US 5,182,531 AGranted

Interference protected electronic apparatus

AssigneeRobert Bosch GmbH

InventorsGerhard Fieldler, Gerhard Conzelmann

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Abstract

An electronic device is suggested which comprises a signal emitting circuit part (1) and a signal processing circuit part (4), at least one line for supplying the signal processing circuit part (4) with operating current and/or at least one signal input line (6) and/or at least one signal output line being guided to the signal processing circuit part (4) from an external circuit. The device includes at least one filter circuit (7) which is connected to the signal processing circuit part (4) and inserted into the signal line (6). The filter circuit (7) comprises additional damping elements for the associated line (6) for damping interference voltage induced by of external high-frequency fields. The amplitude of the interference voltage is greater, preferably substantially greater, than a linear control range of circuit elements of the signal processing circuit part (4). Damping elements and filter circuits are monolithically integrated together with the signal processing circuit part (4). The teaching of the invention is also to be applied to the signal emitting circuit part (1) insofar as the induced interference voltage influences its signal output.

Claims30

Dependent claims

Electronic device comprising a signal processing circuit part (4) having signal processing circuit elements, at least one line from an external circuit being connected to said signal processing circuit part (4);

and circuit means structured as a filter circuit (7) and connected electrically to the signal processing circuit part (4) for damping a high-frequency interference voltage induced by an external electromagnetic field, said high-frequency interference voltage having amplitudes greater than a linear control range of the signal processing circuit elements of the signal processing circuit part (4), wherein the circuit means are assigned to the at least one line (6) and are monolithically integrated, said circuit means comprising circuit means components for damping the high-frequency interference voltage and being constructed so that the greater amplitudes of the high-frequency interference voltage do not generate one of a rectified voltage and a rectified current which noticeably shifts operating points of the signal processing circuit elements, at least one of the components (71, 713, 714, 72, 73, 75, 75) of the circuit means being a region introduced into a monocrystalline semiconductor material and forming a p-n junction with the semiconductor material.

Dependencies are inferred from the claim text.