EE 435 Lect 10 Spring 2010

EE 435 Lect 10 Spring 2010 - EE 435 Lecture 10 Current...

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EE 435 Lecture 10 Current Mirror Op Amps (wrap up) Other Gain Enhancement Strategies - Cascaded Amplifiers
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OTA Applications in m m OUT V g g V 2 1 = Voltage Controlled Resistorless Amplifiers in m m OUT V g g V 2 1 = Noninverting Voltage Controlled Amplifier Inverting Voltage Controlled Amplifier Extremely large gain adjustment is possible Review from Last Time
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OTA Applications in m OUT V sC g V = in m OUT V sC g V = Voltage Controlled Integrators Noninverting Voltage Controlled Integrator Inverting Voltage Controlled Integrator Review from Last Time
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L T C MI SR = L T Amp Op CM C I M SR 2 = Fully Differential Current Mirror Op Amp with Improved Slew Rate Improved a factor of 2 ! but … ( ) M 1 I V P T DD Amp Op CM + = ( ) M 1 I V P T DD 2 + = [] + = M M C V P SR L DD Amp Op CM 1 2 + = M M C V P SR L DD 2 1 SR actually about the same for “improved SR circuit” and basic OTA Review from Last Time
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Comparison of Current-Mirror Op Amps with Previous Structures L EB T L m L mEQ C V MI C g M C g GB 1 1 2 2 = = = ( ) M 1 I V P T DD + = How does the GB power efficiency compare with previous amplifiers ? GB efficiency decreased for small M !! + = = M 1 M C V 2V P C 2V MI GB L DD EB1 L EB1 T GB for Telescopic Cascode and Ref Op Amp ! Review from Last Time
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Current-Mirror Op Amps – Another Perspective ! Differential Half-Circuit
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Current-Mirror Op Amps – Another Perspective ! Differential Half-Circuit Cascade of n-channel common source amplifier with p-channel common-source amplifier !
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Current-Mirror Op Amps – Another Perspective ! + = 8 6 6 4 2 2 1 O O m m m V g g g g g A 8 6 1 4 6 8 6 1 2 2 O O m m m O O m VO g g g g g g g g M A + = + = Differential Half-Circuit Cascade of n-channel common source amplifier with p-channel common-source amplifier ! From Current Mirror Analysis :
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Stability Sometimes circuits that have been designed to operate as amplifiers do not amplify a signal but rather oscillate when no input signal is present (V in =0V or I in =0A) or “latch up”
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EE 435 Lect 10 Spring 2010 - EE 435 Lecture 10 Current...

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