  This paper presents analysis results of the operational transconductance
amplifiers (OTAs) that combine feedforward paths and multistage amplifiers to
achieve high-gain wideband operation as well as frequency compensation. To
analyze multistage feedforward OTAs and provide an intuitive design method, the
single-pole approximation model is employed for each substage of the OTA. Using
the single-pole approximation model, the analysis is carried out from the
two-stage OTA to the four-stage OTA in this work.
