微电子专业外语9

Design of Analog COMS Integrated Circuit
• Single-Stage Amplifiers
❖Amplification is an essential function in most analog (and many digital) circuits. We amplify an analog or digital signal because it may be too small to drive a load.
Design of Analog COMS Integrated Circuit
• Basic MOS Device Physics
❖Moreover, for given dimensions and bias currents, NMOS transistors exhibit a high源自文库r output resistance, providing more ideal current sources and higher gain in amplifiers.
❖注意： reasonable
Design of Analog COMS Integrated Circuit
• Basic MOS Device Physics
❖NMOS versus PMOS Devices ❖In most CMOS technologies, PMOS devices
are quite inferior to NMOS transistors. For example, due to the lower mobility of holes, UpCox ~ 0.25UnCox in modern processes, yielding low current drive and transconductance.
❖The intuition thus gained makes it possible to formulate the behavior of most circuits by inspection rather than by lengthy calculations.
❖注意： inspection, lengthy
Design of Analog COMS Integrated Circuit • Basic MOS Device Physics
❖For these reasons, it is preferred to incorporate NFETs rather than PFETs wherever possible.
❖注意： intuitive, complex systems
Design of Analog COMS Integrated Circuit
• intuitive, complex systems
❖ intuitive ❖[ɪnˈtu:ɪtɪv, -ˈtju:-] ❖ adj.直觉的；凭直觉获知的；直观的
❖complex systems复杂系统
Design of Analog COMS Integrated Circuit
• Single-Stage Amplifiers
❖An important part of a designer's job is to use proper approximations so as to create a simple mental picture of a complicated circuit.
Design of Analog COMS Integrated Circuit
❖注意： mental picture
Design of Analog COMS Integrated Circuit
• mental picture
❖mental picture 记忆图像 Mental [英] [ˈmentl] ❖ adj.内心的，精神的，思想的，心理的；智慧的
Design of Analog COMS Integrated Circuit • Single-Stage Amplifiers
❖注意： incorporate包含;加上;吸收
Design of Analog COMS Integrated Circuit
• Basic MOS Device Physics
❖Long-Channel versus Short-Channel Devices
❖In this chapter, we have employed a very simple view of MOSFETs so as to understand the basic principles of their operation.
Design of Analog COMS Integrated Circuit
• Basic MOS Device Physics
❖The first step is to determine the simplest device model that can represent the role of each transistor with reasonable accuracy.
Design of Analog COMS Integrated Circuit
• Single-Stage Amplifiers
❖In this chapter, we study the low-frequency behavior of single-stage CMOS amplifiers. Analyzing both the large-signal and the smallsignal characteristics of each circuit, we develop intuitive techniques and models that prove useful in understanding more complex systems.