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+{
+"cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 3: Op Amp With Negative Feedback"
+ ]
+ },
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.10: Inverting_op_amp.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.10\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"R_F = 1;// in M ohm\n",
+"R_F = R_F * 10^6;// in ohm\n",
+"Av= -30;\n",
+"R1 = R_F/abs(Av);// in ohm\n",
+"R1 = R1 * 10^-3;// in k ohm\n",
+"disp(R_F*10^-6,'The value of R_F in MΩ is : ')\n",
+"disp(R1,'The value of R1 in kΩ is');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.11: Inverting_op_amp.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.11\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A_v = -8;\n",
+"V_in= -1;// in V\n",
+"I1 = 15;// in µA\n",
+"I1 = I1 * 10^-6;// in A\n",
+"R1 = -(V_in)/I1;// in ohm\n",
+"R1 = R1 * 10^-3;// in k ohm\n",
+"disp(R1,'Minimum value of R1 in kΩ is');\n",
+"R_F = -(A_v)*R1;// in k ohm\n",
+"disp(R_F,'The minimum value of R_F in kΩ is');\n",
+"\n",
+"// Note: There is calculation error in the book to find the value of R_F so the answer in the book is wrong."
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.1: Closed_loop_voltage_gai.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.1\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A = 2*10^5;\n",
+"R_F = 4.7*10^3;// in ohm\n",
+"R1 = 470;// in ohm\n",
+"K = R_F/(R1+R_F);\n",
+"B = R1/(R1+R_F);\n",
+"A_F = -(A*R_F)/(R1+R_F+(R1*A));\n",
+"disp(A_F,'The closed loop voltage gain is');\n",
+"R_in = 2;// in M ohm\n",
+"R_in = R_in * 10^6;// in ohm\n",
+"R_inf = R1 + ( (R_F*R_in)/(R_F+R_in + (A*R_in)) );// in ohm\n",
+"disp(R_inf,'Input resistance in Ω is');\n",
+"R_o = 75;// in ohm\n",
+"R_of = R_o/(1+(A*B));// in ohm\n",
+"R_of = R_of * 10^3;// in mΩ\n",
+"disp(R_of,'Output Resistance in mΩ is');\n",
+"f_o = 5;// Hz\n",
+"f_f = f_o*(1+(A*B));// in Hz\n",
+"f_f = f_f *10^-3;// in kHz\n",
+"disp(f_f,'Band width with feedback in kHz is');\n",
+"\n",
+"// Note: In the book, the unit of output resistant is wrong it will be mΩ (not MΩ)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.2: Inverting_op_amp.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// EXa 3.2\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A_F = -30;\n",
+"R_F = 1;// in M ohm\n",
+"R1 = -(R_F/A_F);// in Mohm\n",
+"R_i = R1;// in Mohm\n",
+"disp(R_i*10^3,'Input resistance in kΩ is');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.4: Feedback_resistance.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.4\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A_F = 61;\n",
+"R1 = 1;// in k ohm\n",
+"R1 = R1 * 10^3;// in ohm\n",
+"R_F = (A_F-1)*R1;// in ohm\n",
+"R_F = R_F * 10^-3;// k ohm\n",
+"disp(R_F,'The value of feedback resistance in kΩ is');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.5: Closed_loop_gain_and_input_resistance.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.5\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A = 2*10^5;\n",
+"R1 = 1;// in k ohm\n",
+"R1 = R1 *10^3;// in ohm\n",
+"R_F = 10;// in k ohm\n",
+"R_F = R_F * 10^3;// in ohm\n",
+"B = R1/(R1+R_F);\n",
+"R_i = 2;// in M ohm\n",
+"R_i = R_i * 10^6;// in ohm\n",
+"R_o = 75;// in ohm\n",
+"A_F = A/(1+(A*B));\n",
+"disp(A_F,'The closed loop gain is');\n",
+"R_if = R_i * (1+(A*B));// in ohm\n",
+"disp(R_if*10^-9,'Input resistance in GΩ is');\n",
+"R_of = R_o/(1+(A*B));// in ohm\n",
+"R_of = R_of * 10^3;// in mΩ\n",
+"disp(R_of,'The output resistance in mΩis');\n",
+"f_o = 5;// in Hz\n",
+"f_f = f_o*(1+(A*B));// in Hz\n",
+"f_f = f_f * 10^-3;// in kHz ... correction....\n",
+"disp(f_f,'Bandwidth with feedback in kHz is');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.6: Voltage_gain_and_input_resistance.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.6\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A =2*10^5;\n",
+"R_i = 2;// in M ohm\n",
+"R1 = 1;// in ohm \n",
+"R_o= 75;// in ohm\n",
+"R_F = 1;// in ohm\n",
+"B = R1/(R1+R_F);\n",
+"A_F = -1;\n",
+"disp(A_F,'The voltage gain is ');\n",
+"R_if = 330;// in ohm\n",
+"disp(R_if,'Input resistance in Ω is');\n",
+"R_of = R_o/(A/2);// in ohm\n",
+"disp(R_of,'Output resistance in Ω is');\n",
+"f_o = 5;// in Hz\n",
+"f_F = (A/2)*f_o;// in Hz\n",
+"f_F = f_F * 10^-6;// in MHz\n",
+"disp(f_F,'The bandwidth in MHz is');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.7: Value_of_Af_Rif_RoF_and_fF.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.7\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"A = 2*10^5;\n",
+"R_i = 2;//in M ohm\n",
+"R_i = 2*10^6;// in ohm\n",
+"R_o = 75;//in ohm\n",
+"f_o = 5;// in Hz\n",
+"V_CC = 15;// in V\n",
+"V_EE = -15;// in V\n",
+"R1 = 1;// in k ohm\n",
+"R1 = R1 * 10^3;// in ohm\n",
+"R_F = 10;// in k ohm\n",
+"R_F = R_F * 10^3;// in ohm\n",
+"OVS= 13;// output voltage swing in V in ±\n",
+"B = R1/(R1+R_F);\n",
+"A_B = A*B;\n",
+"A_B1 = 1+(A*B);\n",
+"A_F = (1+(R_F/R1));\n",
+"disp('Part (i) For non-inverting amplifier')\n",
+"disp(A_F,'The value of A_F is');\n",
+"R_iF = R_i * (A_B1);// in ohm\n",
+"disp(R_iF*10^-9,'The value of R_iF in GΩis');\n",
+"R_OF = R_o/(A_B1);// in ohm\n",
+"disp(R_OF,'The value of R_OF in ohm is');\n",
+"f_F = f_o*A_B1;// in Hz\n",
+"f_F =f_F * 10^-3;// in kHz\n",
+"disp(f_F,'The value of f_F in kHz is');\n",
+"V_ooT= OVS/(1+A*B);// in V\n",
+"disp('The value of VooT is ±'+string(V_ooT)+' V or ±'+string(V_ooT*10^3)+' mV')\n",
+"\n",
+"disp('Part (ii) For inverting amplifier')\n",
+"R_F = 4.7;// in k ohm\n",
+"R_F = R_F* 10^3;// in ohm\n",
+"R_1 = 470;// in ohm\n",
+"A_F = -(R_F)/R_1;\n",
+"disp(A_F,'The value of A_F is');\n",
+"R_iF = R_1// in ohm\n",
+"disp(R_iF,'The value of R_iF in Ω is');\n",
+"R_OF = R_o/(A_B1);// in ohm\n",
+"disp(R_OF,'The value of R_OF in Ω is');\n",
+"f_F = f_o*A_B1;// in Hz\n",
+"f_F =f_F * 10^-3;// in kHz\n",
+"disp(f_F,'The value of f_F in kHz is');\n",
+"V_ooT = OVS/A_B1;// in mV\n",
+"disp('The value of VooT is ±'+string(V_ooT)+' V or ±'+string(V_ooT*10^3)+' mV')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.8: Voltage_gain_and_input_output_resistance.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// EXA 3.8\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"R1 = 5;// in k ohm\n",
+"R_F = 500;// in k ohm\n",
+"V_in = 0.1;// in V\n",
+"A_F = -(R_F/R1);\n",
+"disp(A_F,'Voltage gain is');\n",
+"R_i = R1;// in k ohm\n",
+"disp(R_i,'The Input resistance in kΩ is');\n",
+"R_o = 0;// in ohm\n",
+"disp(R_o,'Output resistance in Ω is');\n",
+"V_out = A_F*V_in;// in V\n",
+"disp(V_out,'Output voltage in V is');\n",
+"I_in = V_in/(R1*10^3);// in A\n",
+"I_in = I_in * 10^3;// in mA\n",
+"disp(I_in,'Input current in mA is');"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 3.9: Input_impedance_voltage_gain_and_power_gain.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"// Exa 3.9\n",
+"clc;\n",
+"clear;\n",
+"close;\n",
+"// Given data\n",
+"R_F = 1;// in M ohm\n",
+"R_in = 1;// in M ohm\n",
+"V_in = 1;// in V (assumed)\n",
+"V_out = -(R_F/R_in)*V_in;\n",
+"A_v = V_out/V_in;\n",
+"disp(A_v,'The value of A_v is');\n",
+"I_in = 1;// in A\n",
+"I_out = I_in;// in A\n",
+"A_in = I_out/I_in;\n",
+"disp(A_in,'The value of A_in is');\n",
+"A_P = abs(A_v*A_in);\n",
+"disp(A_P,'The value of A_P is');"
+ ]
+ }
+],
+"metadata": {
+ "kernelspec": {
+ "display_name": "Scilab",
+ "language": "scilab",
+ "name": "scilab"
+ },
+ "language_info": {
+ "file_extension": ".sce",
+ "help_links": [
+ {
+ "text": "MetaKernel Magics",
+ "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+ }
+ ],
+ "mimetype": "text/x-octave",
+ "name": "scilab",
+ "version": "0.7.1"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
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