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QH220

Active Isolation Enhancer and Interference Canceller

Renesas Electronics 

QHx220

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Active Isolation Enhancer and Interference Canceller

DATASHEET

FN6986

Rev 0.00

October 20, 2009

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

Typical Application Circuit

control voltages are programmable using a SPI bus

interface.

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 ~ 1mm2 devices are available as

tested bumped die or 3x3mm2 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

FN6986 Rev 0.00

October 20, 2009

Page 1 of 19

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