Integrator
Aim
To design and simulate an Integrator circuit.
Components
Name

EDWin Components Used 
Description 
Number of components
required 
RES 
RC05 
Resistor 
1 
CAP 
CASEA600 
Capacitor 
1 
VGEN 
VGEN 
Ac voltage source 
1 
GND 
SPL0 
Ground 
1 
Theory
A circuit in which output voltage is directly proportional to the integral of the input
is known as an integrating circuit. An integrating circuit is a simple RC series circuit with output taken across the Capacitor C.
In order that circuit renders good integration, the following conditions should be fullfilled.
 The time constant RC of the circuit should be
very large compared to the time period of the input wave.
 The value of R should be 10 or more times larger than Xc.
Let e_{i }be the input alternating
voltage and let i be the resulting alternating current. Since R is very large compared to capacitive reactance Xc of
the capacitor, it is reasonable to assume that the voltage across R(i.e. e
_{R}) is equal to the input voltage.i.e.
The charge on the capacitor at any instant is
output voltage,
(RC is
constant)
Thus the output is proportional to the time integral of the input.
Procedure
EDWinXP > Schematic Editor: The circuit diagram is drawn by loading components
from the library. Wiring and proper net assignment has been made.
The values are assigned for relevant components.
EDWinXP > Mixed Mode Simulator: The circuit is preprocessed. Waveform markers are placed in
input and output of the circuit. GND net is set as reference net. The Transient Analysis parameters have been
set. The Transient Analysis is executed and output waveform is observed in
the Waveform Viewer.
Result
The output waveform may be observed in the waveform viewer.