Combining heart rate, respiration, environment, and activity history enables early arousal prediction and milder intervention before drowsiness disrupts activity.
Using three saturated CFOAs, this converter improves linear resistance-to-frequency and time conversion while keeping resistive sensor circuits simple.
Phase-shifted pre-clocks and timing pulses enable fine edge control without high-frequency wiring, lowering display clock generator cost.
Phase-shifted pre-clocks and timing pulse adjustment cut display wiring while preserving fine clock timing at lower cost.
A recirculating ring-oscillator TDC uses digital error correction and randomized inverter addressing to extend dynamic range with lower power.