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Worked Examples

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  1. Worked Examples • Practical Op-Amp Design • Schmitt Trigger • Precision Rectifier

  2. Transient analysis waveform (sine wave, 0V offset, 1.38V amplitude, 1kHz) a.c. analysis magnitude Independent voltage source Non-Inverting Amplifier

  3. Microcap Demo TC-OPAMP1.CIR

  4. Schmitt Trigger Design • Design an inverting Schmitt trigger with the following specification: • Supply voltages = +9V and 0V • Saturation levels = 0.5V and 8.5V • Switching thresholds = 6V and 7V

  5. (1) • (2) (2) – (1)

  6. Let

  7. Equivalent if: • Open-circuit voltages are the same • Short-circuit currents are the same

  8. Microcap Demo TC-OPAMP1A.CIR

  9. Precision Rectifier Microcap Demo TC-OPAMP2.CIR

  10. Summary: Examinable Op-Amp Stuff • Analysis • Amplifiers: gain, cut-off frequency, in/out impedances, full-power bandwidth etc. • Comparators: switching level(s), effects of slew rate etc., oscillator circuit, applications. • Precision Rectifier: waveforms, slew rate limiting etc. • Design • Amplifiers, comparators, oscillators.