Covers general circuit level design issues for analog integrated circuits. Techniques for achieving efficient analysis of transistor circuits are presented, including a new Thevenin model for transistors which simplifies analysis. Basic analog building blocks are also presented, including single and differential amplifiers, current mirrors, operational amplifiers, samplers, and switched-capacitor networks. Non-idealities such as thermal and 1/f noise, offset variation, and mismatch are discussed, along with techniques to minimize the negative influence of such issues. The basics of higher level building blocks such as analog-to-digital and digital-to-analog converters are also presented.