a 147dbω, high dynamic range analog front end for ppg signal acquisition with fine and coarse steps automatic gain control

This paper deals with the design of a low power, high-gain, low noise and high-dynamic range receiver dedicated for photoplethysmography (ppg) signal sensing. a current measurement system utilizing a large dc cancelation block, implemented in 180nm cmos technology. the shunt feedback trans-impedance amplifier (tia) is designed to detect and sense low currents, producing a voltage output. it exhibits a noise floor of 39.7 parms within the frequency range of 0.5-10hz. the receiver gain is 147.6dbω. the receiver incorporates a fine and coarse steps gain control block (facgc) and a dc cancelation block capable of handling up to 100µa, thereby enabling a wide dynamic range. the proposed system exhibits characteristics such as low noise and wide dynamic range, rendering it well-suited for the precise measurement of ultra-low current. consequently, this system holds significant potential for application in biosensor technology. the chip has a footprint of 0.121mm2 area and operates with a power consumption of 40.14 micro-watts, drawing power from supply voltages of ±0.9 volts. the post-layout simulation reveals a lower frequency limit below 1mhz, while the upper limits of its application band can be extended up to 100 hz.

a 147dbω, high dynamic range analog front end for ppg signal acquisition with fine and coarse steps automatic gain control

this paper deals with the design of a low power, high-gain, low noise and high-dynamic range receiver dedicated for photoplethysmography (ppg) signal sensing. a current measurement system utilizing a large dc cancelation block, implemented in 180nm cmos technology. the shunt feedback trans-impedance amplifier (tia) is designed to detect and sense low currents, producing a voltage output. it exhibits a noise floor of 39.7 parms within the frequency range of 0.5-10hz. the receiver gain is 147.6dbω. the receiver incorporates a fine and coarse steps gain control block (facgc) and a dc cancelation block capable of handling up to 100µa, thereby enabling a wide dynamic range. the proposed system exhibits characteristics such as low noise and wide dynamic range, rendering it well-suited for the precise measurement of ultra-low current. consequently, this system holds significant potential for application in biosensor technology. the chip has a footprint of 0.121mm2 area and operates with a power consumption of 40.14 micro-watts, drawing power from supply voltages of ±0.9 volts. the post-layout simulation reveals a lower frequency limit below 1mhz, while the upper limits of its application band can be extended up to 100 hz.