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The Voltage Amplifier

Added on - 30 Sep 2019

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AssignmentVoltage Amplifier/Series-shunt FeedbackVoltage amplifiers are intended to amplify an input voltage signal and provide an outputvoltage signal. The voltage amplifier is essentially a voltage-controlled voltage source. Theinput impedance is required to be high, and the output impedance is required to be low.Because of the series connection at the input and the parallel or shunt connection at theoutput, this feedback topology is also known as series- shunt feedback.Current Amplifier/Shunt-Series FeedbackThe output quantity of interest is current; hence the feedback network should sample theoutput current. The feedback signal should be in current form so that it may be mixed inshunt with the source current. Thus the feedback topology suitable for a current amplifier isthe current-mixing current-sampling topology. Because of the parallel (or shunt) connectionat the input, and the series connection at the output, this feedback topology is also known asshunt-series feedback. This topology not only stabilizes the current gain but also results in alower input resistance, and a higher output resistance, both desirable properties for a currentamplifier.Transconductance Amplifier/Series-Series Feedback
In transconductance amplifiers the input signal is a voltage and the output signal is a current.It follows that the appropriate feedback topology is the voltage-mixing current-samplingtopology. The presence of the series connection at both the input and the output gives thisfeedback topology the alternative name series-series feedback.Transresistance Amplifier/Shunt-Shunt FeedbackIn transresistance amplifiers the input signal is current and the output signal is voltage. Itfollows that the appropriate feedback topology is of the current-mixing voltage-samplingtype. The presence of the parallel (or shunt) connection at both the input and the outputmakes this feedback topology also known as shunt-shunt feedback.
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