EMI filter
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United States of America Patent
Stats
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May 27, 2008
Grant Date -
May 3, 2007
app pub date -
Oct 2, 2006
filing date -
Oct 5, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
EMI filter 20 includes input terminal Vin, output terminal Vout, resistor component R1 and diodes D1 and D2. Resistor component R1 is composed of polycrystalline resistor component Rp and ring resistor components R11 and R12. Polycrystalline resistor component Rp is connected between input and output terminals Vin and Vout. Ring resistor components R11 and R12 are provided on one and the other sides of polycrystalline resistor component at a prescribed distance, respectively. Further, diode D1 has cathode and anode electrodes connected to input terminal Vin and reference potential Vss, respectively. Likewise, diode D2 has cathode and anode electrodes connected to output terminal Vout and reference potential Vss, respectively. Ring resistor components R11 and R12 are rectangular in shape to electromagnetically couple to polycrystalline resistor component Rp. When a high frequency signal is applied to input terminal Vin, an electric current flowing through polycrystalline resistor component Rp generates magnetic fields so that ring resistor components R11 and R12 electro-magnetically induce an electric current.
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