Apparatus comprising: a projected capacitance touch panel, the panel comprising a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode; and a device connected to the first electrodes of the projected capacitance touch panel, the device comprising: a voltage controlled signal source (44, V d ( f d)) configured to generate a periodic signal; a front end module comprising a first stage configured to receive input signals from the first electrodes, to receive the periodic signal, and to output an amplified signal, and a second stage in the form of a first frequency-dependent filter and a second frequency-dependent filter; wherein the first stage comprises an operational amplifier having an inverting input resistively coupled to one or more of the first electrodes, a non-inverting input resistively coupled to the voltage controlled signal source such that the amplifier is provided with a periodically varying virtual earth, an output providing the amplified signal, and a negative feedback network comprising a resistance and a capacitance connected in parallel between the output and the inverting input; wherein the first frequency-dependent filter receives and filters the amplified signal to provide a first filtered signal having a first frequency bandwidth, wherein the first filtered signal is indicative of a pressure applied to the touch panel proximate to the given first electrode; and wherein the second frequency-dependent filter receives and filters the amplified signal to provide a second filtered signal having a second frequency bandwidth, wherein the second filtered signal is indicative of a capacitance of the given first electrode; wherein the second frequency bandwidth has a relatively higher start-frequency than the first frequency bandwidth. a projected capacitance touch panel, the panel comprising a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode; and a device connected to the first electrodes of the projected capacitance touch panel, the device comprising: a voltage controlled signal source (44, V d ( f d)) configured to generate a periodic signal; a front end module comprising a first stage configured to receive input signals from the first electrodes, to receive the periodic signal, and to output an amplified signal, and a second stage in the form of a first frequency-dependent filter and a second frequency-dependent filter; a voltage controlled signal source (44, V d ( f d)) configured to generate a periodic signal; a front end module comprising a first stage configured to receive input signals from the first electrodes, to receive the periodic signal, and to output an amplified signal, and a second stage in the form of a first frequency-dependent filter and a second frequency-dependent filter; wherein the first stage comprises an operational amplifier having an inverting input resistively coupled to one or more of the first electrodes, a non-inverting input resistively coupled to the voltage controlled signal source such that the amplifier is provided with a periodically varying virtual earth, an output providing the amplified signal, and a negative feedback network comprising a resistance and a capacitance connected in parallel between the output and the inverting input; wherein the first frequency-dependent filter receives and filters the amplified signal to provide a first filtered signal having a first frequency bandwidth, wherein the first filtered signal is indicative of a pressure applied to the touch panel proximate to the given first electrode; and wherein the second frequency-dependent filter receives and filters the amplified signal to provide a second filtered signal having a second frequency bandwidth, wherein the second filtered signal is indicative of a capacitance of the given first electrode; wherein the second frequency bandwidth has a relatively higher start-frequency than the first frequency bandwidth.