(a) Devise the transistor-level circuit diagram of a single 4-input CMOS logic gate to implement the following logic fun

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A Devise The Transistor Level Circuit Diagram Of A Single 4 Input Cmos Logic Gate To Implement The Following Logic Fun 1 (147.63 KiB) Viewed 77 times

(a) Devise the transistor-level circuit diagram of a single 4-input CMOS logic gate to implement the following logic function: OPĀ B (C + D) where A, B, C and D are the logic gate inputs and O/P is the logic gate output. Note: You need to provide a brief explanation of the approach you have followed to design the circuit diagram. [7 marks] (b) Design a stick diagram of the logic gate from (a), using dual-well, CMOS technology. Include wells, well taps, contact cuts, routing of power and GND. Use colour coding and/or detailed annotations to represent the wires in the different layers. [7 marks] (c) The logic gate from (a) needs to drive a capacitive load of 50 ff with a rise- time and fall-time of 0.5 ns. If the length of all transistors is 0.2 μm, calculate the required widths for all P-type and all N-type MOSFETs in your logic gate to achieve the required edge-speeds. Clearly show the calculation steps of your solution. Assume VDD = 5 V, Kn = 50 μA/V², Kp = 20 μA/V²