OPERATIONAL AMPLIFIERS AND DIODES Sample Problems - Dr. Aydın ˙ I. Kars ¸ılayan 1. In the circuit below, assume that the opamps are ideal, and their saturation voltages are less than the reverse breakdown voltage of the diode ( | V SAT | < | BV | ). (a) Using the constant-voltage-drop model for the diode, ﬁnd V o as a function of V i . (b) Sketch the DC transfer characteristics ( V o vs. V i ). (c) Verify your results using Pspice. For the diode, use the model D1N4002. Provide schematics and all necessary plots with measurements. U 2 U 1 4k R 1 3k R 2 2k R 3 1k R 4 6k R 5 D 10 V o V i0 2. Design AC adapters using: (a) A single-ended transformer with a bridge rectiﬁer (b) A center-tapped transformer with a full-wave rectiﬁer with the following speciﬁcations: Output voltage ( V o ) 5 V Maximum ripple 10% Load current ( I L ) 0 – 500 mA For each case, determine the minimum specs for the diode ( I D,max , I D,avg , reverse breakdown voltage), primary/ secondary ratio of the transformer ( n ), and the capacitance value. Show all your calculations. Simulate your designs
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 03/08/2010 for the course ECEN 325 taught by Professor Silva during the Spring '08 term at Texas A&M.