參數(shù)資料
型號(hào)： HSP50110
廠商： Intersil Corporation
英文描述： Digital Quadrature Tuner(數(shù)字調(diào)諧器)
中文描述： 數(shù)字正交調(diào)諧器（數(shù)字調(diào)諧器）
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 207K
代理商： HSP50110
3-8
The Integrate and Dump filter exhibits a frequency response
given by
I
R
where f is normalized frequency relative to the input sample
rate, F
S
, and R is the decimation rate [1]. The decimation
rate is equivalent to the number of samples in the integration
period. As an example, the frequency response for an
integrate and dump filter with decimation of 64 is shown in
Figure 6. The decimation rate is controlled by the
Re-Sampler and may range in value from 2 to 4096 (see
Re-Sampler Section).
For applications requiring better out of band attenuation, the
Third Order CIC filter may be selected. This filter has a
frequency response given by
H(f) = [sin(
π
fR)/sin(
π
f)]
3
[1/R]
3
(EQ. 9)
where f is normalized frequency relative to the input sample
rate, and R is the decimation rate [1]. As with the integrate
and dump filter, the decimation rate is controlled by the Re-
Sampler. The decimation rate may range in value from
2-4096 when using CLK, or 3-4096 when using the Re-
Sampler NCO as a CLK source to the filter. The frequency
response for the third order CIC with a decimation rate of 64
is shown in Figure 7.
Compensation filters may be activated to flatten the frequency
responses of the integrate and dump and third order CIC
filters. The compensation filters operate at the decimated data
rate, and flatten the roll off the decimating filters from DC to
approximately one half of the output sample rate. Together,
the Integrate and Dump filter and x/sin(x) compensation filter
typically yield a lowpass frequency response that is flat to
0.45F
S
with 0.03dB of ripple, and the third order CIC with
((x)/sin(x))
3
compensation typically yields a flat passband to
0.45F
S
with 0.08dB of ripple. The overall passband ripple
degrades slightly for decimation rates of less than 10. Some
examples of compensation filter performance for the Integrate
and dump and third order CIC filter are shown overlaid on the
frequency responses of the uncompensated filters in Figure 6
and Figure 7. The coefficients for the compensation filters are
given in Table 2.
The out of band channels and noise attenuated by the
decimating filters are aliased into the output spectrum as a
result of the decimating process. A summation of the alias
terms at each frequency of the output spectrum produce
alias profiles which can be used to determine the usable
output bandwidth. A set of profiles representative of what
would be observed for decimation factors of ~10 or more are
shown in Figures 8 through 11. The Integrate and Dump
filter is typically used as a matched filter for square pulses
H f
( )
---
π
fR
(
)
/sin(
π
f
)
sin
=
(EQ. 8)
SAMPLE TIMES
M
10
NOTE: Example plotted is for R = 64 with 64 samples/symbol.
FIGURE 6. INTEGRATE AND DUMP FILTER (FIRST ORDER
CIC) FREQUENCY RESPONSE
0
-10
-20
-30
-40
-50
-60
COMPENSATION
FILTER
COMPOSITE FILTER
CIC
FILTER
f
S
2R
f
S
R
3f
S
2R
2f
S
R
5f
S
2R
3f
S
R
7f
S
2R
4f
S
R
TABLE 2. COMPENSATION FILTER COEFFICIENTS
COEFFICIENT INDEX
x/sin(x)
[2]
[x/sin(x)]
3
0
-1
-1
1
2
4
2
-4
-16
3
10
32
4
-34
-64
5
384
136
6
-34
-352
7
10
1312
8
-4
-352
9
2
136
10
-1
-64
11
32
12
-16
13
4
14
-1
SAMPLE TIMES
M
10
NOTE:
Example plotted is for R = 64 with 64 samples/symbol.
FIGURE 7. THIRD ORDER CIC FREQUENCY RESPONSE
0
-10
-20
-30
-40
-50
-60
COMPENSATION
FILTER
CIC
FILTER
COMPOSITE FILTER
f
S
2R
f
S
R
3f
S
2R
2f
S
R
5f
S
2R
3f
S
R
7f
S
2R
4f
S
R
HSP50110
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HSP50110_01 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Digital Quadrature Tuner
HSP50110JC-52 功能描述:調(diào)諧器 DIGITAL QUADRATURE TUNER 84 PLCC,52MHZ,COMM RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
HSP50110JC-52Z 功能描述:調(diào)諧器 W/ANNEAL DIGTL TUNER 84 PLCC 52MHZ RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
HSP50110JC-60 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Communications Tuner Circuit
HSP50110JI-52 功能描述:調(diào)諧器 DIGITAL QUADRATURE TUNER 84 PLCC,52MHZ,INDUSTRIAL RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
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