On Determining Loop Gain through Circuit Simulation
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چکیده
Amplifiers employing positive or negative feedback are fundamental building blocks in electronic circuits. Negative feedback is employed to linearize amplifiers in order to reduce distortion of the input signal and improve amplifier bandwidth. Conversely, applying sufficient positive feedback to an amplifier results in an oscillator because an output signal occurs when no input signal is present. Figure 1 depicts a block diagram for a simple amplifier with positive feedback. The gain of the amplifier is A while the gain (or loss) of the feedback network is K. The input and output voltages of the overall circuit are vi and vo respectively, while the voltage at the output of the feedback network is vf. Again referring to Figure 1, the output voltage is obtained from the amplified sum of the input and feedback voltages, or
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