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An electronic circuit that is designed to amplify the difference between two voltages measured with respect to a common reference, usually designated...


= Encyclopedia Article; = Research Update
Differential amplifier using (a) metal-oxide-semiconductor field-effect transistors (MOSFETs), M1–M5, and (b) bipolar junction transistors (BJTs), Q1–Q5. VDD, VCC= positive power supplies; VSS, VEE= negative power supplies; v1, v2= input voltages; M1(Q1), M2(Q2) = input transistors with drain (collector) currents i1, i2; M3(Q3), M4(Q4) = load transistors forming current mirror with equal source (emitter) currents, i3 and i4; transistor M5(Q5) functions as current sink with value I5; IO= output current; vO= output voltage; RL= load resistance.
From Encyclopedia article 'Differential amplifier'
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