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Understanding MOS Amplifiers for Efficient Circuit Design

Learn about MOS amplifier operation modes such as Cutoff, Linear, and Saturation. Explore the characteristics of amplifiers needed for optimal performance, including high gain, low power consumption, and robustness to variations. Discover single-stage amplifier configurations like Common Source and Common Drain, and their key features.

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Understanding MOS Amplifiers for Efficient Circuit Design

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  1. Analog Quick Notes Ravi Dixitwww.learnanalog.com

  2. MOS Operation Modes • Cutoff if Vgs< Vt thenIds = 0 • Linear if Vgs> Vt & Vds < Vgs – Vt then • Saturation If Vgs> Vt &Vds > Vgs – Vt then

  3. Required Characteristics of Amplifier • High Gain for bandwidth of operation • Less power consumption • Required linear input output transfer characteristic for less distortion • Large output signal swing • Less silicon area • Noise generated by amplifier should be low • Robust to Process, Supply & Temperature variations • High input impedance (shouldn’t load previous stage) • Low output impedance (should efficiently drive next stage or load)

  4. Single Stage Amplifier • Common Source • Common Drain ( Source Follower) • Common Gate

  5. Common Source Amplifier • Voltage Amplifier • Input Impedance : High( Infinity) • Output Impedance : Moderate (~ Rload) • Voltage Gain : Moderate (~ - gm * Rload) • Current Gain : Infinity • Bandwidth : low ( Gate source high effective capacitance due to miller effect )

  6. Common Drain Amplifier • Voltage Buffer • Also known as Source Follower • Input Impedance : High ( Infinity) • Output Impedance : Moderate (~ Rload ||1/gm) • Voltage Gain : ~ Unity (Rload / (Rload + 1/gm ) • Current Gain : Infinity • Bandwidth : High

  7. Common Gate Amplifier • Used as a Current Buffer or Voltage Amplifier • Input Impedance : Low ( ~ 1/gm) • Output Impedance : Moderate (~ Rload ) • Voltage Gain : Moderate (~ gm * Rload) • Current Gain : Unity • Bandwidth : Moderate

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