单极放大器概述

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Applications and General Considerations

Applications of Amplifier:

to drive a load
to overcome the noise of a subsequent stage
to provide logical levels to a digital circuit
to play a role in feedback systems (Chapter 8)

Amplifier categories

Common-Source Stage (共源)	Source Follower (源极跟随器)	Common-Gate Stage (共栅)	Cascode (共源共珊)
With Resistive Load	With Resistive Bias	With Resistive Load	Telescopic
With Diode-Connected Load	With Current-Source Bias	With Current-Source Load	Folded
With Current-Source Load
With Active Load
With Source Degeneration

For each amplifier above, we will

analyze the MOS’s stage using the equation we learn at chapter 1
introduce the small-signal model
discuss how to increase the gain

An ideal amplifier: output is a linear replica of the input: $y (t) = α_{1} x (t)$ , where $α_{1}$ denote the gain. if we consider the bias (dc operating) point, the overall output is $y (t) = α_{0} + α_{1} x (t)$

Any amplifier is a compomise (trade-off) between “analog design octagon”:

Figure 3.3 Analog design octagon

In this chapter, we are going to discuss how to calculate $A_{v}$ and $r_{o}$

Source Follower 单极放大器作业

单极放大器概述

Applications and General Considerations

In this chapter, we are going to discuss how to calculate Av and ro

In this chapter, we are going to discuss how to calculate $A_{v}$ and $r_{o}$