模拟CMOS集成电路设计课件1.Introduction.ppt

Layout Layout 第*页 Summary Analog IC Design combines a function or application with IC technology for a successful solution Analog IC design consists of three major steps Electrical design ? Topology, W/L values and DC currents Physical design (Layout) Test design (Testing) Analog designers must be flexible and have a skill set that allows one to simplify and understand a complex problem Analog IC design is driven by improving technologies rather than new technologies As a results of the above, analog finds applications where speed, area, or power have advantages over a digital approach 第*页 Homework Exercises Problem 1.1-2, 1.1-3, 1.1-4, 1.1-5, 1.1-7, 1.1-9, 1.1-12 Reading Reference 5 * * Passes for success: 2-3 for analog, 1 for digital 第*页 Introduction Silicon Technology 第*页 Introduction Typical Technology Bipolar vs. CMOS technology Category Bipolar CMOS Turn on voltage 0.5-0.6V 0.8-1V Saturation Voltage 0.2-0.3V 0.2-0.8V gm at 100uA 4mS 0.4mS(W=10L) Analog Switch Implementation Offsets, asymmetric Good Power Dissipation Moderate to high Low but can be large Speed Faster Fast Compatible Capacitors Voltage dependent Good AC performance Dependence DC variables only DC variables and geometry Number of terminals 3 4 Noise (1/f) Good Poor Noise Thermal OK OK Offset voltage 1mV 5-10mV 第*页 Analog Design Challenge Digital circuits deal primarily with speed power tradeoff Analog circuits deal with multidimensional tradeoff of speed, power, gain, precision, supply, etc. Due to speed and precision requirements, analog circuits are much more sensitive to noise, crosstalk and other interferers. High performance analog circuit design can rarely be automated Typically require hand-crafted design and layout Analog circuits are much more sensitive to second-order device effects Modeling and simulation of analog circuits is still problematic, requiring experience and intuition Economic forces require the development of analog circuits in mainstream digital processes and push the i