3. Op-Amp Feedback Configurations
Operational amplifiers (Op-Amps) utilize feedback to manage circuit behavior, and primarily negative feedback is employed for gain stabilization, linearity, and bandwidth enhancement. The chapter explores three main configurations: inverting, non-inverting, and differential amplifiers, detailing their circuit designs, gain equations, and applications. Real-world design examples are provided for practical understanding of these configurations.
Sections
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What we have learnt
- Feedback in Op-Amps can be either negative or positive, with negative feedback being predominant in linear applications.
- Inverting amplifiers invert and amplify input signals based on the feedback resistor and input resistor ratio.
- Non-inverting amplifiers amplify input signals without inversion, maintaining an in-phase output.
- Differential amplifiers amplify the difference between two input signals, ideal for reducing common-mode noise.
Key Concepts
- -- Inverting Amplifier
- An Op-Amp configuration that inverts the input signal while providing amplification determined by the ratio of two resistors.
- -- NonInverting Amplifier
- An Op-Amp configuration that amplifies the input signal without inversion, producing an output that is in-phase with the input.
- -- Differential Amplifier
- An Op-Amp configuration that amplifies the difference between two input signals, commonly used in data acquisition and instrumentation.
- -- Feedback Resistor (R₂)
- The resistor that connects the output of an Op-Amp back to its inverting or non-inverting input, influencing the overall gain.
- -- Input Resistor (R₁)
- The resistor connected to the input of an Op-Amp that, along with the feedback resistor, determines the gain.
Additional Learning Materials
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