Lab_2_2C_2007

Lab_2_2C_2007 - ECE 2C Laboratory Manual 2 MOS Amplifier...

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1 © Bob York ECE 2C Laboratory Manual 2 MOS Amplifier Basics Overview This lab will explore the design and operation of basic single-transistor MOS amplifiers at mid-band. We will explore the common-source and common-gate configurations, as well as a CS amplifier with an active load and biasing. Table of Contents Pre-lab Preparation 2 Before Coming to the Lab 2 Parts List 2 Background Information 3 Small-Signal Amplifier Design and Biasing 3 MOSFET Design Parameters and Subthreshold Currents 5 Estimating Key Device Parameters 7 In-Lab Procedure 8 2.1 Common-Source Amplifier 8 Common-Source, no Source Resistor 8 Linearity and Waveform Distortion 8 Effect of Source and Load Impedances 9 Common-Source with Source Resistor 9 2.2 Common-Gate Amplifier 10 2.3 Amplifiers with Active Loading 11 Feedback-Bias Amplifier 11 CMOS Active-Load CS Amplifier 12
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2 MOS Amplifier Basics © Bob York Pre-lab Preparation Before Coming to the Lab Read through the lab experiment to familiarize yourself with the components and assembly sequence. Before coming to the lab, each group should obtain a parts kit from the ECE Shop. Parts List The ECE2 lab is stocked with resistors so do not be alarmed if you kits does not include the resistors listed below. Some of these parts may also have been provided in an earlier kit. Laboratory #2 MOS Amplifiers Qty Description 2 CD4007 CMOS pair/inverter 4 2N7000 NMOS 4 1uF capacitor (electrolytic, 25V, radial) 8 10uF capacitor (electrolytic, 25V, radial) 4 100uF capacitor (electrolytic, 25V, radial) 4 100-Ohm 1/4 Watt resistor 4 220-Ohm 1/4 Watt resistor 1 470-Ohm 1/4 Watt resistor 4 10-KOhm 1/4 Watt resistor 1 33-KOhm 1/4 Watt resistor 2 47-KOhm 1/4 Watt resistor 1 68-KOhm 1/4 Watt resistor 4 100-KOhm 1/4 Watt resistor 1 1-MOhm 1/4 Watt resistor 1 10k trimpot 2 100k trimpot
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Background Information 3 © Bob York 3 Background Information Small-Signal Amplifier Design and Biasing In earlier experiments with transistors we learned how to establish a desired DC operating condition. If a small time-varying signal is superimposed on the DC bias at the input (gate or base terminal), then under the right circumstances the transistor circuit can act as a linear amplifier. Figure 2-1 illustrates the situation appropriate to a MOSFET common-source amplifier. The transistor is first biased at a certain DC gate bias to establish a desired drain current, shown as the “Q”-point (quiescent point) Figure 2-1a. A small AC signal of amplitude gs V is then superimposed on the gate bias, causing the drain current to fluctuate synchronously. If gs V is small enough, then we can approximate the d I vs. gs V curve by a straight line with a slope given by d m gs I g V (2.1) and then the drain current amplitude is dm g s Ig V  . With a drain resistor d R as shown, the drain current is related to the output voltage by ds dd d d VV I R , so the AC output signal will be given by ds d d m d gs VI R g R V   (2.2) The voltage gain is therefore vm d Ag R   . This can be appreciated graphically using a load-
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This note was uploaded on 12/28/2011 for the course ECE 2C taught by Professor Yue during the Fall '08 term at UCSB.

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Lab_2_2C_2007 - ECE 2C Laboratory Manual 2 MOS Amplifier...

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