Low-Voltage and Low-Power 1.9GHZ Body-Input Downconversion Mixer

This paper describes a mixer, designed in CMOS 0.18μm technology, which uses the body terminal of the transistor as one of the inputs. This method allows for the radio-frequency (RF) and local oscillator (LO) stages in traditional switching mixers to be collapsed into one stage, thereby allowing for operation at lower supply voltages and lower power comsumption levels. The mixer was designed to downconvert a 1.9GHz RF signal to a 250MHz intermediate-frequency (IF) signal. The simulated performance characteristics result in a power consumption of 400pW from a 0.8V supply, a conversion gain of 3dB, a single sideband (SSB) noise figure of 10dB, and an input-referred 3rd-order intercept point (IIP3) of −11dBm.