High-Efficiency Linearized LDMOS Amplifiers Utilize the RFAL ...
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High Frequency Design AMPLIFIER DESIGN From February 2006 High Frequency Electronics Copyright © 2006 Summit Technical Media High-Efficiency Linearized LDMOS Amplifiers Utilize the RFAL Architecture By Ray Gutierrez Micronda LLC The latest base station amplifier de- This article provides design and measured performance details for a power less telecom industry signs for the wire- amplifier using a recentlydeveloped technique for rate services with lower offer much higher data distortion cancellation levels of distortion than preceding designs, providing high efficiency and reliable long life at lower cost. These amplifiers are also required to be economical and work reliably over a wider range of environmental conditions than the typical air-conditioned ground-based stations. Efficiency and thermal issues are critical to the type of power amplifier selected for these newer applications. There are many amplifier types and architectures used for amplifying complex modulated signals. Each type has different levels of efficiency, acceptable distortion, complexity and cost: • Linear Class A Amplifiers • Linear Class AB Amplifiers • Parallel or Serial Combined Amplifiers • Doherty Amplifiers • Cartesian Loop • EE&R (Envelope Elimination & Restoration) • LINC/CALLUM (Linear Amplification using Non-Linear Components) / (Combined Analog Locked-Loop Universal Modulator) • Cross-Cancellation Amplifiers • HAT (High Accuracy Tracking) • Predistortion Amplifiers • Feedforward Amplifiers • RFAL Amplifiers (Reflect Forward Adaptive Linearizer) Figure 1 · Block diagram showing the RFAL architecture. These types of amplifiers each have advantages and disadvantages when used in different applications. The pros and cons of these design techniques have been discussed in many previously published papers (see references). Frequently, many of the amplifier types listed are used within another, such as in “feedforward” and “nested-loop feedforward” amplifier configurations. The RFAL amplifier (Reflect Forward Adaptive Linearizer) is a recently patented linearization technique that uses the information present in the reflected input signal of the first amplifier (Main 1) to create a correction signal feeding a second identical amplifier (Main 2). This significantly reduces all the distortion products of the RFAL power amplifier assembly while doubling the fundamental output power of the Main 1 amplifier. A simplified block diagram is outlined in Figure 1. 22 High Frequency Electronics
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