- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383133 > ISL5217KIZ (INTERSIL CORP) Quad Programmable Up Converter PDF資料下載
參數(shù)資料
| 型號： | ISL5217KIZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Quad Programmable Up Converter |
| 中文描述： | TELECOM, CELLULAR, BASEBAND CIRCUIT, PBGA196 |
| 封裝： | 15 X 15 MM, LEAD FREE, PLASTIC, BGA-196 |
| 文件頁數(shù)： | 9/43頁 |
| 文件大?。?/td> | 797K |
| 代理商： | ISL5217KIZ |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁
9
FN6004.3
July 8, 2005
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
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
相關PDF資料 |
PDF描述 |
|---|---|
| ISL5314INZ | Direct Digital Synthesizer |
| ISL5314IN | Direct Digital Synthesizer |
| ISL5314 | Direct Digital Synthesizer |
| ISL5314EVAL2 | Direct Digital Synthesizer |
| ISL54048 | Ultra Low ON-Resistance, +1.65V to +4.5V, Single Supply, Dual SPST Analog Switch |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ISL5239KIZ | 功能描述:音頻 DSP PA LINEARIZER IND 0MM PITCH BGA PACKAG 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 |
| ISL5314 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Direct Digital Synthesizer |
發(fā)布緊急采購，3分鐘左右您將得到回復。