Filter arrangement having a transconductance circuit

A filter arrangement comprising a balanced amplifier having an inverting input, a non-inverting input, an inverting output, a non-inverting output, a first input terminal and a second input terminal, a first feedback circuit comprising a first capacitor and arranged between the non-inverting output and the inverting input, and a second feedback circuit comprising a second capcacitor substantially identical to the first capacitor and arranged between the inverting output and the non-inverting input, characterized in that the filter arrangement further comprises a transconductance circuit for providing a variable transconductance, which circuit comprises two inputs connected to the input terminals of the filter arrangement and two outputs coupled to the inverting and non-inverting inputs of the amplifier, said transconductance circuit comprising a plurality of active devices each having a control input terminal and first and second output terminals, the control input terminals of at least two of said active devices being connected to the input terminals of said filter arrangement, respectively, the first output terminals of said at least two active devices being connected directly together and the second output terminals thereof being connected to said inverting and non-inverting amplifier inputs, respectively.