RFaxis specializing in Radio Frequency solutions announced that it has published a white paper on RF front-end technology. The company serves the needs of customers in the wireless connectivity and cellular mobility markets.

In a release Dr. Oleksandr Gorbachov, CTO of RFaxis said, “As more mobile devices require concurrent operation of 3G/4G cellular and Wi-Fi, there is an increased demand to improve the performance and cost structure of co-existence filters with paradoxical criteria such as low in-band insertion loss, high out-band rejection, minimal component size and lowest price.”

“We have found an alternative solution to this problem by taking advantage of the unique device/process characteristics of RF CMOS, along with proprietary design methodology, we are able to significantly reduce the Wi-Fi PA noise leakage to the WCDMA receive band, thus allowing RF system designers to use co-existence filters with highly relaxed specifications. This not only helps them reduce BOM cost, but also results in improved Wi-Fi performance,” Gorbachov added.

The white paper on RF front-end technology entitled “CMOS Wi-Fi RF Front-Ends for Mobile Handset Applications – Part-I” is the first among a three-part series that enumerates all RF-related technical challenges that crop up in dual-mode Wi-Fi/cellular handset designs.

Besides, the paper also explains the technical solutions that RFaxis has developed to control problems that are faced by RF/wireless customers. Also the white paper gives comprehensive test data and comparison of noise contributions with respect to different types of Wi-Fi power amplifiers and front-end modules in the UMTS/WCDMA receiver band supplied by multiple tier-one vendors.

The study reveals that the total noise power in the WCDMA receive band increases with WLAN transmit power level for all technologies except in the case of bulk CMOS. Also CMOS based Wi-Fi RF Front-end ICs (RFeIC) from RFaxis needs 1.0-1.5dB less linear power at PA output. This reduces current consumption and also enhances receiver sensitivity of the Wi-Fi system, said officials.

Mike Neshat, chairman and CEO of RFaxis, commented, “We are pleased to share our results with the wireless community, and provide a ready-to-go solution to our OEM/ODM customers. This is another key breakthrough from the RFaxis team, to make RF CMOS the next mainstream solution that can meet the most demanding RF front-end requirements for today’s highly sophisticated wireless products such as smartphones, tablets and ultrabooks.”

RFaxis announced recently the sampling of its pure-CMOS, RFX8420 RF Front-End Integrated Circuits (RFeICTM). The chip was designed to meet the high performance and ultra-compact size requirements for dual-mode Wi-Fi/Bluetooth operation in mobile devices such as smartphones, feature phones and tablets.