A preamplifier circuit comprises a first pair of transistors and a second pair of transistors having current flow paths therethrough coupled at first and second output nodes and providing first and second current flow lines intermediate a supply node and ground. The two pairs of transistors comprise: first and second input transistors located intermediate the outputs nodes and one of the supply node and ground providing respective input nodes, first and second load transistors intermediate the output nodes and the other of the supply node and ground. The load transistors have control terminals capacitively coupled to the other of the supply node and ground and a reset switch arrangement is provided periodically activatable to short the first output node, the second output node as well as the control terminals of the first load transistor and the second load transistor.