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參數(shù)資料
| 型號： | ISL5217 |
| 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)： | 9/43頁 |
| 文件大?。?/td> | 766K |
| 代理商： | ISL5217 |
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9
Modulation Mode 00 - QASK
This modulation mode configures the QPUC as a BPSK,
QPSK, OQPSK, MSK or m-QAM modulator. The block
diagram is shown in Figure 7. The data FIFO outputs are
routed to the shaping filters. Here the samples are
interpolated by 4, 8, or 16 and shaped using a FIR filter with
up to a 256 taps. The filter impulse response can span 4-16
input samples. A half (input) sample delay can be inserted in
the I/Q path after the FIR and is enabled through Main
Control (0xc, bit 13). The 20-bit output of the shaping filter is
routed through a gain adjust multiplier controlled by 0x0a,
bits 11:0 and into the interpolation filter. The interpolation
filter interpolates by a factor set in the resampling NCO with
the Interpolation Phases controlled by 0xd, bits 1:0. The
output of the interpolation filter is at the master clock
frequency, CLK. The samples are then mixed with the carrier
L.O. for quadrature upconversion. The output is then
summed with the cascade input signal, saturated (in the
case of overflow), and formatted for output.
Modulation Mode 01 - FM with Bandlimiting Filter
This mode configures the QPUC as an FM modulator with
post-modulation filtering. The block diagram is shown in
Figure 8. This mode provides for FSK and FM modulation
schemes. In this mode, the I input samples drive the
frequency control section of a quadrature NCO to produce a
zero IF FM signal. The 16-bit FM quadrature signals are then
routed to the shaping FIR filter and into the interpolation filter
for bandlimiting and interpolation up to the master clock rate.
The quadrature filtered FM signals are then upconverted to
the carrier frequency by the carrier NCO and mixers. The
output is then summed with the cascade input signal,
saturated (in the case of overflow), and formatted for output.
Note that pulse shaping in this mode must be provided prior
to the QPUC.
Modulation Mode 10 - FM with Pulse Shaping
This mode configures the QPUC as a FM modulator with
pre-modulation baseband pulse shaping. The block diagram
is shown in Figure 9. The data from the FIFO (I channel only)
is routed to the FIR shaping filter. The FIR shaping filter
output drives the frequency control section of a quadrature
NCO to produce a zero IF FM signal. These 18-bit FM
modulated quadrature samples are then up sampled in the
interpolation filter to the output sample rate. The baseband
modulated signal is then upconverted to the carrier
frequency by the carrier NCO and mixers. The output is then
summed with the cascade input signal, saturated, and
formatted for output.
In Mode 10, the amplitude out of the shaping filter needs to
be limited in order to prevent frequency excursions that
cannot be filtered out in the interpolation filter.
NOTE: THE QUALITY OF THE FM SIGNAL IS AFFECTED BY
THE AMPLITUDE SLEW RATE OUT OF THE SHAPING FILTER.
AS A RULE OF THUMB, LIMITING THIS SLEW RATE TO LESS
THAN 1/8 THE SAMPLE RATE WILL MINIMIZE THIS
DISTORTION.
FM Modulator
The FM modulator provides for frequency modulation of the
carrier center frequency by the QPUC input data. The FM
modulator is driven either directly by the QPUC I input (Mode
01) or by the output of the FIR shaping filter (Mode 10). The
input data to the FM Modulator, is defined as d
φ
(n)/dt, where
φ
(nT) is the phase of a theoretical sinusoid described by:
The block diagram is shown in Figure 10. The input to the
FM modulator, d
φ
(n)/dt, is integrated via the NCO
accumulator. The NCO accumulator output represents
phase and is used to address a SIN/COS generator,
synthesizing a sinusoid of the form described in
Equation 1. The phase accumulator feedback of the NCO is
20 bits and 18 bits of the phase word are routed to the
SIN/COS generator. Eighteen bits of amplitude are
provided on the Sine and Cosine outputs.
The transfer function of the FM modulator is defined by the
change in degrees per sample value, d
φ
(nT)/dt, where
d
φ
(nT)/dt is a 16-bit, twos complement, fractionally notated
frequency control word with a range from -F
SAMP
/2 to
+F
SAMP
/2. F
SAMP
is defined as the sample rate into the FM
GAIN
PROFILE
TO
HALFBAND
SHAPING
FILTER
I
FIGURE 7. QASK
Q
GAIN
PROFILE
T
H
FM
MODULATOR
I
SHAPING
FILTER
FIGURE 8. FM WITH BANDLIMITING
GAIN
PROFILE
T
H
SHAPING
FILTER
I
FIGURE 9. FM WITH PULSE SHAPING
FM
MODULATOR
s n
A (cos
φ
nT
(
)]
+ j sin
φ
nT
(
)
[
]
); A
≈
1 in Modulator
[
=
(EQ. 1)
S
R
MODE
01 OR 10
d
φ
(nT)/dt
φ
(nT)
COS[
φ
(nT)]
FIGURE 10. FM MODULATOR BLOCK DIAGRAM
SIN[
φ
(nT)]
16 or 20
20
18
18
∑
R
E
G
>
FM
ISL5217
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PDF描述 |
|---|---|
| ISL5217KIZ | Quad Programmable Up Converter |
| ISL5314INZ | Direct Digital Synthesizer |
| ISL5314IN | Direct Digital Synthesizer |
| ISL5314 | Direct Digital Synthesizer |
| ISL5314EVAL2 | Direct Digital Synthesizer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL5217_05 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Quad Programmable Up Converter |
| ISL5217EVAL1 | 功能描述:EVALUATION BOARD FOR ISL5217KI 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 |
| 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 |
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