Ch16 - Chapter 16 CMOS Amplifiers 16.1 General Considerations 16.2 Operating Point Analysis and Design 16.3 CMOS Amplifier Topologies 16.4

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Unformatted text preview: Chapter 16 CMOS Amplifiers 16.1 General Considerations 16.2 Operating Point Analysis and Design 16.3 CMOS Amplifier Topologies 16.4 Common-Source Topology 16.5 Summary and Additional Examples 16.6 Chapter Summary 1 Chapter Outline 2 CH 16 CMOS Amplifiers Example: Desired I/O Impedances 3 CH 16 CMOS Amplifiers ∞ → in R → amp R Method to Measure the I/O Impedances 4 CH 16 CMOS Amplifiers To measure R in (R out ), deactivate all the other independent sources in the circuit and find the ratio of v X /i X . X X in i v R = X X out i v R = Example: Input Impedance of a Simple Amplifier 5 CH 16 CMOS Amplifiers ∞ = ⇒ = in X R i The Concept of Impedance at a Node 6 CH 16 CMOS Amplifiers When the other node of a port is grounded, it is more convenient to use the concept of impedance at a node. Example: Impedance Seen at Drain 7 CH 16 CMOS Amplifiers O out r R = Example: Impedance Seen at Source 8 CH 16 CMOS Amplifiers m out g R 1 = Impedance Summary 9 CH 16 CMOS Amplifiers Looking into the gate, we see infinity. Looking into the drain, we see r O if the source is (ac) grounded. Looking into the source, we see 1/g m if the gate is (ac) grounded and r O is neglected. Bias and Signal Levels for a MOS Transistor 10 CH 16 CMOS Amplifiers Bias point analysis establishes the region of operation and the small-signal parameters. On top of the bias point, small signals are applied to the circuit. General Steps in Circuit Analysis 11 CH 16 CMOS Amplifiers First, the effects of constant voltage/current sources are analyzed when signal sources are deactivated. Second, small-signal analysis is done when constant sources are set to zero. Simplification of Supply Voltage Notation 12 CH 16 CMOS Amplifiers Example: Amplifier Driven by a Microphone 13 CH 16 CMOS Amplifiers 20mV 0V Microphone Output Since the DC (average) value is at zero, and 20mV is not sufficient to turn on M 1 , M 1 is off and V out is at V DD . Example: Amplifier with Gate Tied to V DD 14 CH 16 CMOS Amplifiers Since the gate voltage level is fixed at V DD , no signal current will be produced my M 1 , leading to no amplification. Example: Amplifier with Gate Bias 15 CH 16 CMOS Amplifiers With proper value of V B , M 1 can operate in the desired saturation region and amplify the incoming voice signal. Simple Biasing 16 CH 16 CMOS Amplifiers In (a), V GS =V DD , whereas in (b) V GS equals to a fraction of V DD . DD GS V R R R V 2 1 2 + = Example: Bias Current and Maximum R D 17 CH 16 CMOS Amplifiers Ω = Ω = = = = = K R K R L W V A C V V ox n TH 15 20 18 . 5 / 100 5 . 2 1 2 λ μ μ Ω = ⇒ = ⇒ =- = = - + = K R V V V V V A V V R R R L W C I D RD TH GS D TH DD ox n D 15 529 . 1 271 ....
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This note was uploaded on 06/18/2010 for the course CE 01 taught by Professor Bazgei during the Spring '09 term at University of California, Santa Cruz.

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Ch16 - Chapter 16 CMOS Amplifiers 16.1 General Considerations 16.2 Operating Point Analysis and Design 16.3 CMOS Amplifier Topologies 16.4

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