Answer Happy

Slew Rate Limitations 1. For the unity-gain buffer in Fig. 6, find the transfer function V₁/V;(s), and sketch the magnitude Bode plot. 2. If the slew rate of the opamp is 0.5V/µs, find the maximum frequency of the 1V sine wave input signal before the output is distorted. 3. If the slew rate of the opamp is 0.5V/μs, find the maximum amplitude of the 75kHz sine wave input signal before the output is distorted.
Slew Rate An ideal opamp is capable of following the input signal no matter how fast the input changes. In a real 741, the output rise/fall transient cannot exceed a maximum slope; the maximum rate of change of the output voltage as a function of time is defined as the slew rate. Applying signals with transients that exceed this limit results in distorted output signals. To avoid distortion due to slew rate limitations, maximum rate of change of output must be kept less than the slew rate specifications of the opamp. The slew rate can be measured by applying a large square waveform at the input. The slope of the rise time at the output is the slew rate. + 9 +5V V+ V. N1 N2 5 -5V 6 V₂ Figure 6: Unity-gain buffer configuration