35. Frequency Response of CE and CS Amplifiers (Part A)
The chapter delves into the frequency response of Common Emitter (CE) and Common Source (CS) amplifiers, specifically focusing on how the gain varies with frequency. It revisits the frequency response of RC and CR circuits to establish foundational concepts and connects them to the transfer functions crucial for analyzing amplifier behaviors. The significance of cut-off frequencies, pole-zero relationships, and Bode plots is also emphasized to help grasp amplifier design and analysis.
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What we have learnt
- Understanding the frequency response indicates how circuit behavior changes with input signal frequency.
- The transfer function in the Laplace domain can be transformed to the frequency response by substituting s with jω.
- Key relationships exist between the pole of the transfer function and the cut-off frequencies of the frequency response.
Key Concepts
- -- Frequency Response
- Indicates how the output of a circuit responds to different input frequencies.
- -- Transfer Function
- Mathematical representation of the output-to-input ratio of a system in the Laplace domain.
- -- Cutoff Frequency
- The frequency at which the output amplitude starts to decrease significantly, marking the transition between pass and stop bands.
- -- Bode Plot
- A graphical representation of the frequency response, plotted in decibels versus frequency, typically on a logarithmic scale.
- -- PoleZero Relationship
- Describes how the poles and zeros of a transfer function affect the frequency response of the circuit.
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