Integrated switched capacitor circuit and method

Integrated switched capacitor circuit comprising: a transconductance amplifier (151a, ..., 151n) having two input transistors with a predefined design the channel length; a bias current circuit (470) for the transconductance amplifier (151a, ..., 151n) having a first (477) and at least a second (476) transistor and a control circuit which is formed identical currents (through the first and second transistors of the transconductance to drive 470) and a bias current for the transconductance amplifier (151a, ..., 151n output); (, ..., 151n 151a) is switchably connected to at least one switched capacitor (154, 155) connected to the input of the transconductance amplifier; an RC tuning circuit (410) with a resistor (R