參數(shù)資料
型號(hào)： ISL5217EVAL1
廠商： Intersil Corporation
英文描述： Quad Programmable Up Converter
中文描述： 四可編程轉(zhuǎn)換器
文件頁(yè)數(shù)： 13/43頁(yè)
文件大小： 766K
代理商： ISL5217EVAL1
13
the symbol rate. This would clear the NCO accumulator
every 3 seconds or at a 1/3 Hz rate. The frequency of the
FID carryout can range from Fclk to Fclk/2^32. The value of
FID is determined from:
FID (31:0) = [(fclk / fco)]
Where fco is the desired frequency of the carryout, which in
the previous example is 1/3 Hz and the fclk is and integer
multiple of the sample frequency, say 65MHz. The resultant
value for the FID would be (65MHz/1/3Hz) or 195e6. The
programmed integer values for the FID are loaded 16 bits at
a time into Control Words 2 and 3.
0x2, bits 15:0 = FID (31:16)
0x3, bits 15:0 = FID (15:0)
Loading 195e6 into the FID would result in 0x2, being
0x0b9f, and 0x3 being 0x76c0.
Fixed Coefficient 11-TAP Interpolating
Half-band
Following the post-FIR gain profile block is a fixed coefficient
11-tap interpolate by 2 Half-Band filter. The default mode is
to bypass the filter with the setting of control word 0x0d, bit 9
enabling the filter. If bypassed, the data to the filter is zeroed
which reduces power consumption. The halfband filter
coefficients are:
3, 0, -25, 0, 150, 256, 150, 0, -25, 0, 3
The output of this filter is rounded to 20-bits. The output is
checked for saturation and limited if necessary. The data
exits the halfband filter as a parallel I<20:0> and Q<20:0>
data stream at the rate of fs*IP*2. Figure 12 shows the
frequency response of the Half-Band filter.
Interpolation Filter
The shaped sample data is input to the interpolating filter at
the interpolation rate. The Interpolator filter resamples the
shaped I and Q data to establish the final output sample rate
of the channel. The output sample rate is always the clock
rate. The Interpolator uses the fine phase values from the
Symbol Rate NCO to compute the fine interpolated samples
at the clock rate. The number of interpolated samples is set
by the following ratio: n
IS
= f
CLK
/ f
S
/ IP.
The nulls in the interpolation filter frequency response align
with the interpolation images of the shaping filter. The
impulse response of the Interpolation filter is shown in
Figures 13A through 13C for varying interpolation ratios.
12
46
48
SYNCIN
WR CW3
SAMPLE FREQUENCY
ZERO
2
SHIFTER
IP(1:0)
FINE
PHASE
COARSE
PHASE
SAMPCK
(MSB)
SYNCSEL
EN
ALL REGISTERS ARE
CLOCKED AT CLK
4, 3, OR 2
∑
REG
>
REG
>
REG
<
0
M
EnNCO
(CARRIER NCO)
ACC
START
EDGE
GEN
RESET
EDGE
GEN
WR CW21
RST
R
E
G
>
R
E
G
>
FIGURE 11. RE-SAMPLING NCO BLOCK DIAGRAM
FIGURE 13A. INTERPOLATION FILTER IMPULSE RESPONSE
L = 16; FOUT = 4096
0
0.1
NORMALIZED FREQUENCY (NYQUIST=1)
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
-140
-120
-100
-80
-60
-40
-20
0
M
FIGURE 12. HALF BAND FILTER RESPONSE
0
-20
-40
-60
-80
-100
-120
M
512
1024
1536
SAMPLE TIMES
2048
2560
3072
3584
4096
INTERPOLATION FILTER RESPONSE
ISL5217
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參數(shù)描述
ISL5217KI 功能描述:上下轉(zhuǎn)換器 196BGA,-40+85C PROGRAMMABLE QUAD UP CONVERTER RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128
ISL5217KIZ 制造商:Intersil Corporation 功能描述:UP/DOWN CONV MIXER 2.5V 196BGA - Trays 制造商:Intersil 功能描述:W/ANNEAL 196BGA -40+ 85C PROG CONVER
ISL5239 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Pre-Distortion Linearizer
ISL5239EVAL1 功能描述:EVALUATION BOARD FOR ISL5239 RoHS:是 類別:RF/IF 和 RFID >> RF 評(píng)估和開(kāi)發(fā)套件，板 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:GPS 接收器 頻率:1575MHz 適用于相關(guān)產(chǎn)品:- 已供物品:模塊 其它名稱:SER3796
ISL5239KI 功能描述:音頻 DSP PA LINEARIZER IND TEMP 1 0MM PITCH RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風(fēng)格: 封裝 / 箱體: 封裝:Tube
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