Differential Amplifiers Prof. Paul Hasler. Differential Transistor Pairs MOSFET Diff-PairBJT Diff-Pair.

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Presentation transcript:

Differential Amplifiers Prof. Paul Hasler

Differential Transistor Pairs MOSFET Diff-PairBJT Diff-Pair

Differential Transistor Pairs MOSFET Diff-PairBJT Diff-Pair The bottom transistor (the one with I bias ) sets the total current

Differential Transistor Pairs MOSFET Diff-PairBJT Diff-Pair The bottom transistor (the one with I bias ) sets the total current The upper two transistors compete for a fraction of this current

Analysis of Diff-Pair

Source of Common-Mode Gain

Analysis of Diff-Pair

Differential Pair Currents Differential input voltage (V) Output current (nA) I out + I out -

Transistor ‘Leg’ Currents

BJT Differential Pair Analysis V1V1 V2V2 VbVb GND I out +-

BJT Differential Amplifier V1V1 V2V2 VbVb GND I out +-

BJT Differential Amplifier V1V1 V2V2 VbVb GND V dd V out I out

BJT Differential Amplifier V1V1 V2V2 VbVb GND Fixed output voltage: Current output Zero output current: Voltage output V dd V out I out

Basic Differential Amplifier

Transfer Functions

Wide-Output Range Differential Amplifier Simple differential amplifer "Vmin" effect

Wide-Output Range Differential Amplifier Wide-output range amplifier Simple differential amplifer "Vmin" effect

Wide-Output Range Differential Amplifier Wide-output range amplifier Simple differential amplifer "Vmin" effect

A Unity-Gain Follower

A more ideal Follower / Buffer Circuit Amp Gain = A v Solving: V out = V in AvAv 1 + A v

A Unity-Gain Follower Amp Gain = A v Solving: V out ~ V in

A Unity-Gain Follower Amp Gain = A v Solving: V out ~ V in

Differential Pairs / Amplifiers Differential Transistor Pairs Differential Amplifiers Unity-Gain Amplifiers

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