tailieunhanh - Advances in Analog Circuits Part 8

Tham khảo tài liệu 'advances in analog circuits part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Tunable Analog and Reconfigurable Digital Circuits with Nanoscale DG-MOSFETs 199 circuits designed with the DG-CMOS technology. It is a simple yet very important circuit. Also known as the logic NOT gate in digital logic circuits it has a very wide range of usage in all digital systems at all levels of complexity and determines power X delay product. The switching threshold is usually a trade-off for power and speed and is likely to remain fixed once the device is fabricated. The fabrication tolerances can result in unwanted switching thresholds that are difficult to compensate which can lead to logic errors or poor performance. The DG-CMOS inverter on the other hand can modify the DC transfer curves in order to compensate for the process voltage and temperature variations. Such a flexibility will only be becoming more important as the device dimensions go below 20nm beyond which parameter fluctuations are much larger and more varied Hwang et al. 2009 At the same time even a single IDDG-MOSFET can offer a lot as a programmable elements used for turning off power to a complete logic block in an effort to cut down leakage in power-off modes Tawfik Kursun 2004 . Therefore the variable threshold in IDDG devices has many more avenues to impact mixed-signal design than discussed in the following sections. An interesting and powerful example for reconfigurable static CMOS logic may be found in that uses the back-gate mediated extreme threshold swings to alter the output functionality obtained from only 4 transistors. Obviously what is interesting is not the actual functions implemented which are trivial but the concept which can be extended to include a more complex array of functions using only a fraction of transistors that would be needed in conventional designs. Another impressive approach to building compact reconfigurable circuits were proposed by IBM group who indicated that IDDG n-MOSFETs threshold can be selected high enough so that it would only conduct

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