Sgs-thomson Microelectronics S.a.

Lionel Federspiel

Christian Perrin

The present invention relates to an active analog filter including a differential amplifier, an output of which provides a filtered signal and a non-inverting input of which is connected to a median potential between supply potentials of the amplifier, a first series association of a first fixed resistor and a first variable resistor between an input terminal of a signal to be filtered and an inverting input terminal of the amplifier, a second series association of a second fixed resistor and a second variable resistor between the output of the amplifier and its inverting input terminal, and a third variable resistor in series with a filtering capacitor, between a midpoint of one of the series associations and the median potential.

Analog audio filter for high frequencies

A differential amplifier filter with two channels in phase opposition, wherein each channel includes the same network of passive components which includes two impedances coupled in series between a first input terminal of the filter and a corresponding input of the differential amplifier, a feed-forward impedance coupled between a common node of the two series impedances and an output of the same channel of the differential amplifier, and a feedback impedance coupled between a second input of the differential amplifier and an output of the other channel of the differential amplifier.

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Grenoble, France

Lionel Federspiel