  Precision instrumentation systems, such as optical receivers and other
current-output measurement systems, often contain a transimpedance amplifier
(TIA). The commonly used resistive feedback TIA (RF-TIA) has a drawback in its
practical implementation; the system bandwidth is limited by the feedback
resistor and its parasitic capacitance in high-speed applications. To overcome
this drawback, a capacitive feedback TIA (CF-TIA) can be used. The gain and
bandwidth performance of the CF-TIA are theoretically equivalent to those of
the RF-TIA. Although CF-TIA has been introduced in previous studies for
reducing thermal noise and addressing the difficulty in integrating a high
resistance with CMOS technology, past analyses have not been in sufficient
depth. The ultimate goal of this study is providing designers in this field
with helpful design rules and analytical tools. In particular, a transfer
function model, the critical design parameters, and a stability analysis are
presented. Furthermore, a new CF-TIA configuration involving a simplified
integrator DC feedback loop is introduced, which can be deployed as a single
stage rather than the conventional two-stage topology. While the applications
considered in this study were high-speed sensor measurements and devices with a
high input capacitance, such as a laser position detector, the analytical
results obtained herein also applicable to a variety of other applications such
as emerging biosensors and optical communication system.
