The Output StageVccBIA>Qn and Qp provides thevoltage drop which equals to thesummer of turn-on voltages of7Qn and Qp.>This circuit is call Class ABoutput stage.UOEF(d)Microelectronic Circuits
Microelectronic Circuits The Output Stage ➢QN and QP provides the voltage drop which equals to the summer of turn-on voltages of QN and QP. ➢This circuit is call Class AB output stage
Vcc(+15V)Q13Q12euQi3BQisQ:QigOOutQis1WW1RIo=20Rs=40KI2Q2139knQ20Cc=30pF3Q4IREFQ230YQ16QiQ10JQ>R, =QsQ6> R =Rg=2>50kK>5kΩ>1000R=20R2>50k0=>>R,=>1knQ221knRu=>50kn?VE(-15V
Microelectronic Circuits
The Biasing CircuitsReference current is generated by Q12, Q1 andR5Wilder current provides biasing current in theorder of μA.Double-collector transistor is similar to the two-output current mirror. Q13B provides biasingcurrent for intermediate stage, Q13A for outputstage.Q5, Q6 and Qz is composed of the current sourceto be an active load for input stageMicroelectronic Circuits
Microelectronic Circuits The Biasing Circuits ⚫ Reference current is generated by Q12, Q11 and R5 . ⚫ Wilder current provides biasing current in the order of μA. ⚫ Double-collector transistor is similar to the twooutput current mirror. Q13B provides biasing current for intermediate stage, Q13A for output stage. ⚫ Q5 , Q6 and Q7 is composed of the current source to be an active load for input stage