|
1. A parallel input and dynamic cascaded operational transconductance amplifier (OTA), comprising: a plurality of sub-OTAs, wherein each sub-OTA is configured to operably generate a corresponding transconductance output current according to a differential input voltage which is linearly coupled to the plurality of sub-OTAs, wherein the plurality of sub-OTAs include a first sub-OTA and a second sub-OTA; and at least one cascading capacitor, which is cascaded between the first sub-OTA and the second sub-OTA, wherein the at least one cascading capacitor includes a first cascading capacitor, which is cascaded between the first sub-OTA and the second sub-OTA; wherein a second transconductance output current generated by the second sub-OTA is coupled through the first cascading capacitor to generate an AC coupled (coupled in an alternating current manner) transient bias current on a common mode bias node of the first sub-OTA, thus providing the AC coupled transient bias current to both a non-inverting transconductance current and an inverting transconductance current of a differential pair circuit of the first sub-OTA in a case when a transient state occurs in the differential input voltage corresponding to the first sub-OTA, wherein the non-inverting transconductance current and the inverting transconductance current of the differential pair circuit during the transient state have a phase difference which is sufficiently large that an transconductance output current of the differential pair circuit is enhanced to an extent, so that a loop bandwidth and a response speed during the transient state are enhanced, and during a steady state, the AC coupled transient bias current is reduced, so as to enhance stability through reducing the loop bandwidth.
|
