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参数资料
| 型号： | HSP50216KIZ |
| 厂商： | Intersil |
| 文件页数： | 10/58页 |
| 文件大小： | 0K |
| 描述： | IC DOWNCONVERTER DGTL 4CH 196BGA |
| 标准包装： | 1 |
| 功能： | 降频器 |
| RF 型： | W-CDMA |
| 封装/外壳： | 196-LFBGA |
| 包装： | 托盘 |
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HSP50216
? sin ( π Mf ) ?
? sin ? π ----- f ? ?
CIC Filter
Next, the signal is filtered by a cascaded integrator/comb
(CIC) filter. A CIC filter is an efficient architecture for
decimation filtering. The power or magnitude squared
frequency response of the CIC filter is given by:
? ? 2N
P ( f ) = ? ------------------------ ?
? ? R ? ?
The CIC filter order is programmable from 0 to 5. The
minimum decimation is 4. If the order is set to 0, there must
be at least 4 clocks between samples or the decimation
counter must be set to 4 to chose every 4th sample.
The integrator bit widths are 69, 62, 53, 44, and 34 for the 1 st
through 5 th stages, respectively, while the comb bit widths
are all 32. The integrators are sized for decimation factors of
up to 512 with 5 stages, 2048 with 4 stages, 32768 with 3
stages, and 65536 with 1 or 2 stages. Higher decimations in
the CIC should be avoided as they will cause integrator
where
M = Number of delays (1 for the HSP50216)
overflow. In the HSP50216, the integrators are slightly
oversized to reduce the quantization noise at each stage.
N = Number of stages
and R = Decimation factor.
The passband frequency response for 1 st (N = 1) though 5 th
(N=5) order CIC filters is plotted in Figure 8. The frequency
axis is normalized to f S /R, making f S /R = 1 the CIC output
sample rate. Figure 10 shows the frequency response for a
5 th order filter but extends the frequency axis to f S /R = 3 (3
times the CIC output sample rate) to show alias rejection for
the out of band signals. Figure 9 uses information from
Figure 10 to provide the amplitude of the first (strongest)
alias as a function of the signal frequency or bandwidth from
DC. For example, with a 5 th order CIC and f S /R = 0.125
(signal frequency is 1/8 the CIC output rate) Figure 9 shows
a first alias level of about -87dB. Figure 9 is also listed in
table form in Table 47.
10
FN4557.6
August 17, 2007
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相关代理商/技术参数 |
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