ECE 320 Lab 6 -UL

ECE 320 Lab 6 -UL - Experiment#6 The Cascode Amplifier...

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Experiment #6 The Cascode Amplifier Executive Summary: In this lab, we increased the performance of the frequency response of the BJT transistor by Cascode configuration. Cascode configuration is built by combining Common Emitter and Common Base configuration. The Common Emitter configuration has a voltage gain of -1. As a result the miller effect does not affect the high frequency gain much. This configuration amplifies the current which drives the CB configuration. The CB configuration actually amplifies the voltage, but due to its configuration, the miller capacitance cancels out (the miller capacitance becomes negative). The upper cutoff frequencies improved from 200 KHz (Single BJT CE configuration) to 400 KHz; pretty much doubled up the higher frequency response. There is not much effect on the lower cutoff frequency. This configuration has a higher input and output impedances. The input impedance was calculated 3.52 KΩ and the output impedance was 4.32 KΩ. This configuration has higher input-output isolation. Objective: The objective of this experiment is to study the dc and ac characteristic of a BJT Cascode amplifier. DC biasing point, voltage gain, and high frequency response of the Cascode amplifier
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This note was uploaded on 01/30/2012 for the course ECE ECE320 taught by Professor Mittskus during the Spring '11 term at Cal Poly Pomona.

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ECE 320 Lab 6 -UL - Experiment#6 The Cascode Amplifier...

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