| 摘要 |
PURPOSE:To reduce the variation of the switch impedance and thus secure an enough isolation between the distributed signals, by constituting the switch circuit and the signal distributing circuit with the emitter-follower. CONSTITUTION:The signals supplied to the terminal 10i are distributed by the emitter-follower distributing circuit 20i consisting of the transistor 4 and the resistance 15 to be applied to the emitter-follower switch circuits i1-iN. The base biases VB1-VBN of the circuits i1-iN are controlled, and thus the on/off control is given to the circuits i1-iN. The outputs of these switch circuits are taken out at the desired terminal via the impedance matching resistances 121-12N and the DC blocking capacities 131-13N. |
