| 摘要 |
The present invention relates to a filter arrangement (8C) and a method for frequency filtering and impedance conversion. The invention makes it possible to perform frequency filtering and impedance conversion using fewer inductors than what is required using previously known technique for obtaining the corresponding effect. According to an alternative aspect the invention provides more effective frequency filtering and equivalent impedance conversion compared to the prior art when the same number of inductors are used. According to the invention an electromotive force (e') is generated in at least one filter coil (L1, L4). The electromotive force is adjusted so that the filter arrangement (8C) receives a desired impedance converting effect. A filter arrangement according to the invention, compared to the prior art, in this manner provides a filter integrated with an impedance converter. Compared to the prior art the invention can make a saving of one transformer per impedance converter possible. |
