QHX220IQSR【PDF 1/19 页】IC RF NOISE CANCELLING 16QFN

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Active Isolation Enhancer and Interference Canceller

QHx220

Electromagnetic Interference (EMI) is emerging as a

major concern in next generation wireless

communication systems. As wireless terminals now

support multiple services and features that utilize high

data rates simultaneously, removing interference within

wireless terminals like handsets has become a challenge.

Reducing the Electromagnetic Interference recovers

the receiver sensitivity, enabling simultaneous

operation of multiple radios, and improves the overall

quality of service of communication devices. Intersil’s

QHx220 is situated in a handset to sample the source

of the noise and emulate the RF coupling channel

between the noise source and victim receiver antenna.

In doing so, an anti-noise signal can be applied directly

to the victim receive path to cancel the EMI and

achieve the signal integrity benefits. This approach

makes it possible to cancel both in-band (within the

victim Rx band) or out-of-band aggressors. This is a

revolutionary approach since it is only possible to

cancel out of band noise using conventional Rx filters.

In addition QHx220 may be used to increase the

inherent isolation between antennas or inside duplexers

and switches, thus allowing to increase the transmit

power in repeaters or yielding higher sensitivity in the

receivers. Both measures finally resulting in a better

coverage, larger cell size, smaller antennas or lower

power of infrastructure components such as

basestations, pico-and Femtocells as well as repeaters.

The QHx220 integrates the sampler path LNA gain stages

as well as the DACs required to control the I and Q

control voltages (used to set the magnitude and phase of

the cancellation signal). Both the gain, and control

voltages are programmable using a SPI bus interface.

Typical Application Circuit

Features

? Protocol agnostic. Designed for: GSM, CDMA, DVB-H,

ISDB-T, DMB

? Frequency Range 300MHz to 3GHz

? Integrated, programmable LNA gain stages in the

sampler path

? SPI bus controlled integrated DACs

? >20dB Noise Cancellation is possible

? 50dB typical Dynamic Range

? Low Power Consumption (<20mW typical, ~2μW

standby)

? Ultra Small ~ 1mm 2 devices are available as tested

bumped die or 3x3mm 2 QFN package

Applications

? Most any wireless device with a local aggressor:

- Cell phones

- Mobile TV devices

- Laptop Computers

- GPS terminals

- Pico- and Femtocells

? Improved Tx to Rx Isolation of devices (i.e. duplexer,

switches) or between neighboring antennae

? Basestations

? Linearization of PAs

Benefits

? Actively cancels unwanted local RF noise

? Improves BER, receiver sensitivity, C/N by canceling

noise generated from local aggressors

? Improves isolation between adjacent antennas

? Can be used to cancel in-band or out-of-band

interferers (i.e. spurs, harmonics, phase noise, or

other noise sources like IM products generated in a

PA)

? Enables simultaneous operation of multiple

co-located radios

? Improves overall quality of service

FIGURE 1. ACTIVE ISOLATION ENHANCER AND NOISE

CANCELLER

October 20, 2009

FN6986.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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