inverting opamp

OP-AMP An operational amplifier (op amp) is an analog circuit block that takes a differential voltage input and produces a single-ended voltage output. It is a DC-coupled high-gain electronic voltage amplifier. Op amps usually have three terminals: two high-impedance inputs and a low-impedance output port. The inverting input is denoted with a minus (-) sign, and the non-inverting input uses a positive (+) sign. Operational amplifiers had their origins in analog computers, where they were used to perform mathematical operations in linear, non-linear, and frequency-dependent circuits. Typical uses of the operational amplifier are to provide voltage amplitude changes (amplitude and polarity), oscillators, filter circuits, and many types of instrumentation circuits. An op-amp contains a number of differential amplifier stages to achieve a very high voltage gain. An ideal op-amp circuit, should have infinite input impedance, zero output impedance, and infinite voltage gain. Schematic Symbol An Op-Amp basically has two inputs and one output. Each input results in either the same or an opposite polarity (or phase) output, depending on whether the signal is applied to the plus (+) or the minus (-) input, respectively. An inverting operational amplifier built by using an op-amp and two resistors. Op-Amp Pin Configuration APEKSHA SHAH 21BCP245 INVERTING AMPLIFIER An inverting amplifier (also known as an inverting operational amplifier or an inverting op-amp) is a type of operational amplifier circuit which produces an output which is out of phase with respect to its input by 180°. Thus if the input pulse is positive, then the output pulse will be negative and vice versa. It is the most widely used constant-gain amplifier circuit is the inverting amplifier because it has better frequency stability. The output is obtained by multiplying the input by a fixed or constant gain, set by the input resistor ( R 1 ) and feedback resistor ( R f )—this output also being inverted from the input. The output voltage is expressed as, V0 = - (Rf / R1) V NON-INVERTING AMPLIFIER In this configuration, the input voltage signal, ( VIN ) is applied directly to the non-inverting ( + ) input terminal which means that the output gain of the amplifier becomes “Positive” in value in contrast to the “Inverting Amplifier” circuit. This op amp has two input terminals (pins). One is inverting denoted with a minus sign (-), and other is non-inverting denoted with a positive sign (+). The voltage gain of this circuit is expressed as,