| 摘要 |
PURPOSE: To attain very strong loop isolation by placing 1st-4th filter elements, having low and high-pass characteristics to two paths, connecting a load to a connecting point of the 3rd and 4th filter elements, and inserting a signal polarity inversion element between the two filter elements. CONSTITUTION: A 3rd filter element CA, having a high-pass characteristics connecting to a 1st path ad a 4th filter element LA having a low-pass characteristic connecting to a 2nd path are connected in series. Then a signal polarity inversion element TA is inserted in series with the two filter elements CA, LA and connecting points 3, 4 of the 3rd and 4th filter elements CA, LA are connected via a matched impedance (load) ZCA, especially a resistor equal to the characteristic impedance of a cable. As a result, the amplifier is obtained simply and at a low cost, in which vary strong loop isolation is realized.
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