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参数资料
| 型号： | HSP50415VIZ |
| 厂商： | Intersil |
| 文件页数： | 13/29页 |
| 文件大小： | 0K |
| 描述： | IC MODULATOR PROGRAMABLE 100MQFP |
| 标准包装： | 66 |
| 功能： | 调制器 |
| 封装/外壳： | 100-BQFP |
| 包装： | 托盘 |
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HSP50415
Typical Performance Curves
0
(Continued)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
INTERPOLATION FILTER RESPONSE
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
INTERPOLATION FILTER RESPONSE
-120
0
512
1024
1536
2048
-120
0
512
1024
1536
2048
SAMPLE TIMES
FIGURE 15. RESPONSE FOR L = 6; FOUT = 4096
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
SAMPLE TIMES
FIGURE 16. RESPONSE FOR L = 8; FOUT = 4096
INTERPOLATION FILTER RESPONSE
-120
0
512
1024
1536
2048
SAMPLE TIMES
FIGURE 17. RESPONSE FOR L = 10; FOUT = 4096
Carrier NCO and Complex Mixer
Following the interpolating filter is the complex mixer stage
where the quadrature data is modulated onto a carrier signal
via a complex multiply operation resulting in a quadrature
output sample. The carrier NCO has a 32-bit programmable
frequency increment value which is programmed as follows:
carrierPhinc = (carrierFrequency / FSout) * 2^32
The frequency may be positive or negative with a range from
-50 to +50MHz (for FSout of 100MHz). The phase adder and
accumulator are also 32-bits wide.
13
X/SIN(X) Compensation Filters
Following the complex mixer stage is a pair of fixed
coefficient 11-tap X/SIN(X) compensation filters. The
X/SIN(X) filter performs peaking to compensate for the
SIN(X)/X rolloff that occurs at the output of the DACs. These
filters may be totally bypassed if not required. The X/SIN(X)
filter coefficients are:
-1, 2, -4, 10, -34, 384, -34, 10, -4, 2, -1
The output is rounded to 16-bits. The output of the filter is
not checked for saturation since the maximum sum of
products is 486/512 (0.949) and overflow will never occur.
The data exits the X/SIN(X) filters as a parallel I<15:0> and
Q<15:0> data streams at the final sample rate. Figure 18
plots of the inverse sinc function, sinc function, and the effect
of compensation.
FN4559.6
April 23, 2007
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