| 摘要 |
<p>PURPOSE:To improve return loss characteristics by making input signals, which are impressed to the inverted and uninverted input terminals of each feeding amplifier, symmetrically with each other. CONSTITUTION:The feeding circuit 50 has the function of an inverting amplifier incorporated in the 1st and the 2nd feeding amplifiers 51 and 52. Further, gains to AC signals AC1 and AC2 and gains to DC signals DC1 and DC2 are set individually of each other. Namely, the AC gains are set selectively smaller than the DC gains. Consequently, the operation margin to the AC signals is expanded to easily adjust a return loss and also increase it with high accuracy.</p> |
