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This paper describes a tracking power converter and the controller IC for its implementation. The tracking power converter is used for supply modulation of a linear RF power amplifier. Supply modulation improves RF power amplifier efficiency for variable envelope RF signals. This system maximizes tracking bandwidth (-160kHz), ripple suppression (-70dB) and power conversion efficiency (-92%) with a relatively low switching frequency (SOOkHz).

A 10% ASK Smartcard ASIC achieves 3e-10 BER in the presence of digital noise. A 2000 times reduction in digital signature amplitude greatly improves security against DPA attack. Voltage compliance is maintained for more than two decades of received power. The 2.8-mm X 2.9-mm ASIC is fabricated in a 0.6 micron CMOS process with EEPROM.

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