Koninklijke Philips Corporation N.V.

Lionel Guiraud

Patrick Leclerc

Joao Nuno Ramalho

Thierry Tellier

Fabio Braz

The invention relates to a switching device comprising programmable compensation means which are associated with the input/output connections for inverting the polarity of the input/output connections when said connections present a polarity inversion which is inherent in the conception of the circuits.

Switching device provided with polarity-inverting means

This amplifier is intended for amplifying variable signals superimposed on a continuous signal. This continuous signal serves in particular for biasing a component, a magnetoresistive resistor used as a hard disk reading head. To avoid the harmful effects of a sudden fluctuation in the continuous signal, this amplifier comprises a set of switchable reactive elements () for acting on said transfer function and a bias drift compensation circuit () for controlling the switching of said switchable elements with a view to anticipating the effects of said fluctuation.

Amplifier for alternating signals superimposed on a continuous signal and method for amplifying such signals

The present invention relates to an amplifier CD including a first and a second transistor T and T , connected in series between a power supply terminal VCC and ground terminal. According to the invention the transfer terminal of the first transistor T is connected to the bias terminal of the second transistor T and forms an input of the amplifier CD, the bias terminal of the first transistor T being connected to a reference potential terminal. An amplifier CD in accordance with the invention has low input impedance and a low common-mode output level.

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Saint Aubin sur Mer, France

Lionel Guiraud