ECE242 Lecture Notes - Lecture 8: Low Frequency, Parasitic Capacitance

• School: University of Waterloo
• Department: Electrical and Computer Engineering
• Course: ECE242
• Professor: David Nairn

Document Summary

If b = 100, vbe = 0. 7 v (when active), c = 1. 0pf and c = 0. 1pf, find a) the dc operating point b) am = vo/vsig c) fl, and d) fh . 10 k (cid:149) dc analysis (vsig = 0) 10 v (cid:149) midband gain (midband s. s. m) Low frequency small signal models (cid:149) include all coupling & bypass capacitors. 20 k (cid:149) cc1 - assume all other coupling & bypass capacitors are short circuits. 10 k r v (cid:149) cc2 - assume all other coupling & bypass capacitors are short circuits. 5 k (cid:149) ce - assume all other coupling & bypass capacitors are short circuits. (2//10) k ib r . High frequency small signal models (cid:149) include all parasitic capacitors. K (cid:149) c - assume all other parasitic capacitors are open circuits. 1/sc (cid:149) c - assume all other parasitic capacitors are open circuits. Determine the midband gain (am) and fh for the cascoded version of our amplifier.