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A continuous-time (CT) bandpass sigma-delta modulation based closed-loop interface implemented with an innovative charge-to–voltage (C/V) converter is proposed in this paper. Compared to conventional CT closed-loop implementations with large feedback resistors to settle the input common mode (CM) voltage of the amplifier within the C/V converter, the proposed C/V converter with reset is simple and...
Highly-digital, time-/frequency-based architectures have become an attractive alternative to amplitude-based techniques for sensor interfaces due to their high time resolution, low power and area scalability potential. However, even though thermal noise can be addressed by applying oversampling, offset and 1/f noise limit the resolution at low frequencies. Therefore, dynamic offset cancellation techniques...
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