Datasheet > QHX220ICT7

QHX220ICT7

更新时间： 2024-01-12 18:38:30

品牌	Logo	应用领域
英特矽尔 - INTERSIL		电信集成电路
页数	文件大小	规格书
19页	1362K
描述
Active Isolation Enhancer and Interference Canceller

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QHX220ICT7 技术参数

QHx220

FIGURE 29. BLOCK DIAGRAM

Operation

The architecture of the QHx220 is similar to that of a

linear vector modulator. A SPI bus interface is used to

control the internal 10-bit DACs, which in turn control

the VGAs in the RF-path. The VGA settings sett the I

and Q of a vector modulator and provide full control

over the magnitude and phase of the output

cancellation signal. The SPI interface is also used to

control internal LNA gain stages at the sampler input,

which can provide additional gain when sampling

weaker noise sources. The QHx220 allows for a full

360° phase control and up to 50 dB of dynamic range

of the input RF signal. This tuning range is used to

emulate the RF noise coupling channel that is present

between the noise source and victim receiver. The

noise coupling channel can be radiated from the noise

source to the victim receive antenna or via some other

leakage path to the receiver - most often it is a

combination of the two.

FIGURE 30. POLAR PLOT

Figure 30 illustrates the gain and phase control

provided by the vector modulator. The coverage map is

represented in polar form.

In practice it is not possible to reach origin at the

minimum gain setting, which represents a gain of zero.

This is due to the isolation limitations that exist in any

device. Thus it is not possible to completely eliminate

that signal in the forward path, resulting in minimum

gain levels in the order of -45dBm or -55dBm.

FN6986.0

October 20, 2009

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