
27
Switched-Capacitor Building Blocks
3.1 Introduction
In this chapter we study basic switched-capacitor building blocks, which are the
requisites for realizing analog sampled-data functions.
Switched-capacitor (SC) building blocks are often classifi ed into two categories:
passive and active. A passive SC building block (or element) is defi ned as a network
composed of switches and capacitors only, whereas its active counterpart is not only
built from switches and capacitors, but also active devices such as op-amps. Strictly
speaking, a MOS switch is an active device, for it is composed of one or more
transistors, which must be driven by the system ...