Abstract
Basic functional primitives, such as summation, delay, sign inversion and scaling, are of fundamental importance in analog sampled-data signal processing systems. Data-conversion systems also include comparison and D/A conversion functions. This chapter describes the building blocks most commonly used to realize switched-current (SI) filters and data-conversion circuits. First their ideal behavior is explained in section 2.1. Then a number of non-ideal effects are discussed in section 2.2. The most significant problem in SI circuits is charge injection from MOS switches, also known as clock-feedthrough (CFT). A number of CFT compensation techniques are illustrated in section 2.3. Most of the performance of an SI circuit is set by the limitations of the current sample - and - hold (CSI - 1). Section 2.4 closes the chapter with an overview of the evolution of the CSH or SI memory cell (SI MC).
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