Ams International Ag

Zeyu Cai

Robert Hendrikus Margaretha Van Veldhoven

Kofi Afolabi Anthony Makinwa

Michiel Pertijs

Makinwa Afolabi Anthony Kofi

One example discloses a ratiometric device, including: a current source having a first current, a second current different from the first current, and a current-select program; a sensor device responsive to a gas and having a sensor-cold temperature T(cold,sens) in response to the first current and a sensor-hot temperature T(hot,sens) in response to the second current; a reference device having a reference-cold temperature T(cold,ref) in response to the first current and a reference-hot temperature T(hot,ref) in response to the second current; and wherein the ratiometric device includes a temperature difference ratio output based on T(cold,sens), T(hot,sens), T(cold,ref) and T(hot,ref).

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Zeyu Cai