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參數(shù)資料
| 型號： | HSP50016GC-52 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 數(shù)字信號處理外設 |
| 英文描述： | Digital Down Converter |
| 中文描述： | DSP-MIXER, CPGA48 |
| 封裝： | CERAMIC, PGA-48 |
| 文件頁數(shù)： | 10/31頁 |
| 文件大小： | 209K |
| 代理商： | HSP50016GC-52 |
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3-207
Scaling Multipliers
The output of each HDF is passed to a Scaling Multiplier.
The Scaling Multipliers are used to compensate for the HDF
gain, which is between 1 (inclusive) and 0.5 (non-inclusive),
or (0.5, 1.0). The gain through the HDF is dependent on the
decimation factor: when the decimation is an even power of
two, the HDF gain is equal to 1; otherwise, the gain must be
compensated for in the Scaling Multiplier. The HDF gain is
given by the equation:
where R is the HDF decimation factor. The compensating
Scale Factor, which is input to both Scaling Multipliers, is
given by the equation:
where R is the HDF decimation factor.
NOTE: The Scale Factor falls in the interval [1, 2).
The
output of the scaling multiplier is symmetrically rounded to
17 bits.
The binary formats of the inputs and outputs of the scaling
multiplier are as follows:
Input from HDF:
Scale factor:
Output:
a
0
(-2
0
). a
1
(2
-1
) a
2
(2
-2
)... a
17
(2
-17
)
a
0
(2
0
). a
1
(2
-1
) a
2
(2
-2
)... a
15
(2
-15
)
a
0
(-2
0
). a
1
(2
-1
) a
2
(2
-2
)... a
16
(2
-16
)
FIR Filter
The Scaling Multiplier output is passed to the FIR Filter,
which performs aliasing attenuation, passband roll off
compensation and transition band shaping. The FIR Filter
Section is functionally two identical 121 tap lowpass FIR
filters, one each for the I and Q channel. The two filters are
each implemented as sum of products, each with a single
multiplier, with the coefficients stored in ROM. The filters'
passbands are precompensated to be the inverse of the
response of the HDF. The frequency responses of the HDF,
FIR, and Composite HDF/FIR filters are shown in Figure 8.
The composite passband of the HDF and FIR filter
frequency response is shown in Figure 9. The FIR
coefficients are scaled so that the maximum gain of the
composite filter is less than or equal to 0dB. The composite
passband ripple is less than 0.04dB.
HDF Gain
R
5
/2
CEILING 5 log2R
)
=
(EQ. 8)
(EQ. 9)
Scale Factor
2
CEILING 5 log2R
(
)
R
5
=
FIGURE 8A. DDC HDF, FIR, AND COMPOSITE FILTER
RESPONSE (FOR R = 16)
FIGURE 8B. DDC FILTER RESPONSES (FOR R = 16)
-100
-150
-50
0
M
f
S
4
f
S
2
3f
S
4
f
S
-100
-150
-50
0
M
f
S
4
f
S
2
3f
S
4
f
S
-100
-150
-50
0
M
f
S
4
f
S
2
3f
S
4
f
S
SAMPLE TIMES
HDF
FIR
COMPOSITE
(R = 16)
M
0
-120
SAMPLE TIMES
f
S
8R
3f
S
32R
f
S
16R
f
S
32R
f
S
64R
f
S
128R
-20
-40
-60
-80
-100
2
4
6
8
10 12 14 16 18 20 22 24 26 28 30 32
COMPOSITE
HDF/FIR
HDF
FIR
HSP50016
相關PDF資料 |
PDF描述 |
|---|---|
| HSP50016-EV | DDC Evaluation Platform |
| HSP50016JC-52 | Digital Down Converter |
| HSP50016JC-75 | Digital Down Converter |
| HSP50110JC-60 | Communications Tuner Circuit |
| HSP50306SC-25 | Digital QPSK Demodulator |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HSP50016JC-52 | 功能描述:上下轉換器 DIGITAL DOWN CONVERTER 44 PLCC, 52MHZ, COMM 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 |
| HSP50016JC-5296 | 制造商:Rochester Electronics LLC 功能描述:TAPE AND REEL OF HSP50016JC-52 - Bulk |
| HSP50016JC-75 | 制造商:Rochester Electronics LLC 功能描述:DIGITAL DOWN CONVERTER 44 PLCC 75MHZ COMM - Bulk |
| HSP50016JI-52 | 制造商:Rochester Electronics LLC 功能描述:DIGITAL DOWN CONVERTER 44 PLCC, 52MHZ, COMM,INDS - Bulk |
| HSP50016JM-5296R3571 | 制造商:Intersil Corporation 功能描述:ROCKWELL HSP50016JC-5296 W/BRAND,-55/+125C OP TEMP,ELECTR - Tape and Reel |
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