參數(shù)資料
型號： HSP50214A
廠商： Intersil Corporation
英文描述： Programmable Downconverter
中文描述： 可編程變頻器
文件頁數(shù)： 20/60頁
文件大?。?/td> 467K
代理商： HSP50214A
20
The Cartesian to Polar Coordinate converter accepts I and Q
data and generates magnitude and phase data. The magni-
tude output is determined by the equation:
where the magnitude limits are determined by the maximum
I and Q signal levels into the Cartesian to Polar converter.
Taking fractional 2’s complement representation, magnitude
ranges from 0 to 2.329, where the maximum output is
)
2
1.0
(
+
=
1.64676
=
.
The AGC loop feedback path consists of an error detector,
error scaling, and an AGC loop filter. The error detector sub-
tracts the magnitude output of the coordinate converter from
the programmable AGC THRESHOLD value. The bit weight-
ing of the AGC THRESHOLD value (Control Word 8, Bits 16-
28) is shown in Table 5. Note that the MSB is always zero.
The range of the AGC THRESHOLD value is 0 to 7.9995.
The AGC Error Detector output has the identical range.
TABLE 5. AGC THRESHOLD (CONTROL WORD 8) BIT
WEIGHTING
28
27
26
25
24
23
22
The loop gain is set in the AGC Error Scaling circuitry, using
the two programmable mantissas and exponents. The man-
tissa, M, is a 4-bit value which weights the loop filter input
from 0.0 to 0.9375. The exponent, E, defines a shift factor
that provides additional weighting from 2
0
to 2
-15
. Together
the mantissa and exponent define the loop gain as given by,
where M
LG
is a 4-bit binary value ranging from 0 to 15, and
E
LG
is a 4-bit binary value ranging from 0 to 15. Table 7 and
8 detail the binary values and th
e
resulting scaling effects of
the AGC scaling mantissa and exponent. The composite
(shifter and multiplier) AGC scaling Gain range is from
0.0000 to 2.329(0.9375)
2
0
= 0.0000 to 2.18344. The scaled
gain error can range (depending on threshold) from 0 to
2.18344, which maps to a “gain change per sample” range
of 0 to 3.275dB/sample.
The AGC Gain mantissa and exponent values are pro-
grammed into Control Word 8, Bits 0-15. The PDC provides
for the storing of two values of AGC Scaling Gain (both expo-
nent and mantissa). This allows for quick adjustment of the
loop gain by simply asserting the external control line
AGCGNSEL. When AGCGNSEL = 0, then AGC GAIN 0 is
selected, and when AGCGNSEL = 1, AGC Loop Gain 1 is
selected. Possible applications include acquisition/tracking,
no burst present/burst present, strong signal/weak signal,
track/hold, or fast/slow AGC values.
The AGC loop filter consists of an accumulator with a built in
limiting function. The maximum and minimum AGC gain lim-
its are provided to keep the gain within a specified range and
are programed by 12-bit Control Words using the following
the equation:
where m is an 8-bit mantissa value between 0 and 511, and e
is the 4-bit exponent ranging from 0 to 15. Control Word 9,
Bits 16-27 are used for programming the upper limit, while bits
0-11 are used to program the lower threshold. The ranges and
format for these limit values are shown in Tables 6A - C. The
bit weightings for the AGC Loop Feedback elements are
detailed in Table 9.
FIGURE 21. AGC MULTIPLIER LINEAR AND dB TRANSFER
FUNCTION
6
5
4
3
2
1
0
0
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
AGC CONTROL MANTISSA VALUES (TIMES 256)
G
G (dB)
G (LINEAR)
FIGURE 22. AGC GAIN CONTROL TRANSFER FUNCTION
100
90
80
70
60
50
40
30
20
10
0
0
64
128
192
AGC CONTROL WORD (MANTISSA x 256)
G
N = 15
N = 14
N = 13
N = 12
N = 11
N = 10
N = 9
N = 8
N = 7
N = 6
N = 5
N = 4
N = 3
N = 2
N = 1
N = 0
(EQ. 15)
r
1.64676 I
2
Q
2
˙
+
.
=
r
1.64676
1.0
(
)
2
˙
1.414
×
2.329
=
21
20
19
18
17
16
2
2
2
1
2
0
.
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
2
-9
2
-10
(EQ. 16)
AGC Loop Gain
M
LG
2
4
–
2
15
ELG
–
(
)
–
=
(EQ. 17)
AGC Gain Limit
1
m
AGC
2
9
–
+
(
)
2
e
=
AGC Gain Limit
(
)
dB = 6.02
)
eeee
(
)
20
1.0
0.eeeeeeee
(EQ. 17A)
+
(
)
log
+
HSP50214A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HSP50214AVC 制造商:Rochester Electronics LLC 功能描述:- Bulk
HSP50214AVI 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable Downconverter
HSP50214B 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable Downconverter
HSP50214B_07 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Programmable Downconverter
HSP50214BVC 功能描述:上下轉(zhuǎn)換器 120L MQFP COMTEMP 14-BIT PROGRAMMABLE DOWNCONVERTER 65MSPS RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PQFP-128
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