# Electronic Devices and Amplifier Circuits with MATLAB by Steven T Karris

By Steven T Karris

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Extra info for Electronic Devices and Amplifier Circuits with MATLAB Computing, Second Edition

Sample text

707 and these two points are known as the 3−dB down or half− power points. • The low−pass and high−pass filters have only one cutoff frequency whereas band−pass and band−stop filters have two. We may think that low−pass and high−pass filters have also two cutoff frequencies where in the case of the low−pass filter the second cutoff frequency is at ω = 0 while in a high−pass filter it is at ω = ∞ . • We also recall also that the output of circuit is dependent upon the frequency when the input is a sinusoidal voltage.

Amplifiers are often represented by equivalent circuits also known as circuit models. The common types are the voltage amplifier, the current amplifier, the transresistance amplifier, and the transconductance amplifier. 12 Exercises 1. 1, derive and sketch the magnitude and phase responses for an RC high−pass filter. 2. Derive the transfer function G ( s ) for the network shown below. 5 H + − + C v in ( t ) + 1F 1 Ω v out ( t ) R − − 3. A system has poles at – 4 , – 2 + j , – 2 – j , and zeros at – 1 , – 3 + j2 , and – 3 – j2 .

The gain of an amplifier is the ratio of the output to the input. Thus, for a voltage amplifier VoltageVoltage Gain = Output ---------------------------------------Input Voltage or Electronic Devices and Amplifier Circuits with MATLAB Computing, Second Edition Copyright © Orchard Publications 1−21 Chapter 1 Basic Electronic Concepts and Signals G v = V out ⁄ V in The current gain G i and power gain G p are defined similarly. • The ratio of any two values of the same quantity (power, voltage or current) can be expressed in decibels (dB).