NPN Common Amplifier Circuit Design LTSpice analysis if possible Design an AC-co
ID: 2073021 • Letter: N
Question
NPN Common Amplifier Circuit Design
LTSpice analysis if possible
Design an AC-coupled common emitter amplifier with a gain of 10 and a lower frequency limit of 100 Hz. The amplifier will operate from a 15V power supply and the collector should be biased to 7.5V. The signal source will be a 50-ohm function generator. Make sure that the input impedance of the amplifier is at least 10 times greater than the source impedance. Use an NPN 2N3904 transistor. The amplifier will drive a 10k load resistor. Simulate your schematic with a transient analysis showing input and output Use a small input signal around 100 mV and show that the gain is around 10. Simulate your schematic with an AC analysis showing that the lower corner frequency is near 100 Hz.Explanation / Answer
NPN Common Collector Amplifier
The common collector amplifier, often called an emitter follower since its output is taken from the emitter resistor, is useful as an impedance matching device since its input impedance is much higher than its output impedance. It is also termed a "buffer" for this reason and is used in digital circuits with basic gates.
we want to "amplify" the very small electrical signals in the cockroach nerves. Let's aim for a "gain" of 10, or increasing the amplitude of the signal 10 times. We also want to limit what we amplify to ensure we are only paying attention to spikes (action potentials) and not other electrical signals like electrical noise from your house. So, like the real SpikerBox, we only want to measure signals with components above 300 Hz (cycles per second). This is also called "high-passing" the signal.
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