Noise suppressing circuit

Details Noise suppressing circuit Noise suppressing circuit

2008-05-27

2008-05-27

Nguyen, Phung T. (Department: 2612)

Communications: electrical

Systems

Selsyn type

C340S315000

Reexamination Certificate

active

10514432

ABSTRACT:
A noise suppressing circuit (1) suppresses noise emerging from an electronic apparatus (2) and propagating through conductive lines (3aand3b). The noise suppressing circuit (1) comprises a low-band noise reducing circuit (10) and a high-band noise reducing circuit (80). The low-band noise reducing circuit (10) is connected to the electronic apparatus (2) through the conductive lines (3aand3b). The high-band noise reducing circuit (80) is cascade-connected to the low-band noise reducing circuit (10) and connected to conductive lines (4aand4b) of a power line (4). The high-band noise reducing circuit (80) comprises: a detection circuit for detecting common mode noise propagating through the conductive lines (3aand3b); a phase-inverted signal generating circuit for generating a phase-inverted signal that has a phase opposite to the phase of the noise detected by the detection circuit; and an injection circuit for injecting the phase-inverted signal generated by the phase-inverted signal generating circuit into the conductive lines (3aand3b).

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