A high-gain high-current-efficiency OTA

In order to enhance the current efficiency of gain-boosting OTA, the current recycling technique has been used in main OTA, auxiliary OTA and its common-mode feedback circuit. Implemented in 5 V HHGrace 0.35 μm CMOS process, simulated results show that the improved OTA possesses high DC gain (> 121 dB), high current efficiency (> 1 146 MHz*pF/mA) and wide differential output dynamic range (> 9 V).