A 348-μW 68.8-dB SNDR 20-MS/s Pipelined SAR ADC With a Closed-Loop Two-Stage Dynamic Amplifier
Yigi Kwon, Taewoong Kim, Nan Sun, Youngcheol Chae
Abstract
This paper presents a two-stage dynamic amplifier that achieves the high DC gain and PVT robustness of the residue amplifier in a pipelined SAR ADC. The proposed dynamic amplifier operates in a closed-loop configuration and does not require further calibration. The pipelined SAR ADC occupies 0.065 mm2 in a 65 nm CMOS process. It achieves a peak signal-to-noise-and-distortion ratio (SNDR) of 68.8 dB at a sampling rate of 20 MS/s and draws 348 μW from a 1.2 V supply. This corresponds to a Schreier FoM of 173.4 dB and a Walden FoM of 7.7 fJ/conv.-step. Furthermore, it maintains SNDRs over various sampling rates from 1 to 20 MS/s and its power consumption is scaled linearly.
Topics & Concepts
Spurious-free dynamic rangeAmplifierSuccessive approximation ADCRobustness (evolution)CMOSLinearitySampling (signal processing)PhysicsElectronic engineeringComputer scienceVoltageEngineeringOptoelectronicsCapacitorChemistryOpticsDetectorBiochemistryQuantum mechanicsGeneAnalog and Mixed-Signal Circuit DesignAdvancements in Semiconductor Devices and Circuit DesignSemiconductor materials and devices