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參數(shù)資料
| 型號： | HSP50214BVC |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Programmable Downconverter |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQFP120 |
| 文件頁數(shù)： | 30/60頁 |
| 文件大小： | 573K |
| 代理商： | HSP50214BVC |
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3-30
Cartesian to Polar Converter
The Cartesian to Polar converter computes the magnitude
and phase of the I/Q vector. The I and Q inputs are 18 bits.
The converter phase output is 18 bits (truncated) with the 16
MSB’s routed to the output formatter and all 18 bits routed to
the frequency discriminator. The 16-bit output phase can be
interpreted either as two’s complement (-0.5 to
approximately 0.5) or unsigned (0.0 to approximately 1.0),
as shown in Figure 28. The phase conversion gain is 1/2
π
.
The phase resolution is 16 bits. The 16-bit magnitude is
unsigned binary format with a range from 0 to 2.32. The
magnitude conversion gain is 1.64676. The magnitude
resolution is 16 bits. The MSB is always zero.
Table 11 details the phase and magnitude weighting for the
16 bits output from the PDC.
The magnitude and phase computation requires 17 clocks
for full precision. At the end of the 17 clocks, the magnitude
and phase are latched into a register to be held for the next
stage, either the output formatter or frequency discriminator.
If a new input sample arrives before the end of the 17 cycles,
the results of the computations up until that time, are
latched. This latching means that an increase in speed
causes only a decrease in resolution. Table 12 details the
exact resolution that can be obtained with a fixed number of
clock cycles up to the required 17. The input magnitude and
phase errors induced by normal SNR values will almost
always be worse than the Cartesian to Polar conversion.
In the HSP50214, the input to the coordinate converter I/Q to
|r|/
θ)
block is 18 bits. If the signal range is large and the AGC
is not used, the quantization noise can become a
contributing factor in the phase and frequency computations.
For example, if the signal range is 84dB and the maximum
signal is set at full scale, the minimum signal would have
only 4 bits each for I and Q.
In the HSP50214B, an additional data path option was
added that allows the output of the 255 tap programmable
FIR filter to be routed directly to the coordinate converter.
Rather than having to select only 18 bits out of the available
26 bit output, all 26 bits of the FIR output are routed to the
coordinate converter. This change eliminates quantization
effects to give more accuracy in the phase and frequency
discriminator outputs. The AGC settling time is not a factor
because the AGC is effectively bypassed for the magnitude,
phase, and frequency computations.
NOTE: The most significant 18 bits of the computed phase are
still routed to the discriminator.
TABLE 11. MAG/PHASE BIT WEIGHTING
BIT
MAGNITUDE
PHASE (
o
)
15 (MSB)
2
2
(Always 0)
180
14
2
1
90
13
2
0
45
12
2
-1
22.5
11
2
-2
11.25
10
2
-3
5.625
9
2
-4
2.8125
8
2
-5
1.40625
7
2
-6
0.703125
6
2
-7
0.3515625
5
2
-8
0.17578125
4
2
-9
0.087890625
3
2
-10
0.043945312
2
2
-11
0.021972656
1
2
-12
0.010986328
0 (LSB)
2
-13
0.005483164
0
+
π
/2
±
π
8000
-
π
/2
0
ffff
π
/2
π
3
π
/2
0000
7fff
ffff
3fff
Q
c000
0000
4000
bfff
I
I
Q
3fff
4000
7fff
8000
c000
bfff
FIGURE 28. PHASE BIT MAPPING OF COORDINATE
CONVERTER OUTPUT
TABLE 12. MAG/PHASE ACCURACY vs CLOCK CYCLES
CLOCKS
MAGNITUDE
ERROR
(% f
S
)
PHASE
ERROR
(DEG.)
PHASE
ERROR
(% f
S
)
6
0.065
3.5
2
7
0.016
1.8
1
8
0.004
0.9
0.5
9
<0.004
0.45
0.25
10
<0.004
0.22
0.12
11
<0.004
0.11
0.062
12
<0.004
0.056
0.03
13
<0.004
0.028
0.016
14
<0.004
0.014
0.008
15
<0.004
0.007
0.004
16
<0.004
0.0035
0.002
17
<0.004
0.00175
0.001
Assumes
±
180
o
= f
S
.
HSP50214B
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HSP50214BVI | Programmable Downconverter |
| HT84 | ADSL Coupling Transformers |
| HT84-00594 | ADSL Coupling Transformers |
| HT8400594S | ADSL Coupling Transformers |
| HT84-00595 | ADSL Coupling Transformers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HSP50214BVCZ | 功能描述:上下轉(zhuǎn)換器 120L MQFP COMTEMP 14-BIT PROG DWNCNVRT 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50214BVI | 功能描述:上下轉(zhuǎn)換器 120L MQFP INDTEMP 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50214BVIZ | 功能描述:上下轉(zhuǎn)換器 120L MQFP INDTEMP 14-BIT PROG DWNCNVRT 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| HSP50214VC | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HSP50214VI | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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