In this chapter, various techniques available for the design of integrated filters will be briefly introduced. These can be continuous-time or discrete-time types. Continuous-time filters are based on opamps together with resistors and capacitors. The filters using OTAs and capacitors are also considered. An alternative class of continuous-time filters operates in log-domain. In some designs, resistors in active RC filters using opamps are replaced by MOS transistors. SC filters, on the other hand, are sample-data filters and replace resistors with switches and capacitors. In order to meet high-frequency and low-voltage requirements, filters can be realized with current input and current output. These also use resistors and capacitors but use current mode devices such as current conveyor. These are also briefly introduced in this chapter to establish a setting for progressing further in the book.
KeywordsParasitic Capacitance Power Supply Voltage Current Conveyor Analog Filter Switch Capacitor
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