Lecture_14 - 1 Operational amplifiers (op-amps) CHM6158C -...

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Unformatted text preview: 1 Operational amplifiers (op-amps) CHM6158C - Lecture 14 Mar 17 Notes from Horowitz, Hill; The Art of Electronics , Chapter 4 Commercially available as integrated circuits (ICs) 2 Definition An op-amp is a DC-coupled high-gain electronic voltage amplifier with a differential input. Typical gain factors (open loop): max 10 5- 10 6 Note and + inputs: + normal input- inverting input 3 Inside of an op-amp Consider as a black box 4 Characteristics 1. High gain (up to 10 6 ) 2. High input impedance (up to 10 12 ) 3. Low output impedance (1-10 ) I out (1-50 mA) 4. Fast (ms - s ns) 5. Cheap and simple 5 Golden rules 1. The output attempts to do whatever is necessary to make the voltage difference between the inputs zero. 2. The inputs draw no current. (cf. characteristic #2) Example : V in = + 1V R 1 = 10k and R 2 = 100k Lets say that output voltage is ground, what would voltage at A be?...
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Lecture_14 - 1 Operational amplifiers (op-amps) CHM6158C -...

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