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Unformatted text preview: EECS 70LB Lab 6 First-Order and Second-Order Circuits--- RC and RCL transient response Objective: To study the step response of first order circuits Equipment: Oscilloscope Function Generator Inductor Potentiometer Capacitor Part I: First-Order Circuits: Series RC circuit Background: Fig1.a Consider the series RC circuit in Fig.1.a. The capacitor voltage is given by: / ( ) (1 ), t t RC c V t V e- =- The current in the loop can be found to be: / ( ) , t t RC V i t e R = Fig1.b Rs C R ( ) c V t ( ) in V t ( ) i t Signal Generator Square wave 0 ~ V0 50% duty cycle ( ) V t t Ti me 0s 5us 10us 15us 20us 25us 30us 35us 40us 45us 50us 55us 60us V(C:2) 0V 2. 5V 5. 0V I (C)- 4. 0mA 0A 4. 0mA SEL>> V(V2: +) 0V 2. 5V 5. 0V ( ) c V t t ( ) i t t Time constant Fig1.c Prelab: 1. Calculation: a. Consider the circuit in Fig 1. The square wave has amplitudes 5 V, 50% duty cycle (which means the pulse width is half of its period), frequency of 100 kHz. The built-in resistor Rs of function generator is 50 Ohm. The value of capacitor C is 1nF. Find the value of resistor R so that the time constant of this RC circuit is less than 1/10 of the pulse width....
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This note was uploaded on 02/06/2012 for the course EECS 70B taught by Professor Henrylee during the Spring '08 term at UC Irvine.
- Spring '08