78. Differential Amplifier : Analysis and Numerical Examples (Contd.)
The chapter covers the analysis of differential amplifiers, specifically focusing on their common mode and differential mode responses. It highlights the behavior of these amplifiers under various signal conditions, including small and large signal analyses. Emphasis is placed on understanding the role of DC operating points and the significance of common mode and differential gains in practical applications.
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What we have learnt
- Differential amplifiers respond differently to common mode and differential input signals.
- The DC operating point is crucial for the proper functioning of the amplifier, influencing both the output swing and signal integrity.
- Analysis of both small and large signal scenarios is essential for understanding amplifier performance and designing effective circuits.
Key Concepts
- -- Differential Mode Gain
- The gain of the differential amplifier when the input signals at the two terminals are out of phase.
- -- Common Mode Gain
- The gain of the differential amplifier when the input signals at both terminals are identical.
- -- DC Operating Point
- The point on the output characteristics of an amplifier that corresponds to a specific biasing condition and determines its active operating state.
- -- Common Mode Range
- The range of common mode input voltages for which the amplifier retains proper linear operation.
- -- Pseudo Differential Mode
- A mode of operation where one input terminal is grounded while a differential signal is applied to another, leading to a near differential response.
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