Developed design procedures for microwave circuit analysis and design for high efficiency amplifiers. This is the frequency limit for suboptimal switched mode operation for this device. Achieved record performance in high frequency micromachined filters and MEMS switches and low frequency MEMS filters and mixers. Proposed, and demonstrated a novel circuit topology for an RFIC subharmonic double-balanced mixer. This is significant for low-power direct conversion receivers and dual frequency systems.
Performance compares favorably withconventional double-balanced mixer.
Invented and demonstrated a mixer and filter which would allow significant power reduction in the mixer stages Implemented switchability and unabililty in VHF micromechanical filters up to 70 MHz. Investigated via simulation the use of banks of tiny, passive micromechanical filters to realize an RF channel-select receiver architecture capable of orders of magnitude power reduction by trading power for selectivity in frequency hopping architectures. Demonstrated a virtually levitated resonator design that ideally eliminates anchor losses by supporting a free-free beam resonator at node points with support geometries chosen so that zero impedance is presented to the resonator at attachment locations. Such resonators have been demonstrated up to 93 MHz with Q's still around 8,000, and no sign of Q-reduction with increasing frequency. Gain is accomplished parametrically.