In one embodiment, a method includes measuring two or more output signals, calculating a plurality of reconstructed values, and determining a position of an object relative to a touch sensor based at least on the plurality of reconstructed values. Each output signal is associated with one of two or more differential integrators. Each differential integrator includes first and second inputs connected to respective electrode tracks of the touch sensor and an output configured to generate the output signal proportional to a difference between signals received at the first and second inputs. The differential integrators are chained such that each electrode track is associated with a previous electrode track connected to the first input of the differential integrator whose second input is connected to the electrode track and a next electrode track connected to the second input of the differential integrator whose first input is electrically connected to the electrode track.