UNIVERSAL COLLEGE OF ENGG. AND TECH. ANALOG ELECTRONICS

AIM: OP-AMP AMPLIFICATION, DC AND AC AMPLIFIERS, SCALING AND SUMMING AMPLIFIERS Prepared By: Group:- 12 (C) Devansh Dave Parita Bhavsar Guided By: Prof. Kapil Dave

FLOW OF PRESENTATION Op-Amp TERMINOLOGY 741 Op-Amp Schematic Diagram of Op-Amp Inverting Amplifiers Non-Inverting Amplifiers Summing Amplifiers Scaling Amplifiers

OP-AMP Op-Amp-An active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation and integration. High performance linear amplifier that requires a power source to operate.

TERMINOLOGY Gain- Amount of amplification produced by an Op-Amp. Gain is independent from the supply voltage (power given for the Op-Amp to operate). Open-Loop Mode-Function of an Op-Amp when the feedback resistor (R f ) is zero. The Op-Amp operates as a comparator and not as a linear amplifier.

TERMINOLOGY Comparator-Compares the –V and +V inputs to see which is greater and returns a result. Bandwidth-The range of frequency at which an Op-Amp will function. (Ideal = ∞)

TERMINOLOGY Slew Rate (V/µs)- Amount of time it takes for the Op-Amp to step to another voltage level. (Non-Ideal) Input Offset Voltage- Even when there is no input voltage the Op-Amp gives off a small voltage. This can be canceled out by use of the Offset Null pin on the chip. (Non-Ideal) Common Mode Rejection Ratio (CMRR)- Ability of an Op-Amp to reject a signal applied to both inputs simultaneously.

741 OP-AMP Maximum Ratings Supply Voltage±18 V Power Dissipation 500 mW Diff. Input Voltage ±30 V Input Voltage±15 V Operating Temperature0°C to 70°C Characteristics Input Offset Voltage2 to 6 mV Input Resistance.3 to 2 MΩ CMMR70 to 90 dB Bandwidth.5 to 1.5 MHz Slew Rate.5 V/µs INPUT + INPUT - V Output Offset Null + V Offset Null No Connection

Schematic Diagram of 741 OP-AMP

OP-AMP TYPES Op-amp DC AC

DC OP-AMPS In DC op-amps, the output signal changes in response to changes in its DC input levels. A DC amplifier can be inverting, non-inverting or differential. Let us see them in detail

INVERTING OP-AMP Here the inverting circuit diagram of Op-Amp is shown,

INVERTING OP-AMP The input is given to the Inverting terminal of Op-Amp so we get an Inverted output with 180° phase difference and out of phase.

NON-INVERTING OP-AMP

NON INVERTING AMPLIFIER The input signal is given to non-inverting terminal of Op-Amp. The output is without any phase difference and in phase to input.

DIFFERENTIAL AMPLIFIER If R 1 = R 2 and R f = R g :

DIFFERENTIAL AMPLIFIER It amplifies the difference between two voltages but does not amplify the particular voltages. Where V in + and V in - are the input voltages and A d is the differential gain

SUMMING AMPLIFIER

SCALING AMPLIFIER

REFERENCES Ramakant A Gayakwad, Op-Amps and Linear integrated circuits, Prentice Hall of India K.R.Botkar, Integrated Circuits, Khanna Publishers

THANK YOU