EE 435 Lect 13 Spring 2010

EE 435 Lect 13 Spring 2010 - EE 435 Lecture 13 Two-Stage Op...

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EE 435 Lecture 13 Two-Stage Op Amp Design
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Review Cascades of three or more amplifier stages are seldom used to build a feedback amplifier because of challenges associated with compensating the amplifier for stability when feedback is applied Two-stage amplifiers are widely used but compensation is critical for use in feedback applications Internal and output compensation are the two compensation strategies used for two-stage amplifiers The pole separation of the two major poles of an open loop amplifier must be large and generally satisfies the relationship There are many different ways to realize a 2-stage op amp – over 18,000 were identified in the last lecture 0TOT 0TOT A 2 β k A 4 β > >
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Two-stage Architectural Choices Cascode-Cascade Two-Stage Op Amp Review from Last Time
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Example Solution C C V OUT V IN V IN V DD V X3 V X4 V X5 Review from Last Time
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K2-W Op Amp by Philbrickk, 1952-1971 First Commercial Operational Amplifier
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“Widlar began his career at Fairchild semiconductor, where he designed a couple of pioneering op amps. By 1966, the commercial success of his designs became apparent, and Widlar asked for a raise. He was turned down, and jumped ship to the fledgling National Semiconductor. At National he continued to turn out amazing designs, and was able to retire just before his 30th birthday in 1970.” Inventor of the Two-Stage Op Amp Robert Widlar Many say he started the field of analog IC design, considered a brilliant engineer (from posted www site)
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Inventor of the internally-compensated Op Amp Dave Fullagar • Designed the first internally-compensate op amp, the 741 • Fullagar was 26 years old when this was designed (introduced?) • Introduced in 1968 • Largest selling integrated circuit ever • Still in high-volume production even though over 40 years old • Fullagar later started the linear design activities at Intersil • Cofounder (catalyst) of Maxim (from posted www site)
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Analysis of Internally Compensated Two- Stage Op Amps Can’t get everything but can get most of the small-signal results Consider single-ended input-output (differential analysis only slightly different) Since internally compensated, must have p 1 <<p 2
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Analysis of Internally
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EE 435 Lect 13 Spring 2010 - EE 435 Lecture 13 Two-Stage Op...

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