QHX220IQSR

Overview

The QHX220IQSR is an active isolation enhancer and interference canceller designed for wireless communication systems. It operates within a frequency range of 300MHz to 3GHz. The device features protocol-agnostic functionality, supporting GSM, CDMA, DVB-H, ISDB-T, and DMB standards. It integrates programmable LNA gain stages in the sampler path and SPI bus controlled integrated DACs. Typical performance includes greater than 20dB noise cancellation capability and a 50dB dynamic range. Power consumption is typically less than 20mW with approximately 2µW in standby mode.

Feature Summary

• Active electromagnetic interference cancellation by sampling noise sources and applying anti-noise signals to victim receive paths
• Protocol agnostic design compatible with multiple wireless standards including GSM, CDMA, and digital broadcasting protocols
• Integrated programmable low noise amplifier gain stages and digital-to-analog converters controlled via serial peripheral interface
• Enhances inherent isolation between antennas or inside duplexers and switches to improve receiver sensitivity and transmit power

Applications

• Cell phones and mobile handsets with local aggressors
• Mobile TV devices and GPS terminals
• Laptop computers supporting simultaneous high data rate services
• Pico- and Femtocells requiring improved antenna isolation
• Linearization of power amplifiers in infrastructure components

Procurement Notes

Verify component authenticity through authorized Renesas distributors due to historical acquisition from Intersil. Confirm package integrity and marking consistency with QH220 identifiers. Check RoHS compliance status against current environmental regulations. Validate datasheet revisions to ensure compatibility with specific system requirements. Request batch traceability documentation for quality assurance purposes.

Selection Notes

Select this component for applications requiring active EMI suppression in multi-radio environments. Consider the 300MHz to 3GHz operational bandwidth for suitability across various wireless protocols. Evaluate power constraints as typical consumption remains below 20mW. Assess integration complexity regarding SPI control and LNA programming. Compare against passive filtering solutions where out-of-band noise cancellation is critical.

Part Context

The QHX220 series represents a specialized RF IC category focused on active interference mitigation rather than standard signal processing. Originally developed by Intersil and subsequently acquired by Renesas Electronics Corporation, it addresses challenges in next-generation wireless terminals. The technology enables simultaneous operation of multiple radios by recovering receiver sensitivity through active noise cancellation techniques.

Replacement Considerations

No direct public substitute part numbers are confirmed for this discontinued component. Designers may need to evaluate alternative active cancellation architectures or passive filtering strategies. Verify pinout and functional compatibility if considering legacy equivalents from other manufacturers.