This book presents recent developments and advances regarding the design, applications and performances of analog circuits. The first part focuses on analog design automation and application of symbolic analysis, design issues for the future devices and circuits using silicon-germanium (SiGe), Heterojunction Bipolar Transistors (HBTs), and approximation in analog signal processing circuit design. The second part examines the application of transconductance amplifiers and realizations by applying the nodal admittance matrix technique, the automatic synthesis of current-feedback operational amplifiers and their applications to chaos-based secure communications, and application of amplifiers for the realisation of an analogue CMOS morphological edge detector for gray-scale images.