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It is a basic concept of that deals with the speed of transistor.
Two additional factors that influence the operational speed of a gate
need to be considered and they are
1.FAN-IN
2.FAN-OUT
Note:-
1.As fan-in have indicating that if no of inputs to gate increases then it
increases the delay.
2.As fan-out have indicating no. of loads driven by the output the gate
delay substantially increases.
Fan-in and Fan-out Characteristics
Choice of Layers:-
• In order to meet a given specification of a designer will have several
possible ways to choice the layers.
• And any designer should have commonsense constraints to be
considered.
1. VDD and Vss (GND) should be distributed on metal layers wherever
possible.
2. Long lengths of polysilicon should be used only after careful
consideration because of the relatively high RS value . Polysilicon is
unsuitable for routing VDD or Vss other than for very small
distances.
3. Diffusion layer will have moderate resistance
Fan-in and Fan-out.ppt

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Fan-in and Fan-out.ppt

  • 1.
  • 2. It is a basic concept of that deals with the speed of transistor. Two additional factors that influence the operational speed of a gate need to be considered and they are 1.FAN-IN 2.FAN-OUT Note:- 1.As fan-in have indicating that if no of inputs to gate increases then it increases the delay. 2.As fan-out have indicating no. of loads driven by the output the gate delay substantially increases.
  • 3.
  • 4.
  • 5.
  • 6. Fan-in and Fan-out Characteristics
  • 7. Choice of Layers:- • In order to meet a given specification of a designer will have several possible ways to choice the layers. • And any designer should have commonsense constraints to be considered. 1. VDD and Vss (GND) should be distributed on metal layers wherever possible. 2. Long lengths of polysilicon should be used only after careful consideration because of the relatively high RS value . Polysilicon is unsuitable for routing VDD or Vss other than for very small distances. 3. Diffusion layer will have moderate resistance