Problems with Solutions - Analog Integrated Circuits | ECE 4430, Assignments of Electrical and Electronics Engineering

Download Problems with Solutions - Analog Integrated Circuits | ECE 4430 and more Assignments Electrical and Electronics Engineering in PDF only on Docsity! ECE 4430 – Fall 2004 Page 2 Problem 2 - (10 points) a.) Draw the schematic of the circuit indicated below in the BJT layout and identify the collector, base and emitter terminals. b.) Draw the A-A’ cross-section to scale. The approximate physical thicknesses are: n+ emitter diffusion 1.3µm, p-base diffusion 2.6µm, n-epitaxial layer 10µm, n + buried collector diffusion (not seen from the top view) - into the epitaxial layer 4µm and into the substrate 8µm, all oxide and metal thickness are approximately 1µm. (You may approximate the oxides and diffusions with straight edges for simplicity.) Assume that a n+ buried layer is beneath all n-epitaxial regions. Solution a.) A A' Terminal 1 p+isolation Metal p base n-epitaxial Each square is 1µm x 1µm Fig. F99E1S2 Terminal 2 Terminal 3 n+ emitter. p-base n+ n+ buried layer p-iso n-epitaxial p-substrate n-epi n-epip-iso n+emitter Isolation Terminal 1 Terminal 3 Terminal 2 F99E1S2A b.) See layout on right.