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An integrated CMOS interface for lambda sensor

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4 Author(s)
Civardi, L. ; Italtel Soc. Italiana Telecommun. SpA, Milan, Italy ; Gatti, U. ; Maloberti, F. ; Torelli, G.

Automotive pollution can be reduced by suitably controlling the mixture that is fed to the cylinders. This can be performed by means of a feedback loop including a lambda sond and a processing unit which controls the electronic fuel injectors. This paper describes a CMOS interface which adapts the output signal of a lambda sensor to allow its feeding into the processing unit. It provides a differential to a single-ended conversion with a good common mode rejection, a level shifting around a given reference voltage, and an accurate voltage gain. Both design considerations and the measurements performed on an integrated test structure are presented. The measured variation of the large-signal voltage gain for an input signal of 0 to 1 V is within ±5% when the input common mode voltage ranges from -1 V to 1 V with respect to the negative supply voltage. An output voltage with a precision within ±1 mV is obtained in the presence of an input voltage corresponding to the stochiometric composition of the mixture

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Vehicular Technology, IEEE Transactions on  (Volume:43 ,  Issue: 1 )