A high-precision CMOS biophotometry sensor with noise cancellation and two-step A/D conversion

Khiarak, Mehdi Noormohammadi; Sasagawa, Kiyotaka; Tokuda, Takashi; Gosselin, Benoît

doi:10.1109/newcas.2017.8010163

Cited by 12 publications

(1 citation statement)

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“…The parasitic capacitance of PD is significantly larger than the parasitics of the transistors, C PD ) c gs;gd . Based on these conditions, the simplified transfer function is calculated as (13), where the compensation capacitor C C , shifts the second pole, P 2 , further away from the first pole, P 1 , and introduces a left half plan zero, Z 1 , in the transfer function. By choosing the design parameter, so as, Z 1 and P 2 to be close enough to each other, a more flat transimpedance gain and better phase margin response are achieved.…”

Section: Small Signal Analysis Of Tia Stagesmentioning

confidence: 99%

A configurable fluorescence sensing front-end for ultra-low power and high sensitivity applications

Rafati

Qasemi

Alvandpour

2021

Analog Integr Circ Sig Process

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This paper presents an ultra-low power, high sensitivity configurable CMOS fluorescence sensing front-end for implantable biosensors at single-cell level measurements. The front-end is configurable by a set of switches and consists of three integrated photodiodes (PD), three transimpedance amplifiers (TIA) for detecting a current range between 1 pA up to 10 mA. Also, an ambient light canceling technique is proposed to make the sensor operate under different environmental conditions. The proposed front-end could be configured for ultra-low light detection or ultra-low power consumption. The circuit is designed and fabricated in a 0.35 µm standard CMOS technology, and the measurement results are presented. The minimum integrated input-referred current noise is measured as 1.07 pA with the total average power consumption of 61.8 µW at an excitation frequency of 80 Hz. For ultra-low-power configuration, the front-end has an average power consumption of 119 nW and input integrated current noise of 210 pA at an excitation frequency of 20 kHz.

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Section: Small Signal Analysis Of Tia Stagesmentioning

confidence: 99%