1. An apparatus comprising: a biasing circuit comprising two or more bias cells electrically connected in parallel, the two or more bias cells connected to a first bias output node; and a transconductor cell array comprising two or more transconductor cells in parallel with each other, wherein the transconductor cell array is responsive to voltage at a first input, wherein the transconductor cell array is configured to generate a differential output current at a first current output and a second current output, wherein at least one of the transconductor cells is selectively activateable via a first control input to alter the transconductance gain of the transconductor cell array, wherein a biasing input of the transconductor cell array is coupled to the first bias output node of the biasing circuit for transconductance gain control of active transconductor cells, wherein one or more bias cells are selectively activateable in response to one or more second control inputs such that a magnitude of voltage and/or current at the first bias output node varies in relation to a number of the bias cells that are activated.