Abstract

A direct conversion modulator-demodulator with even harmonic mixers for fixed wireless applications is presented. The circuits consist of even harmonic mixers (EHMs) realized with antiparallel diode pairs (APDPs). The self-biased APDPs are used to flatten the conversion loss of the mixers. We also evaluate the different levels of I/Q imbalances and DC-offsets and use signal space concepts to analyze the bit error rate(BER) of the proposed transceiver using M-ary QAM schemes. The results show that this structure can be efficiently used for fixed wireless applications in Ka-band

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