Texas Instruments SLOU061A manual Schematic Conventions, Inverting Amplifier

Schematic Conventions

3.1 Schematic Conventions

Figures 3–1 through 3–6 show schematic examples of circuits that can be constructed using the universal operational amplifier EVM with shutdown. The components that are placed on the board are shown in bold. Unused components are blanked out. Jumpers and other changes are noted. These examples are only a few of the many circuits that can be built.

3.2 Inverting Amplifier

Figure 3–1 shows area 100 equipped with a single operational amplifier configured as an inverting amplifier using dual power supplies.

Basic setup is done by choice of input and feedback resistors. The transfer function for the circuit as shown is:

VOUT +*VIN R112R109

To cancel the effects of input bias current, set R105 = R112 R109, or use a 0-Ωjumper for R105 if the operational amplifier is a low input bias operational amplifier.

Figure 3–1. Inverting Amplifier With Dual Supply Using Area 100

		V1+
			R110
V1+			A101–
C107	C108		R109
0.1 ∝ F	10 ∝ F
			A102–
GND1
			R103
C105	C104		A103+
			R102
0.1 ∝ F	10 ∝ F
			+A104–
V1–
			Vin
Power Supply Bypass		V1–	–

R114		C110
C109		R112
				R112
		V1+		VOUT = –VIN R109
			8
	2	7		SD
R104		–	6	A OUT
	3
		+	U101
		4
		V1–		R105 = R112 II R109,
				or Short if Using Low
				Input Bias Op Amp
C101		R105		R106
				A1 FLT

R111

V1+

R108

VREF1

C

C102 C103

2

– 6

3 + 5

1

R

C106

U102

Optional R107

100 k

A

R113

Voltage Reference Not Used

R101

5.6 k

V1–

3-2 Example Circuits