74. Single - ended Vs. Differential Signaling and Basic Model of a Differential Amplifier(Contd.)
Differential amplifiers are essential for enhancing signal quality by suppressing common mode noise while amplifying differential signals. The chapter discusses the purpose and need for differential signaling, highlighting situations where common ground differences can corrupt signals. It explores various differential amplifier configurations, emphasizing the importance of differential mode gain and common mode gain in achieving effective signal processing.
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What we have learnt
- Differential amplifiers amplify the difference between two input signals while rejecting any common noise.
- Common mode signals can lead to signal distortion, highlighting the need for differential signaling in long-distance transmissions.
- Operational amplifiers (op-amps) are practical applications of differential amplifiers, often utilizing differential inputs to produce amplified outputs.
Key Concepts
- -- Differential Amplifier
- An electronic circuit that amplifies the difference between two voltages and suppresses any signals that are common to both inputs.
- -- Common Mode Gain
- The gain of the amplifier for signals that are present simultaneously and in phase on both inputs; ideally it should be zero for effective differential amplification.
- -- Differential Mode Gain
- The gain of the amplifier for signals that differ between the two inputs; a higher gain indicates better amplification of the desired signal.
- -- Differential Signaling
- A technique for transmitting signals in the form of a pair of complementary signals to reduce noise and improve transmission reliability.
- -- Fully Differential Amplifier
- An amplifier with differential inputs and outputs, allowing it to handle signals fully in a differential manner to maintain signal integrity.
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