A CMOS operational transconductance amplifier (OTA) using a fully differential single-stage core OTA as the input stage and a differential to single current converter as the output stage, each biased at a separate current level, is presented. A large gain-bandwidth product (2.7 MHz) and a high slew-rate (5 V/μs) can be obtained by applying a large bias current to the core OTA. Due to the class-AB operation of the output stage, a high output impedance can be obtained by applying a small bias current to the output stage, resulting in a high DC-gain (61.6 dB). When the performance of this class-AB OTA is compared with that of basic single-stage OTAs it is found that the output impedance of the class-AB OTA is increased without limiting the bandwidth or slew-rate
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机译：提出了一种CMOS运算跨导放大器（OTA），该器件使用全差分单级核心OTA作为输入级，并使用差分至单电流转换器作为输出级，每个偏置在单独的电流水平上。通过对核心OTA施加较大的偏置电流，可以获得较大的增益带宽乘积（2.7 MHz）和较高的转换速率（5 V /μs）。由于输出级的AB级操作，可以通过向输出级施加小的偏置电流来获得高输出阻抗，从而获得高DC增益（61.6 dB）。将这种AB类OTA的性能与基本单级OTA的性能进行比较时，发现AB类OTA的输出阻抗会增加而不会限制带宽或压摆率
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