Comparison of Different Precision Pseudo Resistor Realizations in the DC-Feedback of Capacitive Transimpedance Amplifiers

In this paper, three different pseudo resistor (PR) realizations are compared regarding their noise and linearity performance within the DC feedback loop of an integrator-differentiator transimpedance amplifier (I-D-TIA). Thanks to its intrinsic shot noise suppression, the multi-element pseudo resistor (MEPR) shows the best SNDR for small AC signals around a large DC current. In contrast, for large AC signals around comparably small DC currents, the transconductor based PR introduced by Ferrari et al. in [1] displays a rail-to-rail signal swing capability and a small THD of 0.4% resulting in the best achievable SNDR value. All simulations have been performed on transistor level in a 180nm SOI CMOS technology with a 1.8V supply.