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US 7,733,165 B2Granted
Circuit arrangement with interference protection
AssigneeInfineon Technologies AG
InventorsPietro Brenner, Edmund Götz
Life of this patent
Estimating the term…
Abstract
A circuit arrangement with an interference protection is disclosed, including a supply line and a ground line, a first circuit and a second circuit. Each of the first and second circuit is connected to the supply line and to the ground line. The circuit arrangement also includes a blocking device coupled to at least the supply line to suppress any interfering signals from being applied to the supply line.
Claims25
A circuit arrangement with interference protection, comprising:
- a power supply terminal configured to receive an external power supply signal from an external power supply line;
- an internal supply line and a ground line;
- a first circuit connected to the power supply terminal and to the ground line and configured to provide an internal supply signal on the internal supply line, said internal supply signal derived from the power supply signal;
- a second circuit connected to the internal supply line and to the ground line and configured to be supplied by the internal supply signal;
- and
- a protective circuit connected to the external power supply line and to the ground line and configured to be supplied by the power supply signal, the protective circuit further coupled to the internal supply line and configured to suppress interfering signals caused by the second circuit on at least one of the internal supply line and the ground line from interfering with the first circuit and vice versa, wherein the protective circuit comprises an element comprising an admittance characteristic in a first frequency range, and a transformation circuit coupled to the element and configured to transform said the admittance characteristic in at least a second frequency range,
- wherein the first circuit and the protective circuit are selectable in response to an activation signal.
4 more elements
A circuit arrangement with interference protection, comprising:
- a power supply terminal configured to receive an external power supply signal from an external power supply line;
- an internal supply line and a ground line;
- a first circuit connected to the power supply terminal and to the ground line and configured to provide an internal supply signal on the internal supply line, said internal supply signal derived from the power supply signal;
- a second circuit connected to the internal supply line and to the ground line and configured to be supplied by the internal supply signal;
- and
- a protective circuit connected to the external power supply line and to the ground line and configured to be supplied by the power supply signal, the protective circuit further coupled to the internal supply line and configured to suppress interfering signals caused by the second circuit on at least one of the internal supply line and the ground line from interfering with the first circuit and vice versa, wherein the protective circuit comprises a reactance multiplier circuit configured to be supplied by the power supply signal, and wherein the reactance multiplier circuit comprises an inductance multiplier circuit.
3 more elements
A circuit arrangement with interference protection, comprising:
- a first circuit configured to provide a supply signal on an internal supply line, wherein the first circuit is configured to be supplied by an external power supply;
- a second circuit configured to process signals and configured to be supplied by the supply signal, wherein at least one circuit of the first circuit and the second circuit causes interfering signals on the internal supply line during operation, the interfering signal comprising at least one frequency;
- a blocking device coupled to the internal supply line and configured to suppress the interfering signals at the at least one frequency, wherein the blocking device comprises a low pass filter operatively connected to the internal supply line, the low pass filter comprising a capacitor and a capacitance multiplier circuit connected thereto, wherein the capacitance multiplier circuit is configured to be supplied by the external power supply, wherein the blocking device comprises a control input terminal configured to receive an activation signal, and wherein the blocking device is configured to operate in a deactivation mode upon receiving one level of the activation signal and to operate in an activation mode upon receiving another level of the activation signal.
Dependencies are inferred from the claim text.