A transformer based 1.8-GHz low-IF receiver for 1V in 0.13-μm CMOS
نویسندگان
چکیده
A fully integrated low-IF receiver for 1.8GHz in 0.13-μm CMOS is presented. The receiver consists of a VCO, an IQ-divider, an LNA, and a double balanced IQ-mixer. The RF input stage and the commutating stage of the IQ-mixer are current coupled via an on-chip transformer which is operating in resonant mode and is performing a current gain. A design method is presented to reduce the input impedance of the mixer’s commutating stage in order to improve the current gain of the on-chip transformer. The receiver takes 25.7mA from a 1-V supply to give an input IP3 of -20.3dBm, an input referred 1-dB compression point of -30.7dBm, a conversion gain of 29.2dB and a noise figure of 3.0dB.
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