HomeworkAssignment04Solution

# In other words why is it important to know the ripple

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: le rejection this at these particular frequencies? (3 points) Answer: The frequency of a full-wave rectified since wave is twice that of the original since wave. For mains power supplies the input is 50—60 Hz so the output is 100—120 Hz. Thus, the performances of three-terminal regulators and filter capacitors at these are of interest to designers. Problem 6 Each of the circuits below has a serious flaw. Identify and briefly describe the serious them. (6 points) (a) (b) Circuit (a): One cannot generate a negative voltage using the 7915 regulators as the figure suggest. Circuit (b): There is no smoothing capacitor after the bridge rectifier 9 55:041 Electronic Circuits. The University of Iowa. Fall 2011. Problem 7 Modern three-terminal linear voltage regulators are very easy to use, and a great boon to designers. However, a caveat with most of these regulators is that they require two capacitors and (see below) for reliable operation. (6 points) (a) Explain the purpose of and . (b) If these capacitors are so important, then why don’t IC manufacturers integrate them into their regulators? (a) The regulator is a control system that monitors the output and makes adjustments as the input (line) voltage or output (i.e., load) voltages fluctuate. These capacitors ensure stability of this control system. (b) Capacitors values of — are too large to integrate into ICs. They will consume too much IC ―real-estate‖...
View Full Document

## This note was uploaded on 10/26/2013 for the course ECE 55:041 taught by Professor Kruger during the Fall '11 term at University of Iowa.

Ask a homework question - tutors are online