Fabio Gozzini Giorgio Ferrari Marco Sampietro An instrument-on-chip for impedance measurements on nanobiosensors with attoFarad resoution. 346-347 2009 ISSCC http://dx.doi.org/10.1109/ISSCC.2009.4977450 conf/isscc/2009 db/conf/isscc/isscc2009.html#GozziniFS09