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— Dynamic spectrum access (DSA) is a promising approach for the more effective use of existing spectrum. Of fundamental importance to DSA is the need for fast and reliable spectrum sensing over a wide bandwidth. A model for two-stage sensing is described based on an analysis of the mean time to detect an idle channel. Simulation results show that it(More)
State-of-the art neural recording systems require electronics allowing for transcutaneous, bidirectional data transfer. As these circuits will be implanted near the brain, they must be small and low power. We have developed micropower integrated circuits for recovering clock and data signals over a transcutaneous power link. The data recovery circuit(More)
—A common material in creating memristors is titanium dioxide (TiO 2), grown by atomic layer deposition, sputtering , or sol-gel process. In this letter, we study the memristive behavior in thin TiO 2 films fabricated by brief electrochemical anodization of titanium. The effects of different anodization times and annealing are explored. We discover that(More)
—A parallel, multi-resolution spectrum sensing technique that is amenable to multiple-antenna cognitive radios is introduced. We show that for energy-detector-type spectrum sensors, the total sensing time due to FFT latency is reduced by 100 times using the proposed method versus the fixed-resolution, serial detection method employed in single-antenna(More)
This paper presents a reconfigurable multimode low-noise amplifier (LNA) capable of single-band, concurrent dual-band, and ultra-wideband operation. The multimode operation is realized by incorporating a switched multitap transformer into the input matching network of an inductively degenerated common source amplifier. The proposed LNA achieves single band(More)
We present a low power FM transmitter for use in neural recording telemetry. The transmitter consists of a low noise biopotential amplifier and a voltage controlled oscillator used to transmit the amplified neural signals at a frequency of 433 MHz. The circuit is powered through a transcutaneous, inductive link. The power consumption of the transmitter is(More)
This paper presents a reconfigurable multimode LNA capable of single band, concurrent dual-band, and ultra-wideband operation. The multi-mode operation is realized by incorporating a switched multi-tap transformer into the input matching network of an inductively degenerated common source amplifier. The proposed LNA achieves single band matching at 2.8 GHz,(More)
Parasitic magnetic coupling is a major design challenge for integrated circuit designers. Fundamentally, it originates in conventional spiral inductors because the magnetic field is not localized, extending far beyond the perimeter. This paper introduces a twisted winding scheme for inductors that increases the localization of the magnetic field, reducing(More)