Multi-band and Multi-resonance Oscillators
Hossein Hashemi

As a part of a larger-scaled project, "concurrent multiband radio systems", we have studied integrated electrical oscillators capable of operating at multiple frequency bands. Multi-resonance oscillators have interesting properties such as the ability to oscillate at any of the multiple resonance frequencies and also to simultaneously oscillate at those frequencies depending on the circuit nonlinearities. We have also shown the possible phase-noise improvement of these oscillators compared to single-resonance ones. (full report)

A 24GHz CMOS Front-End
Xiang Guan and Ali Hajimiri

The first 24GHz 0.18-um CMOS front-end is reported. It down-converts an RF input at 24GHz range to an IF of 5GHz range with a power gain of 27.5dB and an overall noise figure of 7.7dB. It achieves an input return loss, S11 of -21dB drawing 43mA from a 1.5V supply. The LNA achieves a voltage gain of 22dB and a noise figure of 6dB consuming 16mA of dc current. This performance is achieved by utilizing a new LNA topology, common-gate with resistive feedthrough, which shows a graceful performance degradation and low minimum achievable noise figure at very high frequencies. (full report)