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参数资料
| 型号： | ISL5239 |
| 厂商： | Intersil Corporation |
| 英文描述： | Pre-Distortion Linearizer |
| 中文描述： | 预失真线性化电路 |
| 文件页数： | 7/31页 |
| 文件大小： | 653K |
| 代理商： | ISL5239 |
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7
Pre-Distorter (PD)
The function of the Pre-distorter is to compute the
magnitude of the input signal, look up a complex distortion
vector based on the magnitude, and apply that distortion to
the input signal.
The signal magnitude may be computed by any of three
different methods: log of power, linear magnitude or linear
power. The result is scaled and offset by programmable
amounts and becomes the address into a Look-up Table
(LUT).
Two LUTs are available, one of which is ‘live’ in the circuit
and the other is offline and can be loaded via the processor
interface. This configuration allows instantaneous switching
of pre-distortion characteristics without unpredictable
effects on the processed signal.
The LUTs contain a complex distortion vector, as well as
complex delta values which interact with an external
Thermal/Memory calculation circuit to predict the effects of
temperature changes on the RF amplifier’s behavior and
compensate. The average power into the amplifier is
computed and transmitted serially off chip. The external
circuits compute one or two memory effect coefficients
which are combined with the complex delta values in the
LUT to derive the final distortion vector. The distortion
vector is a rectangular complex value which is multiplied
with the input signal resulting in a magnitude based non-
linearity. Access to the LUT is optimized by the use of an
auto incrementing address register which allows the tables
to be updated with only one address register write
operation. Control words 0x10 through 0x1d apply to the
FIGURE 3A. X4, HB1 AND HB2 ENABLED FREQUENCY
RESPONSE
FIGURE 3B. X8, HB1-HB3 ENABLED FREQUENCY RESPONSE
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
HALFBAND FILTER 2 RESPONSE
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
HALFBAND FILTER 3 RESPONSE
ISL5239
相关PDF资料 |
PDF描述 |
|---|---|
| ISL5239KI | Pre-Distortion Linearizer |
| ISL5239KIZ | Pre-Distortion Linearizer |
| ISL5416 | Four-Channel Wideband Programmable DownConverter |
| ISL5416EVAL | Four-Channel Wideband Programmable DownConverter |
| ISL5416KI | Four-Channel Wideband Programmable DownConverter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL5239EVAL1 | 功能描述:EVALUATION BOARD FOR ISL5239 RoHS:是 类别:RF/IF 和 RFID >> RF 评估和开发套件，板 系列:- 标准包装:1 系列:- 类型:GPS 接收器 频率:1575MHz 适用于相关产品:- 已供物品:模块 其它名称:SER3796 |
| ISL5239KI | 功能描述:音频 DSP PA LINEARIZER IND TEMP 1 0MM PITCH RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| ISL5239KIZ | 功能描述:音频 DSP PA LINEARIZER IND 0MM PITCH BGA PACKAG RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| ISL5314 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Direct Digital Synthesizer |
| ISL5314_05 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Direct Digital Synthesizer |
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