Atmel Grenoble

E2v Semiconductors

Fabrice Salvi

Thierry Masson

The invention relates to electronic circuits for measuring, by synchronous detection, weak signals whose reference level is not well known and is subject to large fluctuations. A first correlated double sampling is performed between a time Tsituated just before the start of the measurement pulse and a time Tsituated just before the end of the measurement pulse; subsequently, a second correlated double sampling is performed between time Tand a time Tsituated after the end of the measurement pulse. Finally, the difference between signal levels coming from the two measurements is taken, this difference being a representation of the signal value Vm considered with respect to a reference level that is intermediate between the reference levels at times Tand T

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Grenoble, France

Fabrice Salvi