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(一)设计规范印刷线路板设计的难易程度直接取决于电子线路的功能相连接状况。图1所示两个电路的印刷板设计中,图b比图a难得多。图1(α)由三级共发射极电路串联而成,布局十分简单。事实上,这种方式比较适合于在限制元件位置的情况中使用。在此电路中各元件的接线就是电路节点,这种电路是单向信号源,级间反馈所引起的耦合较小,有利于设计时把问题简单化。这种二端和三端器件的独特应用使得印制板的描绘和加工工艺相对简化。同时,打算避免热耗散或者热耦合问题而不采用功率器件的构思,反过来却简化了电源和地总线设计。对于电气绝缘问题可采用高阻抗级来解决。
(A) design specifications Printed circuit board design depends directly on the degree of difficulty of the electronic circuit connection status. Figure 1 shows two circuit board design, Figure b is much more difficult than Figure a. Figure 1 (α) by a total of three emitter circuit in series, the layout is very simple. In fact, this approach is more suitable for use in situations where component placement is limited. In this circuit, the wiring of each component is the circuit node. This kind of circuit is a unidirectional signal source, and the coupling caused by interstage feedback is small, which is good for simplifying the design. The unique application of these two-terminal and three-terminal devices allows relatively simplified board drawing and processing. At the same time, the intention to avoid thermal dissipation or thermal coupling without the use of power devices, in turn, simplifies power and ground bus design. For the electrical insulation problem can be used to solve the high impedance level.