Apply47Three identical voltage amplifiers with voltage gain 100 are connected incascade. Then determine the overall voltage gain in dB.Apply4P a g e 4 | 13
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41An amplifier is required to amplify the output signal from a transducer thatproduces a constant current of is=1mA at an internal resistance Varyingfrom Rs=1.5kΩ to Rs=10 kΩ. The desired output current is io=0.5A at a loadresistance varying from RL=10Ω to RL=120Ω. The variation in output currentshould be kept within ±3%. Determine the design specifications of thecurrent amplifier.Design52An amplifier is used to record the short-circuit current of a transducer ofunknown internal resistance; the recorder requires 10V for a reading of 1cm. The recorder should read 10cm±2% for an input current of 1A. Theinput resistance of the recorder varies from RL=5kΩ to RL=20 kΩ. Determinethe design specifications of the transimpedance amplifier.Design53An amplifier is required to give a transconductance gain of Zm=20mA ⁄ V ±2%. The source resistance is Rs=1kΩ, and the load resistance is RL=200Ω.Determine the design specifications of the amplifier.Design54An amplifier is required to amplify the output signal from a transducer thatproduces a voltage signal of vs=10mv with an internal resistance ofRs=2.5kΩ. The load resistance RL=10kΩ. The desired output voltage isvo=5V. The amplifier must not draw more than1µA from the transducer. Thevariation in output voltage when the load is disconnected should less than1%. Formulate the design specifications of the amplifier and calculateDesign55An amplifier is required to amplify the output signal from a transducer thatproduces a constant current of is=200µA at an internal resistance varyingfrom Rs=20 kΩ to 100 kΩ. The desired output current is io=40 mA at a loadresistance varying from RL=20Ω to 500Ω. The variation in output currentshould be kept within ±3%. Determine the design specifications of theamplifier.Design56An amplifier is required to amplify the output signal from a communicationreceiver that produces a voltage signal of vs=40mV with an internalresistance of Rs=3kΩ. The load resistance is RL=20 kΩ. The desired outputvoltage is vo=20 V. The amplifier must not draw more than 2µA from thereceiver. The variation in output voltage when the load is disconnectedshould be less than 1%. Determine the design specifications of the voltageamplifier.Design57An amplifier is used to measure a DC voltage signal vs=0 to 10V with a Design5P a g e 5 | 13
source resistance of Rs=2kΩ to 5kΩ. The output of the amplifier is a meter that gives a full-scale deflection at a current of io=100 mA and whose resistance is Rm=20Ω to 100Ω. Determine the design specifications of the amplifier.
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