Transconductor and filter circuit

摘要

A transductor which has a transductance gm and which receives an input voltage Vin and outputs in response to the input voltage Vin an output current Iout of gmxVin, wherein: the transductor includes a plurality of sub-transconductors which are connected in parallel to one another; and at least one control signal is input to the plurality of sub-transconductors, and the plurality of sub-transconductors are controlled by the at least one control signal such that at least one of the plurality of sub-transconductors has a negative transconductance, whereby the transconductance gm of the transconductor can be varied.