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High CMRR Instrumentation Amplifier (Schematic and Layout) design for biomedical applications

Instrumentation amplifiers are intended to be used whenever acquisition of a useful signal is difficult. IA’s must have extremely high input impedances because source impedances may be high and/or unbalanced. bias and offset currents are low and relatively stable so that the source impedance need not be constant. Balanced differential inputs are provided so that the signal source may be referenced to any reasonable level independent of the IA output load reference. Common mode rejection, a measure of input balance, is very high so that noise pickup and ground drops, characteristic of remote sensor applications, are minimized.Care is taken to provide high, well characterized stability of critical parameters under varying conditions, such as changing temperatures and supply voltages. Finally, all components that are critical to the performance of the IA are internal to the device. The precision of an IA is provided at the expense of flexibility. By committing to the one specific task of

Huawei Ascend D quad XL

Huawei were keen to boast about how their offering was “the world’s fastest”, and that certainly seems to be the case if you rely on these benchmarks.



the Ascend D quad XL has a 4.5-inch 720p IPS display, 1GB of RAM, eight megapixel camera with 1080p video recording, plus a large 2,500mAh battery, all running on Ice Cream Sandwich. There’s no word on what carriers the device is headed to, although Huawei have promised a Q2 launch.

The Ascend D quad XL tops the list with 62.75 frames per second, beating Qualcomm’s dual-core Snapdragon S4, as well Tegra 3 


As you can see from the chart, Huawei’s chip manages to beat NVIDIA’s quad-core Tegra 3 processor found in the Transformer Prime, and the dual-core 1.4Ghz Exynos processor found in the Galaxy Note.



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