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参数资料
| 型号： | HSP50415VIZ |
| 厂商： | Intersil |
| 文件页数： | 11/29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
resulting 23-bit output rounded at bit position 5 (multOut<5>)
to 17-bits. The extra bit is carried to check for overflow at the
output of the shifter. The output of the multiplier
(multOut<22:6>) is then shifted to the appropriate position
per the exponent bits with a shift value of 0xB positioning the
data at the top of the shifter. The final shifted output is then
checked for saturation and limited to 16-bits before being
output.
Fixed Coefficient 19-TAP Interpolating
Halfband
100
80
60
40
20
0
-20
-40
-60
Following the post-FIR gain stage is a pair of fixed coefficient
19-tap interpolate by 2 halfband filters. The halfband filter
-80
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
may be totally bypassed if not required. If bypassed, the data
to the filter is zeroed which reduces power consumption. The
halfband filter coefficients are:
1, 0, -17, 0, 87, 0, -299, 0, 1252, 2048, 1252, 0, -299, 0, 87,
0, -17, 0, 1
The interpolate by 2 is accomplished via zero-stuffing and
low-pass filtering. The output of this filter is rounded to 16-
bits. The output is checked for saturation and limited if
necessary. The data exits the halfband filters as a parallel
I<15:0> and Q<15:0> data stream at the interpolated sample
rate. Figure 8 shows the frequency response of the Half-Band
filter.
11
NORMALIZED FREQUENCY (NYQUIST = 1)
FIGURE 8. HALF-BAND FREQUENCY RESPONSE
Interpolating Filter
Following the halfband stage, the data enters the last stage
of interpolating filters. Again, the I and Q filters are identical
so the subsequent discussion will refer to a single channel.
The data is input to the interpolating filter at this stage’s input
sample rate which is dependent on the previous stage’s
interpolation rate. At this stage the input sample rate clock is
generated by the SYMBOL NCO. For every output sample
generated, there is a 12-bit phase value that is also
generated in the SYMBOL NCO (the top 12-bits of the phase
accumulator). The Interpolator uses this phase value to
compute output samples at the output sample rate (FSOUT)
which is the final output sample rate of the chip. The nulls in
the interpolation filter frequency response align with the
interpolation images of the shaping filter. Input to this stage
should be no greater than -2dB fullscale to prevent overflow.
The impulse response of the Interpolation filter is shown in
Figures 9 through 11 for an interpolate by 16 filter (the
interpolation ratio, L, is equal to 16). This block may be
bypassed if desired. Figures 12 through 17 depict the
response for varying interpolation ratios.
FN4559.6
April 23, 2007
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相关代理商/技术参数 |
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| HSP50A | 制造商:JLWORLD 制造商全称:JLWORLD 功能描述:SPEAKER SOUND GENERATORS |
| HSP50B | 制造商:JLWORLD 制造商全称:JLWORLD 功能描述:SPEAKER SOUND GENERATORS |
| HSP50SA8 | 制造商:RDI 功能描述:SPEAKER 2 ROUND 8 OHMS CLEAR FACE |
| HSP-50SA-8 | 制造商:RDI 功能描述:SPEAKER 2 ROUND 8 OHMS CLEAR FACE |
| HSP-6 | 制造商:Crydom 功能描述:Thrml Mgmt Access Thermal Pad Black 1.49°C.cm2/W 2W/m.K 10Xe2Ohm.cm 制造商:Crydom 功能描述:HSP-6/Thrml Pad for EL Series SSR Non-Adhsve / ROHS: Y |
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