For achieving low power and high performance simultaneously, we propose a new low-voltage latch-adder based Wallace-tree multiplier. By choosing the best circuit-structure of the latch-adder for low voltage, while optimizing the number and positions of latch-adders, the proposed 0.18-μm 0.9V 32 32 2's complement multiplier can operate above 60MHz. As compared to the tree multiplier implementing the traditional latch-adder technique, the new tree multiplier with all the proposed techniques achieves a 22.3~23.7% delay improvement with a 5.5~3.3% power reduction. All best latch-adder based tree multipliers have a smaller power-delay-product than the tree multipliers without using the latch-adder technique.
This paper presents a truly all-digital one-point-calibrated temperature sensor for SoC applications. Several design techniques are developed to achieve small area, low power, low energy per sample, and high accuracy. First, in contrast to dual DLL's plus charge pump used in the traditional design, single DLL is used in both calibration and measurement operations to avoid locking mismatch and to increase process-variation tolerance, resulting in advantages in terms of area, power, energy, and accuracy. Second, a normalization-after-averaging design is developed to reduce computation cycles, also leading to low power and low energy. Finally, to meet different applications, clock chopping is used not only for adjustable conversion rate but also for low power when a high conversion rate is not needed. Compared to the state-of-the-art design, the proposed 90nm temperature sensor has 65% less normalized area and 26% higher accuracy with 79% less energy per sample. As the sampling rate is adjusted 1/50 lower, 90% of the power consumption is saved.
In this study, we developed an electric double-layer (EDL) extended-gate field effect transistor sensor based on aptamers to detect cadmium ions (Cd2+). Since the aptamer has a specific binding ability to cadmium ions. The signal is amplified through the transconductance of the FET. The linear detection range of this sensor for cadmium ions is from 1 nM to 10 uM. The Cd2+ calibration curve is shown a high correlation coefficient (R2 = 0.981) and an excellent detection limit as low as 0.094 nM. Importantly, it responds to Cd2+ within 10 seconds. The sensor exhibits high selectivity in the presence of other heavy metals. It also can be reused without significant signal attenuation. The advantages of this method are convenient portability, short detection time, high sensitivity, and simple operation. It has a good prospect for detection in the daily life of cadmium environmental pollution.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.