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Proper acquisition of the photoplethysmography signals is essential in a pulse oximetry system and sensor placement plays an important role in this respect. Due to the complex structure of the finger tissue, inadequate sensor placement will have an adverse effect on the light path and high signal quality may become impossible to achieve [1]. In this paper, we present a ring shaped oximeter that uses...
A low current front end trans-impedance amplifier (TIA) switching bank for multi-spectral photodiode (PD) arrays is presented. The design mitigates PD capacitance effects by using a gm-boosted input common-gate stage. Simulation results show that a bandwidth of 97 MHz can be reached with a maximal gain of 7.53 MΩ with a tuning range of 24 dB. The system is suited to low PD currents as its total input...
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