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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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