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Operational Amplifiers (Op Amps)

Operational Amplifiers (Op Amps). Discussion D3.1. Operational Amplifiers (Op Amps). Ideal Op Amp Non-inverting Amplifier Unity-Gain Buffer Inverting Amplifier Differential Amplifier Current-to-Voltage Converter Non-ideal Op Amp. Ideal Op Amp. 1).

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Operational Amplifiers (Op Amps)

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  1. Operational Amplifiers (Op Amps) Discussion D3.1

  2. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  3. Ideal Op Amp 1) The open-loop gain, Av, is very large, approaching infinity. 2) The current into the inputs are zero.

  4. Ideal Op Amp with Negative Feedback Golden Rules of Op Amps: • The output attempts to do whatever is necessary to make the voltage difference between the inputs zero. • The inputs draw no current.

  5. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  6. Non-inverting Amplifier Closed-loop voltage gain

  7. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  8. Unity-Gain Buffer Closed-loop voltage gain Used as a "line driver" that transforms a high input impedance (resistance) to a low output impedance. Can provide substantial current gain.

  9. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  10. Inverting Amplifier Current into op amp is zero

  11. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  12. Differential Amplifier Current into op amp is zero

  13. Differential Amplifier

  14. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  15. Current-to-Voltage Converter

  16. Photodiode Circuit At 50 mW

  17. Operational Amplifiers (Op Amps) • Ideal Op Amp • Non-inverting Amplifier • Unity-Gain Buffer • Inverting Amplifier • Differential Amplifier • Current-to-Voltage Converter • Non-ideal Op Amp

  18. Non-ideal Op Amp • Output voltage is limited by supply voltage(s) • Finite gain (~105) • Limited frequency response • Finite input resistance (not infinite) • Finite output resistance (not zero) • Finite slew rate • Input bias currents • Input bias current offset • Input offset voltage • Finite common mode rejection ratio (CMRR)

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