In this work, the design of a new frequency doubler passive subharmonic mixer circuit for low-power and low-cost biomedical devices is presented using CMOS 0.13J..lm UMC technology. This circuit operates in a quadrature doublebalanced mode and required octet-phases. Included in the design is a circuit that generates an octet-phase LO signals from a differential input, an output LNA buffer and a resistive source degeneration intermedeiate frequency (IF) buffer. The whole circuits consume l.8mA from a l.2-V supply. The mixer with the included circuits achieves 21-dB conversion gain, H-dB noise figure, 12-dBm HP3 and -1l.2-dBm I-dB compression point.
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