The current feedback operational amplifier (CFOA or CFA) is a type of electronic amplifier whose inverting input is sensitive to current, rather than to voltage as in a conventional voltage-feedback operational amplifier (VFA). Disadvantages Reduction in gain. The current feedback operational amplifier (CFOA or CFA) is a type of electronic amplifier whose inverting input is sensitive to current, rather than to voltage as in a conventional voltage-feedback operational amplifier (VFA). Shunt-Shunt Feedback Systems A useful approximation to the precise result is that the input or output impedance is equal to the source or load impedance for … in this f/b amplifier, the o/p current is proportional to the developed voltage. LECTURE 280 – SERIES-SHUNT AND SHUNT-SERIES FEEDBACK (READING: GHLM – 579-587) Objective The objective of this presentation is: 1.) Also called as series-series feedback. The simplest means to establish a transconductor in practice is to connect a series resistor at the output of a coventional voltage amplifier. The basic amplifier, figure 9.1, has two ports and is characterized by its gain, input impedance and output impedance. In negative feedback, the amplifier introduces a phase shift of 180 o into the circuit while the feedback network is so designed that it produces no phase shift or zero phase shift. The feedback in which the feedback energy i.e., either voltage or current is out of phase with the input and thus opposes it, is called as negative feedback. The CFA was invented by David Nelson at Comlinear Corporation, and first sold in 1982 as a hybrid amplifier, the CLC103. c.) Current Series Feedback Amplifier. In this type of circuit, a portion of the o/p voltage is applied to the i/p voltage in series through the feedback circuit. Current amplifier circuit. Input Impedance, Z IN or Input Resistance as it is often called, is an important parameter in the design of a transistor amplifier and as such allows amplifiers to be characterized according to their effective input and output impedances as well as their power and current ratings. Multiple Choice Questions and Answers on Amplifiers with Negative Feedback. In single stage amplifiers, input and output impedance depeds mainly on the amplifier configuration used. The CFA was invented by David Nelson at Comlinear Corporation, and first sold in 1982 as a hybrid amplifier, the CLC103. Two transistors are used in this circuit. then for a series-series feedback circuit the transfer gain is given as: Gm = Iout ÷ Vin. Table 3.2.1 compares basic input and output impedances for single stage voltage amplifiers (common emitter) and current… For a quick fictional example, if we get Zout=1.001 with the input resistor present and we get Zout=1.002 with it absent, it makes sense to leave it out, as long as we can prove this for any set of values that are within reason using typical values with typical ranges for their values (the output impedance Zo is almost always much smaller than the feedback resistors for example). The gain without feedback is: $$A=\frac{I_o}{V_i}=\frac{-h_{fe}}{h_{ie}+R_E}$$ and the feedback factor is: $$\beta=-R_E$$ The output impedance should then be: $$Z_{of}=Z_o(1+A\beta)=Z_o(1+\frac{R_Eh_{fe}}{h_{ie}+R_E})$$ This is a different result compared to finding the Thevinin equivalent resistance looking back into the output which just gives the output … Reduction in input resistance in case of voltage shunt and current shunt type amplifiers. Series-Series Feedback Amplifier (Current-Voltage FB) • For a transconductance amplifier (voltage input, current output), we must apply the appropriate feedback circuit – Sense the output current and feedback a voltage signal. Also called as shunt-series feedback. In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Question Bank in Electronics & Communication Engineering by Prem R Chadha Current shunt feedback amplifier is the type of negative feedback amplifier in which the part of the output current is applied in parallel with the input current. Current shunt feedback amplifier is the type of negative feedback amplifier in which the part of the output current is applied in parallel with the input current. 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