News

30 October 2009

 

RFMD launches ultra-linear push-pull amplifiers for CATV infrastructure

At this week’s SCTE Cable-Tec Expo ’09 in Denver, RF Micro Devices Inc of Greensboro, NC, USA launched a portfolio of push-pull amplifiers designed for multiple cable TV (CATV) infrastructure applications. The CGA/CGR product portfolio includes the CGA-1518Z and CGA-7718Z amplifiers for forward path, downstream applications and the CGR-0118Z and CGR-0218Z amplifiers for return path, upstream applications.

Each amplifier leverages RFMD’s proprietary HBT8D InGaP heterojunction bipolar transistor (HBT) process technology, combined with a 'push-pull' architecture, to deliver what is claimed to be best-in-class composite second order (CSO) distortion performance. The push-pull amplifiers are designed for ultra-linear amplification in current- and next-generation CATV applications, including multiple dwelling unit (MDU) amplifiers, low-cost line extenders (LE), and customer premises equipment (CPE).

RFMD says that the CGA-1518Z matches the gain of competing +12Vdc push-pull amplifiers with lower multi-carrier distortion and a reduction of >1.5W in DC power consumption. The CGA-7718Z offers higher gain and lower multi-carrier distortion performance than the CGA-1518Z while consuming 1W less DC power than competing +12Vdc push-pull amplifiers, it is claimed. The CGA-1518Z and CGA-7718Z are suited to applications that require superior broadband amplification and must conserve DC power, such as CPE, MDUs and battery back-up cable and telephone networks carrying voice, data, and video.

The CGR-0118Z offers what is claimed to be the broadband industry’s only 25dB gain surface mount device (SMD) return path amplifier capable of ultra-linear +50dBmV RF output per channel performance from 5MHz to 65MHz combined with low multi-carrier distortion, excellent modulation error ratio (MER) and low DC power consumption. The CGR-0218Z provides what is claimed to be unmatched 5–210MHz bandwidth for ultra-linear return path applications requiring a SMD package, making it ready now for ‘mid-split’ return path architectures and ‘future proof’ for soon-to-be-implemented DOCSIS 3.0 compliant 5–85MHz return path networks. The CGR-0118Z and CGR-0218Z meet the performance requirements demanded by channel bonding capable return path networks, MDU class return amplifiers, and CPE cable modems.

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