This paper presents a potentiostatic-amperometric Delta-Sigma modulator (∆ΣM) for electrochemical sensors, which reuses the electrode-electrolyte impedance for quantization noise shaping. The proposed ∆ΣM is based on a second-order single-bit CT architecture and it includes a cancellation mechanism of the flicker noise coming from the feedback DAC. Rail-to-rail CMOS basic building blocks for the ∆ΣM circuit implementation are presented with the aim of allowing a wide-range potentiostatic operation. Post-layout simulation results are reported for a complete 72-µW 90-dB smart electrochemical sensor frontend currently being integrated in 0.18-µm 6-metal CMOS technology.
A 72-µW 90-dB wide-range potentiostatic CMOS ∆Σ modulator with flicker noise cancellation for smart electrochemical sensors
Dei M.;
2019-01-01
Abstract
This paper presents a potentiostatic-amperometric Delta-Sigma modulator (∆ΣM) for electrochemical sensors, which reuses the electrode-electrolyte impedance for quantization noise shaping. The proposed ∆ΣM is based on a second-order single-bit CT architecture and it includes a cancellation mechanism of the flicker noise coming from the feedback DAC. Rail-to-rail CMOS basic building blocks for the ∆ΣM circuit implementation are presented with the aim of allowing a wide-range potentiostatic operation. Post-layout simulation results are reported for a complete 72-µW 90-dB smart electrochemical sensor frontend currently being integrated in 0.18-µm 6-metal CMOS technology.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
