| 摘要 |
PURPOSE:To provide a compact and inexpensive sum difference circuit of a simple consitution which is suitably applied to a DPSK demodulation circuit using an SAW (surface acoustic wave) convolver, etc. CONSTITUTION:A set of input windings 11 and 12 and an output winding 13 and a set of input windings 14 and 15 and an output winding 16 are turned into the trifilar windings 5 and 6 respectively. These windings 5 and 6 are wound round a magnetic loop 17a of a spectacle core 17 in the form of a 1st coupling part 9. The winding 6 is wound round a magnetic loop 17b to form a 2nd coupling part 10. The winding 11 of the winding 5 is connected to the winding 14 of the winding 6 in the same winding polarity. Meanwhile the winding 12 is connected to the winding 15 in the opposite winding polarity. Thus the sum output and the difference output are obtained from the windings 13 and 16 respectively. |
