Patent ID: 6933773

Claim:
An integrated circuit comprising a biasing circuit for maintaining the transconductance of a Gm cell constant, the integrated circuit comprising an on-chip constant voltage source and an on-chip constant current source, the on-chip constant current source having a connection for an external resistance, the value of the external resistance determining the current generated by the constant current source, characterised in that the biasing circuit comprises: means for providing a first fraction of the current generated by the on-chip current source to bias the output of the Gm cell; means for providing a second fraction of the voltage generated by the on-chip voltage source to bias the input of the Gm cell; and means for controlling the transconductance of the Gm cell to be equal to the ratio of said fraction of the current generated by the on-chip current source to said fraction of the voltage generated by the on-chip voltage source.