| 摘要 |
PURPOSE:To attain wave shape of a chroma signal in a small phase delay, by connecting collectors and emitters of three transistors (TRs) in common, connecting a current source at the connecting point of the emitters, and using the connecting point as an output terminal. CONSTITUTION:Emitters of the 1st, 2nd and 3rd NPN TRs Q1, Q2 and Q3 are connected in common, the connecting point is grounded via a current source 3 and the collectors of the TRsQ1, Q2, Q3 are connected in common to a positive DC voltage supply terminal 1. Taking bases 4, 5, 6 of the TRs Q1, Q2, Q3 as input terminals, a signal at a terminal at the highest voltage out of the three input terminals is outputted from an output terminal 6 of the common connection of the emitters of each TR through an emitter follower. |
