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06_OPAMP1 - EE6326 Analog IC Design Fall 2008 Topic 6...

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1 1 WLCHEN EE6326 Analog IC Design – Fall 2008 Topic 6. Operational Amplifier (OPAMP) - 1 Wenliang Chen, Ph. D. Instructor
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2 2 WLCHEN Outline Review of OP AMP basics (EE4340) OPAMP Applications Basic Functions Inverting/non-inverting Amp. Unity gain buffer/summing/difference Amp. Integrator Frequency Response Pole, zero and phase OP AMPs Basic structure: 1-stage & 2-stage 3 Most Used OP AMP Structures in ICs Folded Cascode 2-Stage (7-transistor) Current Mode OTA vs Av Amplifier Folded Cascode OP AMPs Design of folded cascode OP AMPs Gain booster Slew rate PSRR
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3 3 WLCHEN Basic Amplifiers - + A R1 R2 Vin Vout Inverting Amplifier ground virtual V A! of t Independen 1. A if R R R R AR AR - V V x 2 1 2 1 2 1 in out >> + + = ~ Vx R1 Non-inverting Amplifier 1 A if R R 1 ~ ) AR R R (1 R ) R (R ~ AR R R ) R A(R V V R R R V V ; R R V I 2 1 2 2 1 2 2 1 2 2 1 2 1 in out 2 2 1 out x 2 1 out >> + + + + + + = × + = + = - + A R2 Vin Vout Vx - + A Vin Vout Unity gain buffer gain error term
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4 4 WLCHEN Basic Amplifiers R1 Difference Amplifier R R ) V (V V ) V (V R V R V R V R V R V R V R V R R R V R R ) V (V R V R R V V R V V I V R R R V ; R R V V I 2 1 1 2 out 1 2 1 out 2 2 1 1 2 1 1 1 2 out 2 2 2 1 1 1 2 1 1 out 2 x 2 1 1 out 2 1 x 2 2 1 1 x 2 1 1 out = = = + + × + = + + = + = = × + = + = - + A R2 V2 Vout V1 R1 R2 Vx - + A R1 R2 Vin1 Vout Voltage Summing Amplifier 2 1 in2 in1 out 3 2 3 in2 2 in1 1 1 1 out 3 2 1 3 in2 3 2 in1 2 x R R ) V (V V ; R R If R V R V ( R R -I V I I I - ; R V I ; R V I ground virtual is V + = = + = = + = = = ) Vx R3 Vin2
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5 5 WLCHEN Basic Current Summing Current Summing Current Difference V DD M2, 1X I1 M1, 1X I1 I2 M3, 1X I2 M4, 1X I1+I2 I V DD 1 1 K-1 K-1 I/K I(1-1/K)
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6 6 WLCHEN OPAMP Applications dt R C V V dt C dV R V t 0 2 1 in out 1 out 2 in = = - + A C1 R2 Vin Vout Integrator Low Zout (OTA + source follower) High Zin 0V Integrator O perational T ransconductance A mp . gm= δ (iout)/ δ (vin) - + gm C1 Vin Vout High Zout High Zin dt C gmV V gmV i t 0 1 in out in out = = Ideal V-source has low Zout Ideal I-source has high Zout
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7 7 WLCHEN Bode Plot: Poles and LHP Zero + = + + + = + + + = p1 1 1 - z0 1 1 - p0 1 1 - 1 2 p1 1 2 p0 1 2 z0 1 0 1 p1 p0 z0 0 f f tan f f tan f f tan ) A(f f f 1 f f 1 f f 1 A ) A(f ) jf/f )(1 jf/f (1 ) jf/f (1 A A(f) ] [ |A(f)| f f A(f) |A0| fp0 fz0 fp1 -90 o 0 o -45 o fu
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8 8 WLCHEN Bode Plot: Poles and RHP Zero = + + + = + + = p1 1 1 - z0 1 1 - p0 1 1 - 1 2 p1 1 2 p0 1 2 z0 1 0 1 p1 p0 z0 0 f f tan f f tan f f tan ) A(f f f 1 f f 1 f f 1 A ) A(f ) jf/f )(1 jf/f (1 ) jf/f (1 A A(f) ] [ |A(f)| f f A(f) |A0| fp0 fz0 fp1 -90 o 0 o -45 o fu -135 o -180 o -270 o -225 o
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9 9 WLCHEN Gain-bandwidth Product u 3dB - 0 3dB - u 0 3dB - u 2 3dB - u u 3dB - 2 3dB - u 0 u 3dB - 0 f f A 1; f f A f f ~ f f 1 ; f f If f f 1 A ) A(f ) jf/f (1 A A(f) = × =
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