From Skyworks Solutions, Inc.
This paper presents a novel hardware reconfiguration
technique implemented in a dual integrated-circuit (IC) GaAs
HBT power amplifier (PA) design and demonstrates reduced current
and improved efficiency at low power. The method automatically
reconfigures the hardware of an RF IC PA over a given power
transmission. Hardware interfacing and synchronization from outside
the PA is minimized, and automatic gain compensation upon
hardware reconfiguration is achieved with minimal temperaturedependant
calibration. The challenge of integrating such complex
on-chip hardware functions in a GaAs HBT technology was circumvented
by the introduction of a gating concept used in conjunction
with envelope feedback, and careful tradeoffs between circuit
complexity and performance. Designs that suit the on-chip integration
of the technique in GaAs HBT or Si bipolar junction transistor
technologies are described. Experimental data are reported to support
the proposed method.
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Topics of Interest
In this paper, we present a discussion and comparison of CMOS and GaAs HBT technologies for handset power amplifiers. Our perspective is unique to other comparisons in that we actually have products...
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