Patent ID: 7113437

Claim:
A charge sensing device comprising charge reference means and sense amplifier system, for sensing the charge of a passive addressable charge-storing device, the system comprising a pair of a first and second charge references connected in parallel and similar to the charge-storing device, said first charge reference having the opposite polarization of the second charge reference, said first and second charge references and the charge storing device having a common input node; first and second pseudo-differential reference sense amplifiers both being connected with output nodes of the respective first and second charge reference, said first and second pseudo-differential reference sense amplifiers being adapted for generating output reference signals to a common reference node; and a pseudo-differential sense amplifier having a first input connected with the common reference node for receiving a common reference input signal and a second input for receiving an output signal from the charge-storing device; whereby the pseudo-differential sense amplifier is enabled to perform a threshold comparison and generating an output sense signal indicative of a polarization state of the charge-storing device.