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Lesson 2 Introduction to Amplifiers

Lesson 2 Introduction to Amplifiers. An Example of Application of Amplifiers Representation as a Two-Port Network. Application of Thevenin’s Theorem: Microphone. 5 m A peak. 10 k W. 50 mV peak. To load. Microphone 10-k W output impedance 50 mV peak.

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Lesson 2 Introduction to Amplifiers

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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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