This text deals with the design and analysis of log-domain filter circuits. It describes several synthesis methods that aid the designer in developing bipolar or BiCMOS filter circuits with cut-off frequencies ranging from the low kilohertz range to several hundreds of megahertz. Filter response deviations due to transistor-level nonidealities are systematically analyzed, leading to effective electronic compensation schemes. Numerous examples are provided in the text with measured experimental data from IC prototypes. The book is intended for engineers in research or development, as well as advanced-level engineering students. Extensive discussion on filter text metrics should also interest engineers who are responsible for testing high-performance, high-speed analog or mixed-signal products.