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A High Q Gm-C Filter with On-Chip Automatic Tuning Circuit Implemented in Nano-Scale CMOS Process

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A fourth-order Butterworth band-pass filter whose Q value is greater than 10 implemented in nanoscale CMOS process, is presented. The center frequency can be switched by an external switch. The filter integrates a Q-tuning scheme and a frequency tuning scheme. The Q-tuning scheme has a high accuracy based on the LMS algorithm. The basic block OTA in the filter takes advantage of the dynamic source degeneration technique, which could improve the input linearity range. The pass bandwidth is 260 kHz, the adjacent channel rejection is greater than 30 dB, and the max power consumption is only 7.9 mW.
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Document Type: Short Communication

Publication date: September 1, 2014

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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