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AGC
GAIN
ACCUM
GAIN
ERROR
BIT
ERROR
BIT
POSITION
INPUT
WEIGHT
31
30
29
28
27
12
= 2
26
11
= 1
25
10
= 0.
24
9
= 1
23
8
= 2
22
7
= 3
21
6
= 4
20
5
= 5
19
4
= 6
18
3
= 7
17
2
= 8
16
1
= 9
15
0
= 10
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AGC Response
= Input(Cart/PolarGain)(Error Det Gain)(AGC Loop Gain
Max
(
) 1.64676
(
AGC Response
=
2
Max
(
) 1.64676
(
AGC Response
=
2
Min
Thus, the expected range for the AGC rate is ~ 0.000106 to 3.275dB/output sample time.
3-26
HSP50214B
TABLE 9A. BIT WEIGHTING FOR AGC LOOP FEEDBACK PATH
AGC LOOP
FILTER
AGC LOOP
GAIN
FILTER GAIN
MULTIPLIER
(MANTISSA)
(OUTPUT)
2
1
0.
0.
x
1
x
2
x
3
x
4
5
6
7
8
9
10
11
12
13
14
1 ( ) 1.5dB
15
)
(
) 3.275dB/output sample time
∼
----- -
16
15
–
) 2
(
) 1 ( ) 1.5dB
(
) 0.000106dB/output sample time
∼
SHIFT
SHIFT
SHIFT
= 0
= 4
= 8
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
2
2
0.
2
2
1
2
2
2
2
1
3
2
0.
4
2
1
5
2
2
6
1
3
7
0.
4
8
1
5
9
2
6
10
3
7
11
4
8
12
5
9
13
6
10
14
7
11
G
8
12
G
9
13
G
10
14
G
)(AGC Output Weighting).
Max
.
.
AGC
OUTPUT
AND AGC
AGC GAIN
SHIFT
LIMITS BIT
RESOLUTION
= 15
WEIGHT
(dB)
2
0
2
E
3
2
E
2
2
E
1
2
E
0
1
M
-1
0.
M
-2
1.5
1
M
-3
0.75
2
M
-4
0.375
3
M
-5
0.1875
4
M
-6
0.09375
5
M
-7
0.04688
6
X
-8
0.02344
7
-9
0.01172
8
-10
0.00586
9
-11
0.00293
10
-12
0.00146
11
-13
0.000732
12
-14
0.000366
13
-15
0.000183
14
-16
0.0000916
G
-17
0.0000458
G
-18
0.0000229
G
-19
0.0000114
G
-20
0.00000572
G
-21
0.00000286
G
G
G
G
G
G
G = ground = 0.
48
24
12
6
3
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