Op_Amp_Openloop_Operation_with_fixed_positive_regulated_Vref_in_MATLAB

An op amp comparator outputs + Vsat when when voltage at non-inverting input exceeds the voltage at the inverting input and outputs -Vsat when the voltage at inverting input exceeds the voltage at the non-inverting input.

Check this fixed positive regulated open loop operation on op amp. The simulation in MALAB is as...

Properties of components used in circuit is as...

AC Voltage Source: 

Peak amplitude: 10 V

Phase Shift: 0 rad.

Frequency: 5 hz.

Finite Gain Op Amp:

Gain : 10

Rin = 10^6 ohm

Rout = 100 ohm

Vmin = -15 V

Vmax = +15V

Resistor:

R = 1 kOhm

Diode:

Vforward = 1 V

Ron = 0.3 ohm

Goff = 10^(-8) 1/ohm

DC Voltage Source :

1 V

Let the time period of simulation response be 2 seconds.

Now let us change the value of Resistor R = 10000 kohm. The response changes as ....

Now let the R = 1 k ohm and DC Voltage Source voltage be = 5 volt , the response changes as ....

Now when Vdc = 8 V then response changes to .....

and when Vdc = 9 V response change to ......

and when Vdc = 10 V response becomes.....

this is how op amp behaves for positive fixed regulated reference DC voltage in open loop operation.

(su317)


Rest of the details about simulink you can find below.

Op_Apm_open_loop_operation_With_fixed_Positive_Rgulated_Vref

$hiv

11-Oct-2013 07:54:45

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Table of Contents

Model - Op_Apm_open_loop_operation_With_fixed_Positive_Rgulated_Vref

System - Op_Apm_open_loop_operation_With_fixed_Positive_Rgulated_Vref

Appendix

List of Tables

1. AC Voltage Source Block Properties

2. DC Voltage Source Block Properties

3. Diode Block Properties

4. Electrical Reference Block Properties

5. Finite Gain Op-Amp Block Properties

6. PS-Simulink Converter Block Properties

7. Resistor Block Properties

8. Solver Configuration Block Properties

9. Voltage Sensor Block Properties

10. Block Type Count

Model - Op_Apm_open_loop_operation_With_fixed_Positive_Rgulated_Vref

Full Model Hierarchy

1. Op_Apm_open_loop_operation_With_fixed_Positive_Rgulated_Vref

Simulation Parameter	Value
Solver	ode45
RelTol	1e-3
Refine	1
MaxOrder	5
ZeroCross	on

[more info]

System - Op_Apm_open_loop_operation_With_fixed_Positive_Rgulated_Vref

Table 1. AC Voltage Source Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	Amp	Amp unit	Shift	Shift unit	Omega	Omega unit	I Log	V Log	Local Var Names	Local Var Descs	Local Var Logging
AC Voltage Source	foundation.electrical.sources.ac_voltage	foundation.electrical.sources.ac_voltage	ac_voltage	ac_voltage	1	10	V	0	rad	5	Hz	off	off	|i|v	|i|v	[0 0]

Table 2. DC Voltage Source Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	V0	V0 unit	I Log	V Log	Local Var Names	Local Var Descs	Local Var Logging
DC Voltage Source	foundation.electrical.sources.dc_voltage	foundation.electrical.sources.dc_voltage	dc_voltage	dc_voltage	1	1	V	off	off	|i|v	|i|v	[0 0]

Table 3. Diode Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	Vf	Vf unit	Ron	Ron unit	Goff	Goff unit	I Log	V Log	Local Var Names	Local Var Descs	Local Var Logging
Diode	foundation.electrical.elements.pwl_diode	foundation.electrical.elements.pwl_diode	pwl_diode	pwl_diode	1	1	V	0.3	Ohm	1e-8	1/Ohm	off	off	|i|v	|i|v	[0 0]

Table 4. Electrical Reference Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	I Log	Local Var Names	Local Var Descs	Local Var Logging
Electrical Reference	foundation.electrical.elements.reference	foundation.electrical.elements.reference	reference	reference	1	off	|i	|i	0
Electrical Reference1	foundation.electrical.elements.reference	foundation.electrical.elements.reference	reference	reference	1	off	|i	|i	0
Electrical Reference2	foundation.electrical.elements.reference	foundation.electrical.elements.reference	reference	reference	1	off	|i	|i	0
Electrical Reference3	foundation.electrical.elements.reference	foundation.electrical.elements.reference	reference	reference	1	off	|i	|i	0

Table 5. Finite Gain Op-Amp Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	A	A unit	Rin	Rin unit	Rout	Rout unit	Vmin	Vmin unit	Vmax	Vmax unit	Local Var Logging
Finite Gain Op-Amp	elec.integrated_circuits.finitegain_opamp	elec.integrated_circuits.finitegain_opamp	finitegain_opamp	finitegain_opamp	1	10	1	1e+6	Ohm	100	Ohm	-15	V	15	V	[]

Table 6. PS-Simulink Converter Block Properties

Name	Unit	Affine Conversion
PS-Simulink Converter	1	off

Table 7. Resistor Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	R	R unit	I Log	V Log	Local Var Names	Local Var Descs	Local Var Logging
Resistor	foundation.electrical.elements.resistor	foundation.electrical.elements.resistor	resistor	resistor	1	1	kOhm	off	off	|i|v	|i|v	[0 0]

Table 8. Solver Configuration Block Properties

Name	Do DC	Residual Tolerance	Use Local Solver	Local Solver Choice	Local Solver Sample Time	Do Fixed Cost	Max Nonlin Iter	Max Mode Iter	Linear Algebra	Accelerate	Profile	Use Local Sampling	Delays Memory Budget
Solver Configuration	off	1e-9	off	NE_BACKWARD_EULER_ADVANCER	.001	off	3	2	Sparse	off	off	off	1024

Table 9. Voltage Sensor Block Properties

Name	Component Path	Component Variants	Component Variant Names	Class Name	Schema Version	I1 Log	V1 Log	Local Var Names	Local Var Descs	Local Var Logging
Voltage Sensor	foundation.electrical.sensors.voltage	foundation.electrical.sensors.voltage	voltage	voltage	1	off	off	|i1|v1	|i1|v1	[0 0]

Appendix

Table 10. Block Type Count

BlockType	Count	Block Names
Electrical Reference (m)	4	Electrical Reference, Electrical Reference1, Electrical Reference2, Electrical Reference3
Voltage Sensor (m)	1	Voltage Sensor
Solver Configuration (m)	1	Solver Configuration
Scope	1	Scope
Resistor (m)	1	Resistor
PS-Simulink Converter (m)	1	PS-Simulink Converter
Finite Gain Op-Amp (m)	1	Finite Gain Op-Amp
Diode (m)	1	Diode
DC Voltage Source (m)	1	DC Voltage Source
AC Voltage Source (m)	1	AC Voltage Source

Open Loop Operation of Op Amp

An open loop operation of op amp which is hardly seen used this way can be studied in MATLAB with it's responses.
                                                          
An op amp can have open loop gain equal to 10^5.

The MATLAB simulation circuit which can be used is .....

This circuit can be drawn in MATLAB in it's model. MATLAB's model can approached by using
"Alt + F + M " on command window of the MATLAB. In order to get above used components you have to surf  "Simulink Library Browser" of MATLAB, for which all you need to do is to type 'simulink' in your MATLAB command window.

Simulating the above circuit we get a beautiful response in the Scope as...

Let the time period of simulation be set to 1 second and gain A be set to 10. Change the values of gain A to see change in response.