| 摘要 |
PURPOSE:To make easy the adjustment of the amplitude of the input signal of differential form, by amplifying two differential input signals, through coupling the signal via the delay line and the signal from the input terminal of the delay line, and supplying them to two primary windings of the transformer. CONSTITUTION:The differential input signals opposite in phase each other are fed to the terminals 2 and 2a, and they are branched into the delay signal (D, Da) amplified at the transistors Tr 20, 20a via the delay lines 4, 4a through the matching resistors 3, 3a, and into the reflected delay signals (R, Ra) amplified at Tr 33, 33a from the input terminal of the delay line, and they are fed to the primary windings 30, 30a of the transformer 28. The signal D is fed to the beginning of turn of the winding 30 and the signal R is to the end of turn, further the signal Ra is fed to the beginning of the turn of the winding 30a and the signal D is fed to the end of turn. Accordingly, at the secondary winding 39 of the transformer, the equivalent waveform between the delay signal and the reflected delay signal of the two input signals are obtained. By adjusting the resistors 8, 9, 8a, 9a, the amplitude of the differential input signals can easily be made in agreement and the in-phase noise can be removed. |
