Lab 23 TF EIM - Revision history

Foretony: /* Power Supply Rejection Ratio */

2011-04-22T20:48:30Z

Power Supply Rejection Ratio

2011-04-22T20:48:20Z

Power Supply Rejection Ratio

2011-04-22T17:34:11Z

2011-04-22T17:10:48Z

Output voltage RMS noise \Delta V_{out}^{RMS}

2011-04-22T17:10:09Z

Output voltage RMS noise \Delta V_{out}^{RMS}

2011-04-20T18:25:15Z

I_{io}

2011-04-20T18:24:48Z

V_{io} and I_{B}

2011-04-15T18:01:00Z

V_{io} and I_{B}

2011-04-15T17:26:27Z

Inverting OP Amp

2011-04-13T04:36:33Z

I_{io}

@@ Line 62: / Line 62: @@
 =Power Supply Rejection Ratio=
-#Set V_{in} = 0.
+#Set <math>V_{in}</math> = 0.
 #Measure <math>\Delta V_{out}</math> while changing <math>\Delta V_{cc}</math>

@@ Line 63: / Line 63: @@
 =Power Supply Rejection Ratio=
 #Set V_{in} = 0.
-#Measure <math>V_{out}</math> while changing <math>V_{cc}</math>
+#Measure <math>\Delta V_{out}</math> while changing <math>\Delta V_{cc}</math>
 =Output voltage RMS noise <math>\Delta V_{out}^{RMS}</math>=

@@ Line 55: / Line 55: @@
 #Adjust the potentiometer  to minimize <math>V_{out}</math> with <math>V_{in}=0</math>.
 #Use a scope to measure the output noise.
 = Capacitors=
@@ Line 78: / Line 91: @@
 #Measure the Gain as a function of the <math>V_{in}</math> frequency and plot it.
 [[Forest_Electronic_Instrumentation_and_Measurement]]

@@ Line 88: / Line 88: @@
 =Output voltage RMS noise <math>\Delta V_{out}^{RMS}</math>=
-Measure the RMS noise in V_{out} when <math>V_{in}</math> = 0 .
+Measure the RMS noise in <math>V_{out}</math> when <math>V_{in}</math> = 0 .
 [[Forest_Electronic_Instrumentation_and_Measurement]]

← Older revision		Revision as of 17:10, 22 April 2011
Line 87:		Line 87:

	=Output voltage RMS noise <math>\Delta V_{out}^{RMS}</math>=		=Output voltage RMS noise <math>\Delta V_{out}^{RMS}</math>=
		+
		+	Measure the RMS noise in V_{out} when <math>V_{in}</math> = 0 .

	[[Forest_Electronic_Instrumentation_and_Measurement]]		[[Forest_Electronic_Instrumentation_and_Measurement]]

@@ Line 44: / Line 44: @@
 Instead of the current <math>I_B</math> we have the current <math>I_{io}</math>
-;<math>V_{out}= -\frac{R_1}{R_2} V_1 + \left ( 1 + \frac{R_1}{R_2}\right)V_{io}  + R_2 I_{io}</math>
+;<math>V_{out}= -\frac{R_2}{R_1} V_1 + \left ( 1 + \frac{R_2}{R_1}\right)V_{io}  + R_2 I_{io}</math>
 Use the same technique and resistors from the previous section to construct 2 equations and 2 unknowns and extract <math>I_{io}</math>, keep <math>V_{in}</math>=0.

@@ Line 28: / Line 28: @@
 = <math>V_{io}</math> and <math>I_{B}</math>=
-;<math>V_{out}= -\frac{R_1}{R_2} V_1 + \left ( 1 + \frac{R_1}{R_2}\right)V_{io}  + R_2 I_B</math>
+;<math>V_{out}= -\frac{R_2}{R_1} V_1 + \left ( 1 + \frac{R_2}{R_1}\right)V_{io}  + R_2 I_B</math>
 Use the above equation and two measurements of <math>V_{out}</math>, <math>R_1</math>, and <math>R_2</math>  to extract <math>V_{io}</math> and <math>I_B</math>.

@@ Line 34: / Line 34: @@
 #measure <math>V_{out}</math> for <math>R_1</math> = 1 k<math>\Omega</math>, <math>R_2</math> = 100 k<math>\Omega</math>, and<math> V_{in}</math>=0 (grounded).
 #measure <math>V_{out}</math> for <math>R_1</math> = 10 k<math>\Omega</math>, <math>R_2</math> = 1 M<math>\Omega</math>, and<math> V_{in}</math>=0 (grounded).
-#You can now construct 2 equations with 2 unknowns <math>V_{out}</math> and <math>I_B</math>.
+#You can now construct 2 equations with 2 unknowns <math>V_{io}</math> and <math>I_B</math>.
 = <math>I_{io}</math>=

@@ Line 12: / Line 12: @@
 Use <math>R_1 = 1k\Omega</math> and <math>R_2 = 10 k\Omega</math> as starting values.
-. Insert a 0.1 <math>\mu</math>F capacitor between ground and both Op Amp power supply input pins.  The Power supply connections for the Op amp are not shown in the above circuit diagram, check the data sheet.
+. Insert a 0.01 <math>\mu</math>F capacitor between ground and both Op Amp power supply input pins.  The Power supply connections for the Op amp are not shown in the above circuit diagram, check the data sheet.
 = Gain measurements=

@@ Line 38: / Line 38: @@
 = <math>I_{io}</math>=
-Now we will put in a pull up resistor R_3 as shown below.
+Now we will put in a pull up resistor <math>R_3= \frac{R_1 R_2}{R_1+R_2}</math>  as shown below.
 [[File:TF_EIM_Lab23a.png | 200 px]]