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This paper describes circuit design and measurement results of a pure HBT MMIC power amplifier module (PA) operating with a 2.5-V low reference (Vref) and 2.8-V low collector supply voltages (Vcc). While covering 824-925-MHz broadband CDMA operation at 2.8-V Vcc, the PA allows a 1.1-V low Vcc and 18-dBm Pout operation. This is realized by an on-chip step quiescent current selector monitoring collector...
This paper describes circuit design and measurement results of a newly developed GaAs-HBT RF power detector for use in wireless applications. The detector features logarithm-like, frequency-independent characteristics. The detector can be also driven with small input power levels, enabling base-terminal monitor which can utilize directivity of a power stage. Since a unique current-mirror-based topology...
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