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Transcript
Analog Quick Notes Ravi Dixit www.learnanalog.com MOS Operation Modes • Cutoff if Vgs< Vt then Ids = 0 • Linear if Vgs> Vt & Vds < Vgs – Vt then • Saturation If Vgs> Vt & Vds > Vgs – Vt then 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) Single Stage Amplifier • Common Source • Common Drain ( Source Follower) • Common Gate 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 ) 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 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 Please visit this page again soon for more information
