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January 2006 [Components] Amplifying PA Theory For Efficient ISM Transmitters Short-range applications in the industrial-scientific-medical (ISM) bands between 300 and 450 MHz are rapidly expanding. Key components for these applications are low-cost amplitude-shift-keying (ASK) and frequency-shift-keying (FSK) transmitter integrated circuits (ICs), although proper system design involves balancing output-power and current-drain requirements for the transmitter's power amplifier (PA). Fortunately, some straightforward techniques make it possible to manage this trade-off... |
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