A fully digital operational transconductance amplifier (DIGOTA) architecture for tightly energy-constrained low-cost systems is presented. A 180-nm DIGOTA testchip exhibits an area below the 1000- mu text{m}{2} wall, and 2.4-nW power under 150-pF load, and a minimum supply voltage {V}{min } of 0.25 V. In the 0.3-0.5-V supply range, DIGOTA improves the area-normalized small (large) signal energy FoM by at least 836times ( 267times ) over prior sub-500-mV OTAs, while reducing area by 27times - 85times . The low- {V}{min } and nW-power features are shown to enable direct harvesting at the mm-scale.
Fully Digital Rail-to-Rail OTA with Sub-1000-μm² Area, 250-mV Minimum Supply, and nW Power at 150-pF Load in 180 nm
Aiello O.;
2020-01-01
Abstract
A fully digital operational transconductance amplifier (DIGOTA) architecture for tightly energy-constrained low-cost systems is presented. A 180-nm DIGOTA testchip exhibits an area below the 1000- mu text{m}{2} wall, and 2.4-nW power under 150-pF load, and a minimum supply voltage {V}{min } of 0.25 V. In the 0.3-0.5-V supply range, DIGOTA improves the area-normalized small (large) signal energy FoM by at least 836times ( 267times ) over prior sub-500-mV OTAs, while reducing area by 27times - 85times . The low- {V}{min } and nW-power features are shown to enable direct harvesting at the mm-scale.
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