The output signal may be of the same form as the input signal, i.e. V in produces V out


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1 What is an amplifier? Operational Amplifiers A device that takes an input (current, voltage, etc.) and produces a correlated output Input Signal Output Signal Usually the output is a multiple of the input The output signal may be of the same form as the input signal, i.e. produces V out However, the input and output may be of different forms, i.e. I in produces V out For any form of amplifier, the amplifier gain is defined generically as gain = signal in/signal out There are many forms of amplifiers possible, and the design of specific forms for discrete component amplifiers is an involved process. We will not discuss the general design of transistor/tube/etc. amplifiers, but only the use and properties of the much simpler integrated circuit amplifier. Spending a few dollars on an integrated circuit device allows one to buy the results of hundreds of thousands of developer dollars and manyears of development time. The simplest form of such amplifiers to use is the Operational Amplifier! Operational Amplifiers What is an operational amplifier? A very high gain DC amplifier that uses external feedback networks to control its response Notice particularly that the external network connected to the IC device determine the characteristics of the amplifier constructed! An PerfectOperational Amplifier is a device with certain special characteristics 1. infinite openloop gain A ol 2. infinite input resistance R in 3. zero output resistance R out 4. infinite bandwidth 5. zero offset (output is exactly 0 when the input is 0) Clearly no real operational amplifier can meet all these characteristics. However, under certain conditions, most of these conditions can be approximately met  though not all at once. A diagram representing a generalized operational amplifier is given below R R 0 in v i A ol v i A ol V+ R out V V out Vout R in is the input resistance of the op amp, R out is the output resistance, and A olv in represents the active amplification effect of the amplifier in terms of the input voltage v in. The output voltage V out is determined by the combination of open loop gain ( A ol ) and output resistance (R out ). Typical values of these quantities for a standard 741 operational amplifier would be: R in = 2 MΩ R out = 75 Ω A ol = 200,000 In using an operational amplifier, one needs to be aware of certain information about the device that can usually be obtained from the DATA SHEET for the particular amplifier. Maximum Ratings (exceeding these can destroy the device) 1. Supply Voltage (± Vs ) : maximum bipolar (±) voltage that can be used to power the amp 2. Internal Power Dissipation (PD) : maximum power that can be dissipated internally by the op amp without exceeding a specified max temperature. e.g. 500 < 75 C 3. Differential Input Voltage (Vid ) : maximum voltage that can exist across + and  inputs 4. Operating Temperature (Ta) : maximum safe temperature of operation 5. Outout ShortCircuit Duration : maximum length of time that the output could be shorted to either ground or to ±Vs.. For many op amps this is infinite. There are many other specifications for op amps that are important for their use, but which do run the risk of destruction if exceeded. One other characteristic of perfect op amps is the fact of infinite bandwidth (amp operates from DC to frequencies). Real op amps have a finite bandwidth that rolls off with frequency, i.e. the gain at DC is usually > the gain at 40 khz. 1
2 G a i n A typical gainbandwidth curve for a 741 op amp is shown below: 1.E+06 1.E+05 1.E+04 1.E+03 1.E+02 1.E+01 1.E+00 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 frequency Real op amps have a frequency response that is very large at DC (~200,000 for a 741) but begins to "roll off" at higher frequencies. The 741 begins to roll off beginning about 6 to 10 Hz at about 6 db per octave (20 db per decade), reaching a value of unity gain at about 1.0 MHz. Different op amps will have different frequency response curves, but all will have the same general form. For any op amp the GainBandwidth product is approximately constant. As the gain goes up, the bandwidth goes down. There is always a tradeoff between  available gain and the maximum frequencies the amplifier can amplify without significant distortion. In practice operational amplifiers are always operated with some type of feedback, either positive in the case of some oscillators, or negative feedback which greatly stabilizes the amplifier output. In negative feedback, a portion of the output signal is fed back out of phase with the input effectively reducing the total gain but keeping the output stable. fv out V out With negative feedback the gain always decreases, so that the closedloop gain A cl is always < A ol. The loop gain is defined as: loop gain A L = A ol / A cl As mentioned before, the gain bandwidth product is approximately constant GBW = ( A L )( BW) Thus reducing the gain usually increases the bandwidth of the amplifier. Since op amps have such a high openloop gain, the reduction in gain still allows sufficient gain for most practical purposes Operational amplifiers are usually operated as inverting (meaning the output has the opposite phase as the input) or noninverting (where input and output have the same polarity) amplifiers. Physically this is governed by whether the input signal is applied to the inverting (), or the non inverting (+) input terminals. A diagram for an inverting amplifier The relationship between input voltage and output voltage involves only the external input and feedback resistors V out = A ol = [R f / R i ] Let us now consider some simplified ways of analyzing this operational amplifier configuration Simplifying assumptions for analyzing simple op amp circuits 1. V out is ALWAYS < supply voltage. If V+ = 15 V and V = 15 V, then the maximum possible voltage output from the amplifier is < 15 volts As a consequence of this, consider an op amp with A ol = 200,000 (typical 741), then we see V out = A ol and the input voltage producing max output is = V out / 200,000 = 15 Volts / 200,000 = 75 x 106 V or 75 µ V 2
3 This means that unless one is trying to amplify µv signals, the input voltage is required to drive the amplifier to maximum output is ~ 0 When properly operating, the voltage difference between the(+) and () terminals is ~ 0 2. Since the input resistance of op amps is very high (typ. Megohms), a negligible amount of current flows into the op amp from the input voltage source. For a 741 op amp, the input current draw is typically na. Other op amps such as a CA3140 FET op amp may have input current draws of about 10 pa! (10 x amps) Analysis of an Inverting Amplifier i in S P i in = /R in since S is effectively a ground Based on these two simplifying assumptions, one can make a practical representation of an inverting op amp circuit as shown on next slide. Since no current flows into the op amp terminal at S, the current flow through the feedback resistor is also i in Since no current flows into the op amp terminal Using this, one can write the output voltage as at S, the current flow through the feedback resistor is also i in. V out = R f [ /R in ] or equivalently as The input impedance of an inverting amplifier is given by R in Thus the voltage across the feedback resistor is given by V Rf = i in R f = R f [ /R in ] Since the voltage from terminal P to ground is the same as the voltage from P to S, the output voltage which is measured from P to ground is the same as the voltage across the feedback resistor V Rf. V out =  [R f /R in ] effectively set by the ratio of the feedback resistor to the input resistor. The minus sign is required since the P side of R f is negative compared to the S side. Notice that the external components connected to the op amp ( R f and R in ) determine its characteristics when used as an amplifier The output impedance is approximately [ A CL / A ol ] R out where R out is the output resistance of the operational amplifier chip. Since A ol is much larger than A CL, this makes the output impedance very low. Analysis of a NonInverting Amplifier Since the circuit analysis for a noninverting amplifier is more complicated (see any IC textbook) only the results for this amplifier will be given Since the voltage between the (+) and () inputs to the op amp are essentially zero, the voltage applied to the (+) input and gnd. which is is also the voltage between the () terminal and gnd and consequently also the voltage across the input resistor R in There is a voltage divider circuit formed by the feedback resistor R f and the input resistor R in. This voltage divider sets the equation for the gain. = (V out R in )/( R in + R f ) or V out = ( R in + R f )/ R in The voltage gain for the noninverting amplifier is V out = [1 + R f /R in ] The input impedance is determined by the input resistance of the op amp itself and by the gain ratios. R input = [ A ol / A CL ] R in For a common 741 amplifier, the openloop gain is ~200,000 while the closedloop is ~100 and the amplifier input resistance is 75 Ω. This would give R input = [200,000/100] 75 = 1.5 x 10 6 Ω or 1.5 M Ω 3
4 If we let R f go to zero, and drop R, if we desire, then in the noninverting circuit, we get V out = (1) gain = 1 In this circuit the output voltage exactly follows the input. The input resistance of such a circuit is 150 MΩ NonInverting Buffer or UnitGain Amp Summing Amplifier Such an amplifier serves as a buffer (or isolation) amplifier. With ~ infinite input resistance and ~ 0 output resistance, it does not alter the input signal at all.. Any changes in the output circuit (short circuit, etc.) has no effect on the input circuit. However, such a circuit CAN multiply the POWER by increasing the current which can be drawn (from Op Amp). Op Amps can also be used to perform electronic equivalents of mathematical operations such as integration, differentiation, addition, etc. (see the attached sample circuits). A summing amplifier does a weighted summation of several input voltages The output voltage is given by the weighted sum of the input voltages V out =  [V 1 /R 1 ) + V 2 /R 2 ) + V 3 /R 3 )] The negative sign occurs since this is an inverting circuit. Difference Amplifier Recall that fundamentally, every operational amplifier is a difference amplifier, amplifying the difference between the signals at the inverting () and noninverting (+) inputs. Small variations in the input transistors in the op amp are reflected in the fact that there are small differences in quiescent voltages from the two inputs. One can reduce these differences and increase the op amps CMRR (commonmode rejection ratio) by connecting a variable resistor to one input and adjusting the value of that resistor to null out the output when the same signal is applied to both inputs. The next shows shows the circuit with CMRR adjustment potebtiometer Instrumentation Amplifier A highgain, lowdrift, high input impedance, differential input operational amplifier is usually known as an instrumentation amplifier. These are high performance, higher cost amplifiers, are often used for critical amplification needs in research projects. These amplifiers are basically high quality op amps with voltage follower buffers on each input to produce the desired high input resistance. V out = ( )R f /R in R1 will usually be a value close to R2 4
5 Corrections for REAL Op Amps Input Offset Voltage voltage that must be applied to one of the input terminals to give zero output. offset = V out offset /A cl Input Bias Current current flowing into Op Amp input terminals. Ideally these currents are identical, but actually are not for real devices. However, they are quite small ~ 200 na Both of these can be partially corrected by using the offset terminals of the op amp, if available. Offset Adj. Voltage slew rate time it takes the output of the op amp to switch from max output to minimum output. For the 741 amp, this is about 0.5 V/µsec. This can only be changed by using a different op amp with a different slew rate. For example the LM318 op amp has a slew rate of 70 V/ µsec 5
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