參數資料
型號： CLC5903SM
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 衰減器
英文描述： Dual Digital Tuner / AGC
中文描述： RF/MICROWAVE DOWN CONVERTER
封裝： BGA-128
文件頁數： 16/29頁
文件大?。?/td> 698K
代理商： CLC5903SM
www.national.com
16
C
response through to the second filter. The latter can then be
programmed as a Nyquist (typically a root-raised-cosine) fil-
ter for matched filtering of digital data.
The complete channel filter response for standard coeffi-
cients is shown in Figure 25. Passband flatness is shown in
Figure 26. The complete filter response for GSM coefficients
is shown in Figure 27. GSM Passband flatness is shown in
Figure 28.
The mask shown in Figure 27 is derived from the ETSI GSM
5.05 specifications for a normal Basestation Transceiver
(BTS). For interferers, 9dB was added to the carrier to inter-
ference (C/I) ratios. For blockers, 9dB was added to the dif-
ference between the blocker level and 3dB above the
reference sensitivity level.
Channel Bandwidth vs. Sample Rate
When the CLC5903 is used for GSM systems, a bandwidth
of about 200kHz is desired. With a sample rate of 52MHz,
the total decimation of 192 provides the desired 270.833kHz
output sample rate. This output sample rate in combination
with the FIR filter coefficients create the desired channel
bandwidth. If the sample rate is increased to 65MHz, the
decimation must also be increased to 65MHz/270.833kHz or
240. This new decimation rate will maintain the same output
bandwidth. At 78MHz, the decimation must increase again to
78MHz/270.833kHz or 288. The output bandwidth may only
be changed in relation to the output sample rate by creating
a new set of FIR filter coefficients. As the filter bandwidth
Figure 23. F2 STD frequency response
0
0.1
0.2
0.3
0.4
0.5
100
90
80
70
60
50
40
30
20
10
0
Frequency Response of F2 Using STD Set
M
Frequency Normalized To Filter Input Sample Rate
Figure 24. F2 GSM frequency response
0
0.1
0.2
0.3
0.4
0.5
50
45
40
35
30
25
20
15
10
5
0
5
Frequency Response of F2 Using GSM Set
M
Frequency Normalized To Filter Input Sample Rate
Figure 25. CIC, F1, & F2 STD frequency response
0
500
1000
1500
2000
2500
3000
150
100
50
0
Combined Frequency Response of CIC/F1/F2 Using STD Set
M
Frequency (KHz)
F
= 52MHz
Decimation = 192
O
FS
= 270.83kHz
Figure 26. CIC, F1, & F2 STD Passband Flatness
0
50
100
Frequency (KHz)
150
200
250
0.1
0.08
0.06
0.04
0.02
0
0.02
0.04
0.06
0.08
0.1
Combined Frequency Response of CIC/F1/F2 Using STD Set
M
Figure 27. CIC, F1, & F2 GSM frequency response
0
500
1000
1500
2000
2500
3000
100
80
60
40
20
0
Combined Frequency Response of CIC/F1/F2 Using GSM Set
M
Frequency (KHz)
F
= 52MHz
Decimation = 192
O
FS
= 270.83kHz
Detailed Description
(Continued)
相關PDF資料
PDF描述
CLC5903VLA Dual Digital Tuner / AGC
CLC5955 11-bit, 55MSPS Broadband Monolithic A/D Converter
CLC5955MTDX 11-bit, 55MSPS Broadband Monolithic A/D Converter
CLC5956PCASM 12-bit, 65 MSPS Broadband Monolithic A/D Converter
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相關代理商/技術參數
參數描述
CLC5903SM/NOPB 功能描述:上下轉換器 RoHS:否 制造商:Texas Instruments 產品: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
CLC5903VLA 功能描述:上下轉換器 RoHS:否 制造商:Texas Instruments 產品: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
CLC5903VLA/NOPB 功能描述:上下轉換器 RoHS:否 制造商:Texas Instruments 產品: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
CLC5955 制造商:NSC 制造商全稱:National Semiconductor 功能描述:11-bit, 55MSPS Broadband Monolithic A/D Converter
CLC5955MTD 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
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