Using multiple-input transconductors to reduce number of components in OTA-C filter design

Depending on the structure of the OTA and the topology of an OTA-C filter, the use of multiple-input OTAs can reduce the number of components, silicon area, and power dissipation by approximately a factor k, where k is the number of inputs of the OTA. A suitable bipolar OTA is presented, together with an example of ladder synthesis.