An operational transconductance amplifier(OTA),which has been successfully applied to the chip of ultra-low power low-dropout(LDO) voltage regulator is presented.

A low-supply-voltage and low-power Miller operational transconductance amplifier(OTA) with rail-to-rail input/output swing was designed,applied bulk-driven differential pair and DC level shifters technology for reducing the requirement of supply voltage with MOS transistors work in the weak inversion thus achieved low supply voltage,low power and full swing.

Taking calculation of the gain of universal two order filter on OTA s as example,an open-loop method was extended to the system with multiple feedback paths.

A high-speed CMOS operational transconductance amplifier;

Full-integrated operational transconductance amplifier(OTA)active filter design method is studied and a practical procedure to derive the OTA active filter from the prototype of doubly terminated LC passive filter is presented.

Design of a Low-Voltage CMOS Folded-Cascode OTA;

To deal with the frequency limitation of the multi output OTA based filters, a novel canonical realization of continuous time current mode CMOS OTA C biquad filter based the elementary operational transfer amplifier (OTA) with the only one output is proposed employing SFG (signal flow graph) and a various different kind of biquadratic filters is generated systematically.

Based on HBT’s advantages such as high transconductance, small parasitic capacitance and low noise, a fully differential operational transconductance amplifier (OTA) using TSMC 0.