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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 14/43頁 |
| 文件大小： | 766K |
| 代理商： | ISL5217EVAL1 |
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14
Carrier NCO
Following the interpolating filter section, the samples are
modulated onto a carrier signal via a complex multiply
operation. The Carrier NCO provides the quadrature local
oscillator references to the complex mixer.
The NCO has provisions for programming the frequency and
phase offset. The NCO has a 32 bit frequency control
providing sub-hertz resolution at the maximum clock rate.
The carrier NCO phase accumulator feedback can be preset
to synchronize multiple channels. The carrier NCO has a
32-bit 2’s complement programmable frequency increment
value which can range from -2
31
to ~2
31
for a NCO output
range of -f
CLK
/2 to
~
f
CLK
/2. For f
CLK
= 104MHz, the
frequency will range from -52MHz to +52MHz.
The maximum error is 104MHz/(2
32
) = 0.0242Hz. The
carrier frequency can be calculated from the value loaded
into Control Address 0x8 and 0x9 by:
where CR(31:0) is the 32-bit frequency control word which
can range from -2
31
to ~2
31
for a NCO output range of
-f
CLK
/2 to
~
f
CLK
/2. f
CLK
is the CLK frequency.
This NCO frequency range allows for spectral inversion.
Given a desired carrier frequency, the value for CR(31:0)
loaded into the part can be calculated by:
where INT[X] is the integer part of the real number X.
The vector rotation can also be controlled by the sign of the
CF value. When CF is a positive value a counterclockwise
vector rotation is produced. When CF is a negative value a
clockwise vector rotation is produced.
The carrier frequency is loaded 16 bits at a time into Control
Words 8 and 9.
0x8, bits 15:0 = CF (31:16)
0x9, bits 15:0 = CF (15:0)
The 16-bit carrier phase offset initializes the most-significant
16-bits of the phase accumulator. The least significant 16
bits of the phase accumulator are cleared. Given a desired
carrier phase offset, the value CO(31:0) can be calculated by
the following equation.
The carrier phase offset is loaded into Control Word 0x7.
Control Word 7 (15:0) = CO (31:16).
Complex Mixer
The complex mixer multiplies the sin/cos terms generated by
the carrier NCO sin/cos generator with the I and Q
interpolated sample data. The mixers can be bypassed by
programming the carrier frequency to zero. This action sets
the sin/cos terms generated by the carrier NCO to 0 and 1
respectively. The block diagram of the Carrier NCO/Complex
Mixer is shown in Figure 14.
FIGURE 13B. INTERPOLATION FILTER IMPULSE RESPONSE
L = 16; FOUT = 4096
FIGURE 13C. INTERPOLATION FILTER IMPULSE RESPONSE
L = 16; FOUT = 4096
0
-20
-40
-60
-80
-100
-120
M
64
128
192
SAMPLE TIMES
256
320
384
448
512
INTERPOLATION FILTER RESPONSE
0
-0.05
-0.1
-0.15
-0.2
-0.25
-0.3
-0.35
-0.4
-0.45
-0.5
-0.55
-0.6
-0.65
-0.7
M
8
16
24
SAMPLE TIMES
32
40
48
56
64
INTERPOLATION FILTER RESPONSE
F
CARRIER
CR 31:0
)
f
CLK
2
32
–
×
×
=
(EQ. 5)
CR 31:0
(
)
INT F
C
f
CLK
*2
32
]
[
=
(EQ. 6)
CO 31:0
)
INT
--------------------------------------------
*2
32
]
)°
=
(EQ. 7)
FIGURE 14. VECTOR MODULATOR/MIXER BLOCK DIAGRAM
Q(20:0)
SIN
I(20:0)
EN OUT
COS
Im (20:0)
19
19
∑
+
+
I(20:0)
SIN
Q(20:0)
EN OUT
COS
Re (20:0)
19
19
∑
+
-
ISL5217
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相關(guān)代理商/技術(shù)參數(shù) |
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 評估和開發(fā)套件，板 系列:- 標準包裝: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: 安裝風格: 封裝 / 箱體: 封裝:Tube |
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