A 1 V 12 mW 2 GHz receiver with 49 dB image rejection in CMOS/SIMOX

One of the most effective ways of reducing power is to minimize the supply voltage, and the LC-tuned folded mixer is one way to achieve this. For cost reduction, a fully-integrated image-rejecting receiver, i.e. one for which off-chip filters are not required, is a desirable target. A double-quadrature downconverter is usually used to provide sufficient image rejection because the signal is transformed so that gain mismatches and phase errors in the converter inputs are reduced to second-order at the converter outputs. However, the double-quadrature architecture consumes much power because six mixers are used. In spite of its single-quadrature architecture, this 2 GHz receiver suppresses phase errors in LO signals and achieves 49 dB image rejection without trimming.