Abstract
A phase-alignment system is used in the first reported IC to fully integrate a power amplifier, Cartesian feedback linearization circuitry, and a phase-alignment system. The phase-alignment system consumes 8.8 mW from a 2.5-V supply and employs a new technique for offset-free analog multiplication that enables it to function without manual trimming. Phase alignment of better than 9/spl deg/ is maintained for drifts as large as /spl plusmn/90/spl deg/. We demonstrate how the phase-alignment system improves the stability margins of the fully integrated Cartesian feedback system. The power amplifier itself, integrated on the same die, operates at 2 GHz and delivers a maximum of 14.2 dBm of output power into a 50-/spl Omega/ load. The IC was fabricated in a 0.25-/spl mu/m CMOS process.
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