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Understanding Amplifiers: Two-Port Network Applications and Thevenin's Theorem

This lesson explores the fundamentals of amplifiers, focusing on their representation as two-port networks and the application of Thevenin's Theorem. It provides specific examples, including microphone and cone speaker applications, detailing key parameters like peak current, voltage, and output impedance. The discussion includes how to calculate voltage gain, current gain, and power gain for two-port systems, illustrated with example problems that highlight practical scenarios. Additionally, it covers amplifier biasing for linear operation.

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Understanding Amplifiers: Two-Port Network Applications and Thevenin's Theorem

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  1. Lesson 2Introduction to Amplifiers An Example of Application of Amplifiers Representation as a Two-Port Network

  2. Application of Thevenin’s Theorem:Microphone 5 mA peak 10 kW 50 mV peak To load Microphone 10-kW output impedance 50 mV peak

  3. Application of Thevenin’s Theorem:Cone Speaker 3 amps peak + 24 volts peak _ 8 W Cone speaker 36 watts RMS 8 ohms nominal Pav = ½ Vpk Ipk Vpk = R Ipk

  4. Example of Application of Amplifiers Two-port Network 5 mA peak 3 A peak 10 k W Amplifier 50 mV peak 8 W microphone speaker Voltage amplification > 480 Current amplification > 6 x 105

  5. Example Problem 1 In the two-port system, the power output to an 8 W load is to be 72 W when the signal source produces 110 mV. The source resistance is 10 kW and the input resistance to the two-port is 100 kW. Calculate the voltage gain, the current gain, and the power gain of the two-port.

  6. Example Problem 2 The input voltage to a two-port is vin(t) = 2.5 sin(2000pt+p/6) mV and the output is vout(t) = 10sin(2000pt-2p/3) V. The load resist- ance is 10 W and the input resistance to the two-port is 100 kW. Determine the voltage gain and the current gain.

  7. Amplifier Biasing for Linear Operation

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