EE 332 Lesson 0809 - 8/9/2010 OPERATIONAL AMPLIFIER DESIGN...

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8/9/2010 1 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock EE 332 DEVICES AND CIRCUITS II WEEK 8 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock OPERATIONAL AMPLIFIER DESIGN / STAGE THREE (CLASS B AMPLIFIER) Class B Amplifier : a device conducts for only 180 out of 360 possible during full cycle improved efficiency How is works: When v in is positive M1 turns on; M2 turns off I DS1 charges v out When v in is negative M1 turns off; M2 turns on I DS2 discharges v out M1 on when M2 off and vice versa; push-pull action v in R L v o -V SS V DD M1 M2 11 ©UW EE TC Chen Microelectronic Circuit Design Jaeger/Blalock OPERATIONAL AMPLIFIER DESIGN / STAGE THREE (CLASS B AMPLIFIER) sin in DD v V t Consider: Crossover distortion Most distortion increases as signal size increases Large signal: harmonic distortion Small signal: crossover distortion We have created a distortion problem, but how well did we improve the efficiency problem V t t v out v in v in 12
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