A new fully differential (FD) low input impedance CMOS current buffer with low voltage, and low power operation is presented. The low input impedance is achieved by remarkable reduction of the input node voltage swing using a novel double feedback scheme. Some advantages of the proposed double feedback scheme over the conventional (either positive or negative) feedback techniques are: lower inp...

Autonomous micro-sensor nodes rely on low-power circuits to enable energy harvesting as a means of sustaining long-term, maintenance free operation. This work pursues the design of an ultra low-power analog-to-digital converter (ADC) whose sampling rate and resolution can be scaled to dynamically recover power savings. The proposed ADC has a sampling rate of 0-100 kS/s and a resolution of eithe...

Modern neuromodulation systems typically provide a large number of recording and stimulation channels, which reduces the available power area budget per channel. To maintain necessary input-referred noise performance despite growingly rigorous constraints, chopped neural front-ends are often modality choice, as chopper-stabilization allows to simultaneously improve (1/f) consumption. The result...

We study analytically and experimentally the performance limits of a Si-photonic (SiP) balanced coherent receiver (CRx) co-packaged with transimpedance amplifiers (TIAs) in a colorless WDM scheme. Firstly, the CRx architecture is depicted and characterization results are presented. Secondly, an analytical expression for the signal-to-noise ratio (SNR) at the CRx output is rigorously developed a...

S. Michaeli, D. J. Sorce, S. Anderson, E. Hu, J. Lin, K. Ugurbil, M. Garwood, J. Frank Radiology, CMRR, University of Minnesota, Minneapolis, MN, United States, NHLBI, National Institutes of Health, Bethesda, MD, United States, LDRR, National Institutes of Health, Bethesda, MD, United States Introduction: Rotating frame transverse relaxation (T2ρ) is the dominant relaxation mechanism during an ...