Lect2UP180_(100327)

Lect2UP180_(100327) - Lecture 180 Inverting Amplifiers...

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Lecture 180 – Inverting Amplifiers (3/27/10) Page 180-1 CMOS Analog Circuit Design © P.E. Allen - 2010 LECTURE 180 – INVERTING AMPLIFIERS LECTURE ORGANIZATION Outline • Introduction • Active Load Inverting Amplifier • Current Source Load Inverting Amplifier • Push-Pull Inverting Amplifier • Noise Analysis of Inverting Amplifiers • Summary CMOS Analog Circuit Design, 2 nd Edition Reference Pages 168-180 Lecture 180 – Inverting Amplifiers (3/27/10) Page 180-2 CMOS Analog Circuit Design © P.E. Allen - 2010 INTRODUCTION Types of Amplifiers Type of Amplifier Gain = Output Input Ideal Input Resistance Ideal Output Resistance Voltage A v = Output Voltage Input Voltage Infinite Zero Current A i = Output Current Input Current Zero Transconductance G m = Output Current Input Voltage Transresistance R m = Output Voltage Input Current Zero Zero Most CMOS amplifiers fit naturally into the transconductance amplifier category as they have large input resistance and fairly large output resistance. If the load resistance is high, the CMOS transconductance amplifier is essentially a voltage amplifier.
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Lecture 180 – Inverting Amplifiers (3/27/10) Page 180-3 CMOS Analog Circuit Design © P.E. Allen - 2010 Amplifier Notation 060607-02 Voltage Amplifier Input Voltage Output Voltage V DD V SS Split Power Supplies Voltage Amplifier Input Voltage Output Voltage V DD Single Power Supply Simpler notation: 060607-03 Voltage Amplifier Input Voltage Output Voltage V DD V SS Split Power Supplies Voltage Amplifier Input Voltage Output Voltage V DD Single Power Supply Lecture 180 – Inverting Amplifiers (3/27/10) Page 180-4 CMOS Analog Circuit Design © P.E. Allen - 2010 Characterization of an Amplifier 1.) Large signal static characterization: • Plot of output versus input (transfer curve) • Large signal gain • Output and input swing limits 2.) Small signal static characterization: • AC gain • AC input resistance • AC output resistance 3.) Small signal dynamic characterization: • Bandwidth • Noise • Power supply rejection 4.) Large signal dynamic characterization: • Slew rate • Nonlinearity
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Lecture 180 – Inverting Amplifiers (3/27/10) Page 180-5 CMOS Analog Circuit Design © P.E. Allen - 2010 Components of a CMOS Voltage/Transconductance Amplifier 1.) A transconductance stage that converts the input voltage to current. 2.) A transresistance stage (load) that converts the current from the transconductance stage back to voltage. 060607-01 Voltage Amplifier Input Voltage Output Voltage Voltage-to Current Conversion Input Voltage Current-to Voltage Conversion Current Output Voltage Transconductance Stage Transresistance Stage Voltage Amplifier Lecture 180 – Inverting Amplifiers (3/27/10) Page 180-6 CMOS Analog Circuit Design © P.E. Allen - 2010 Inverting and Noninverting Amplifiers The types of amplifiers are based on the various configurations of the actual transistors.
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Lect2UP180_(100327) - Lecture 180 Inverting Amplifiers...

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