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amplifier_gallery - A Gallery of Amplifier Circuits ECE137A...

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1 A Gallery of Amplifier Circuits ECE137A, March 2, 1995 The text is a good complement to the lecture notes, but has one major weakness: most of the circuits in the text are very simple, on a quite tutorial level. One can learn a lot by looking through a catalog of IC designs for various purposes, looking at the structure of real solid-state circuits. The old National Semiconductor Linear Applications Handbooks are great for this purpose, if you can find them (you might ask the electronics shop for a hint on this). In the same spirit, below are a bunch of circuits taken from ECE137A/B problem sets over the years. This is not an assignment, you dont need to work the problems ...but the listing might be a good study guide for the final, and is certainly intended as a list of hints and tricks for the lab assignment. IC-like Operational Amplifiers The circuits in this section are true op-amps, having the following important parameters. High or very high DC voltage gain. High common-mode rejection ratio. Low or very low output impedance. Big maximum peak-peak output voltage swings, within 1- 2 volts of the power supply voltage. Operation over a wide range of DC power supply voltages with only moderate changes in circuit characteristics. It would be instructive to work out the voltage gain, CMRR, and maximum signal swing for these circuits Basic IC OP-AMP -Vee +Vcc -Vee 29 kž 42ž C c In the op-amp circuit to the right, all NPN transistors have ß=100 and Va=100 Volts. All PNP devices have ß=50 and Va=75 Volts. Load resistance of 1000 , The power supplies are ±15 Volts. The compensation capacitor is quite important: see other notes. As in all high-gain amplifiers intended for use with negative feedback, bias analysis can be a little tricky. Work from assumption that the DC output voltage (bias condition) is zero volts: this is generally what the negative feeback network will force.
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2 IC OP-AMP with Darlington Gain Stage -Vee 50k 280k 10ž 10ž 10ž 50ž 50ž Same transistor parameters as above. The darlington stage (e.g. the added emitter follower) increases the equivalent load impedance for the first (differential) stage, increasing its voltage gain.
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