3
0.75
17
M
-4
0.375
16
M
-5
0.1875
15
Multiplier
→
1
M
-6
0.09375
14
13
1
G
-8
0.02344
12
2
G
-9
0.01172
11
3
G
-10
0.00586
10
4
G
-11
0.00293
9
5
G
-12
0.00146
8
8(S)
= 1(S)
0.
12(S)
12(S)
= 1
1
6
G
-13
0.000732
7
7
= 0
x
11
11
= 0
6
6
= 1
x
10
10
= 1
1
G
-15
0.000183
5
5
= 2
x
9
9
= 2
2
G
-16
0.0000916
4
4
= 3
x
8
8
= 3
3
G
-17
0.0000458
3
3
= 4
7
7
= 4
4
G
-18
0.0000229
2
2
= 5
6
6
= 5
5
-19
0.0000114
1
1
= 6
5
5
= 6
6
-20
0.00000572
0
0
= 7
4
-21
0.00000286
3
2
1
0
0
0-7
0.04688
0
G
-14
0.000366
(EQ. 9A)
(EQ. 9B)
HSP50210
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