A 7.3-μ W 13-ENOB 98-dB SFDR Noise-Shaping SAR ADC With Duty-Cycled Amplifier and Mismatch Error Shaping

Abstract

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Low-Power SAR ADCs: Basic Techniques and Trends

“…In some cases, the loop-filter is fully passive (i.e. : made with switches and capacitors) [26], while in other cases an active filter is made, typically based on a simplified yet highly-efficient amplifier [27]. While the first category benefits from lowest power consumption, the additional kT /C noise terms either impact the SNR, or otherwise relatively large capacitors might be required.…”

“…The active filters enable a higher SNR at the cost of increased power consumption. A review of active filters can be found in [27]. Also, since the SAR quantizer can have a reasonably high resolution, both the filter and the oversampling ratio can For illustration, a recent example of a NS-SAR ADC is shown in Fig.…”

“…While noise-shaping improves the SNR of the SAR ADC, it does not improve the linearity which is typically dominated by DAC mismatch. To deal with this, mismatch error shaping (MES)[28] [26][27] has become a popular technique to shape mismatch errors out of band at the cost of a digital reconstruction function.…”

Design and Analysis of Digitally Tunable Transconductance Amplifier (DTTA) Using CNTFETs

“…Transconductance amplifers transform voltage signals into current signals in analog and mixed-signal electronics. Te entire efcacy of diferent applications such as signal processing, communication systems, and sensor interfaces is determined by their performance [6,7]. Te ability to tune amplifer characteristics is crucial in adapting these circuits to varied settings without sacrifcing efciency [8][9][10].…”

A 96 dB DR Second-Order CIFF Delta-Sigma Modulator with Rail-to-Rail Input Voltage Range

“…However, the area and mismatch of the digital-to-analog converter (DAC) makes it difficult to achieve high-resolution characteristics. SAR ADCs using noise shaping (NS) have been proposed as an alternative to the resolution enhancement limitations of SAR ADCs [9,10], but there are still structural difficulties in implementing resolutions above 14-16 bits. Delta-sigma ADCs typically use analog integrators with op amps, which have the disadvantage of relatively increased power consumption and area, but they have been widely used in high-performance sensor interfaces because they have a suitable structure to achieve high resolution [1][2][3][4][5][6]11,12].…”