Clive W. Humphris

**BASIC OPERATIONAL AMPLIFIERS: Inverting Op-Amp. **

The inverting Op-Amp is the most commonly found configuration. The output has a 180° phase inversion of the input.

Amplifier stage gain is determined by dividing Rf by Rin. Multiply the amplitude of the input by the gain (Av) to find the output amplitude. This can be as peak, peak-to-peak or RMS. value, whichever the input is measured as, even DC levels.

Note the input connection is made to the (-) terminal, signifying it is used as an inverting amplifier. The negative sign of the output voltage also denotes the phase inversion.

Negative signs in electronics do not always mean a negative voltage or current. Usually it's just to show that measurement is opposite to a positive value. For current this would mean it is flowing in the opposite direction.

- Table of Contents
- Interactive eTextbooks
- Basic Electronics
- Conductor And Insulator
- Resistor Value Test
- Simple Dc Circuits
- Types Of Switching
- Variable Voltages
- Ohm's Law
- DC Voltage
- DC Current
- Series and Parallel Resistors
- AC Measurement
- AC Voltage and Current
- AC Theory
- RCL Series
- RCL Parallel
- Capacitance
- Capacitors
- Inductance
- Inductors
- Impedance
- Tuned Circuits
- Attenuators
- Passive Filters
- Active Filters
- Oscillators
- Circuit Theorems
- Complex Numbers
- DC Power
- AC Power
- Silicon Controlled Rectifier
- Power Supply
- Voltage Regulation
- Magnetism
- Electrical Machines
- Transformers
- Three Phase Systems
- Energy Transfer and Cost
- Atomic Structures
- Diode Theory
- Diode Applications
- Transistor Theory
- Bipolar Transistors
- Transistor Configurations
- Active Transistor Circuits
- Field Effect Transistors
- Basic Operational Amplifier
- Op-Amp Theory
- Op-Amp Applications
- Sum and Difference Amplifiers
- Analogue Multi-Meter
- Measurement
- Component Testing
- Area
- Surface Area and Symmetry
- Volume
- Compound Measures
- Geometry
- Motion
- Machines
- Optics
- Number Systems
- Number Conversion
- Number Types
- Roots
- Angles and Parallels
- Triangle Ratios
- Triangle Angles
- Percentages
- Ratios
- Fractions
- Vectors
- Circle Angles
- Laws
- Algebra 0
- Algebra 1
- Algebra 2
- Mathematical Rules
- Powers and Indices
- Simplifying
- Linear Equations
- Graphing
- Slope and Translation
- Curves and Angle Conversion