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# Op-Amps

An introduction to the basic elements of Op-amps and simple circuit uses.
by

## Brent Phillips

on 30 January 2013

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#### Transcript of Op-Amps

Operational Amplifiers Op-Amps Ideal Amplifier Amplifier Characteristics Connections: Op-Amp
Open-Loop Response For a positive input voltage ... Including Resistors Op-Amp
Closed-Loop Response Learning Goals a.Describe the function of a general purpose operational amplifier in accordance with industry practice. c.Analyse and design inverting, non-inverting and unity gain buffer op-amp circuits. b.External components are calculated and verified experimentally for various operational amplifier configurations. Real Amplifier infinite gain
infinite input impedance
zero output impedance
equal response to +/- voltage
equal response to all frequencies
instant response to input change
(slew rate) Assume Op-Amps are very close to ideal ...less than these goals +/- DC supply 15 V ground
(or other V ref ) measured signal +/- DC supply 15 V + input = + output
- input = - output Vout = +/- Vss Using no feedback Connections: Op-Amp
Open-Loop Response +/- DC supply 15 V ground measured signal +/- DC supply 15 V + input = - output
- input = + output Vout = +/- Vss Using no feedback Op-Amp
Closed-Loop Response virtual ground What happens to a sine wave input? becomes a square wave output +V on output ... +V on - input ... Vin+ = Vin- ... Vout -> 0 Vin- drops ... Vin+ > Vin- ... Vout increases initial response is Equilibrium Vout = Vin Op-Amp
Closed-Loop Response Including Resistors Resistor values divide the feedback Gain: Av = -R f R in Inverting Practice... Major difference: Vin to +
Non-Inverting Gain: Av = 1 + R 1 R 2 Practice... Op-Amps
other common designs differential (subtracting) adding integrating differentiating neagtive feedback Amplifies Current, not Voltage More listed here : http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/opampvar.html#c1 http://webpages.ursinus.edu/lriley/ref/circuits/node5.html Brent Phillips This Prezi may be used for non-commercial purposes.