Abstract
A 1-V 2-GHz receiver that exhibits an image rejection of 49 decibels is described. It consists of a low-noise amplifier, a quadrature mixer and on-chip polyphase filters, and was fabricated by 0.2-μm fully depleted CMOS/SIMOX technology. The quadrature mixer employs an LC-tuned folded structure with a common RF input for I and Q channels, and this enables 1-V operation and suppresses phase errors in LO signals. The current source of single-to-balance converter at the mixer input consists of a transistor and an LC tank in a cascode configuration. This enhances its output impedance and improves its common-mode-rejection ratio. The chip consumes 12 mW with 1-V power supply. The receiver provides an NF of 10 dB with an IIP3 of -15.7 dBm.
