QHX220 Ver la hoja de datos (PDF) - Intersil

Número de pieza

componentes Descripción

Fabricante

QHX220

Active Isolation Enhancer and Interference Canceller

Intersil 

QHx220

Overcoming Noise or

Interference Using the QHx220

Identifying Common Sources of

Electromagnetic Interference (EMI)

• A flex cable carrying high-speed data from a

base-band processor to an LCD/Camera display.

• Closely spaced antennas of radios operating

simultaneously.

• Harmonics, other mixing products or spurs that fall

within the victim receive band.

• Poor isolation from local transmitter (via antennas,

duplexers or other front end modules).

• Noise on common Ground or VCC supply lines.

Acquiring and Sampling the Source of

Unwanted Interference

Intersil’s QHx220 reduces EMI by sampling the

interference source at its input. The sampled noise

signal is acquired in close proximity to the noise source

either with an EMI detector, an additional coupling

element on the PCB or direct tap of the noise source

using a RC network.

Emulating the Coupling Channel to Achieve

an Inverse Signal

Once the QHx220 acquires and samples the unwanted

interferer, the general-purpose canceller feeds the

sampled noise signal through an analog signal

processor, which allows control of the phase within 360°

and the amplitude within a dynamic range of 50dB. This

enables the QHx220 to output an inverse signal of the

interference plus coupling channel in order to eliminate

the desensitization of the victim receiver.

3

FN6986.0

October 20, 2009

Share Link: