An RF–DC Converter with Wide-Dynamic-Range Input Matching for Power Recovery Applications

摘要

An improved RF–dc converter based on a class-E rectifier with wide-dynamic-range input matching is presented. The input impedance is controlled by two varactor diodes to compensate for impedance changes with RF input power and dc loading conditions. The RF–dc converter achieved a peak efficiency of 60% and an $S_{11}$ less than $-$ 20 dB over an input RF power range of 12 dB and an operating battery voltage of 2.5–4.2 V at 800 MHz. An analytical model for input impedance and efficiency was developed and shown to match simulation and measurement results.