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Digital Pre-Distortion

Question asked by kaelly_farnham Employee on Oct 1, 2013

Digital Pre-Distortion—Now even more important to the RF PA engineer

Read the latest blog post from the ESL Design Notebook

A transition is now underway in the wireless communications industry as wireless service providers embrace broadband communication standards such as LTE-Advanced and IEEE 802.11ac. These requirements place new demands on linearity, bandwidth and power consumption in wireless components.

For example, LTE Advanced supports up to 100-MHz bandwidth to reach 1Gb/s and 500 Mb/s data rates for the downlink and uplink, respectively. IEEE 802.11ac will support 80-MHz and 160-MHz bandwidths to achieve throughputs of at least 1 Gb/s for multi-station and 500 Mb/s maximum for a single link.

Design Challenges for the RF PA designer

For the communications system architect and the RF power amplifier (PA) designer, these new formats introduce a number of challenges. Designers must determine the performance gap between their existing 3G designs and tomorrow’s 4G operating environments, and whether these 3G designs will need to be redesigned, or a new vendor qualified. The hardware must also meet or exceed absolute performance metrics such as ACPR, EVM or throughput (e.g., BLER, BER and PER), while also meeting internal product design goals.

Because smart phones and other advanced wireless devices rely so heavily on battery power, getting the most efficiency out of a design is critical and RF power amplifier plays a particularly key role. Choosing and designing the right PA to meet design goals is a significant challenge. Continue reading...