Design and Simulate Radio Frequency (RF) CMOS Mixer Circuit

Radio frequency design has been one of the principal research areas in the· recent past.
Much of work has been done in integrating data with wireless communication. Since
a decade ago, the frequencies for such communication have been in free bands
available in the low frequency spectrum like 900 MHz and lower. With rapid
improvement in the technology of microelectronic nowadays, these frequency
spectrums are improved to be within the range of ultra band frequencies of GHz.
These emergences of several RF Wireless Communication standards of
communication have demanded availability of low cost analogue blocks for use in
transceiver. Despite rigorous research undergoing, it has been difficult to meet the
design specification by low cost technologies like CMOS. In this project, the
presented mixer down converts Radio Frequency (RF) of 1.8 GHz to 200 MHz
which typifies specifications for a GSM 1800 receiver with Voltage Conversion Gain
(VCG) of 7.703 dB, IIP3 of 10.916 dBm and Noise Figure (NF) of 11.094 dB with
current utilization of 6 rnA. This hi.gh conversion gain and low noise figure mixer is
achieved by utilizing Differential Gilbert Mixer Cell. The mixer was simulated in
analogue environment of Spectra Cadence Schematic.