Andrea Agnes

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— Design strategies for power effective medium/high resolution Successive-Approximation ADC are discussed. The study considers reducing the power of the capacitive array with suitable capacitive attenuators that do not need using non-unity capacitors. The design of minimum power comparators is analyzed and a novel comparator scheme, named time-domain(More)
This paper presents an ultra-low power successive approximation analog-to-digital converter. An improved implementation of the binary weighted capacitors array and a novel comparator that operates in the time instead of the voltage domain are effective and power efficient. The circuit, fabricated in a conventional 0.18-lm CMOS technology, achieves a(More)
This paper presents an incremental converter, based on a second order scheme, able to achieve 19 bit of resolution with 512 clock periods. The design avoids an initial error by an optimal reset of the two integrators, uses a 3-bit quantizer that enhances the resolution, and cancels the offset with a novel technique based on single or double chopping. The(More)
— A method for cancelling the replica image limiting the chopper stabilization technique is presented. The modulation of the 1/f noise at the chopping frequency and its multiple are conventionally reduced by a low-pass filter and, possibly by a notch filter. The method presented here combines the second chopper and the notch filter by using a simple SC(More)
This paper describes an incremental converter based on a second order RD modulator. The scheme uses a 3-bit DAC with inherent linearity, an optimal reset of integrators, and gives rise to an effective offset cancellation with a novel technique based on single or double chopping. The circuit, fabricated in a mixed 0.18-0.6 lm CMOS technology, obtains 1.5-lV(More)
— An ultra low-power SAR ADC is presented. The circuit is the interleaved version of an already designed SAR converter with improved performance. This design uses 7 interleaved converters and achieves a conversion rate of 700 kS/s. The converter has been simulated by using a 0.18-m CMOS technology showing a power consumption as low as 40 W which allows(More)