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Abstract--Conventional converters for radio frequency induction heating usually follow an AC-DC-AC structure, which can exhibit non-unity power factor and introduce large harmonic currents into the utility supply. The need for a direct converter for radio frequency induction heating, featuring unity power factor, and sinusoidal input current, has motivated the development of a single phase matrix converter as an induction heater. A novel commutation strategy is therefore required to ensure smooth operation of the converter whilst creating a high frequency output under soft switching conditions. The operating principle and features of the proposed converter are described here, and experimentally verified.Index Terms--Induction heating, matrix converter, sinusoidal input current, soft switching, unity power factor.

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A wideband low-noise amplifier (LNA) for long-term evolution applications is presented. A capacitive cross-coupled common-gate in combination with current-bleeding common-source topologies is adopted for wideband input matching, high gain and low noise figure (NF). Inter-cascade inductors are adopted to cancel the inter-stage parasitics, which extend input matching and operational bandwidth to higher frequency with additional NF reduction. Implemented in a 0.18 µm CMOS technology, the proposed wideband LNA shows a voltage gain of 17 dB, a NF of < 2.5 dB, |S 11 | of higher than 10 dB and a maximum IIP3 of + 1.52 dBm over the frequency range of 0.7-2.7 GHz while consuming 7.5 mA from a 1.8 V supply.