Pseudo differential operational transconductance amplifier using common mode feed forward and HD3 feed forward

In this study a low supply voltage CMOS pseudo differential operational trans conductance amplifier (OTA) with CMFF and HD3-FF to improve CMRR and THD is proposed. Common mode rejection ratio (CMRR) is improved by using the common mode feed forward (CMFF) technology and the THD is simulated result of improved by using a HD3 feed forward (HD3-FF). The proposed OTA shown the CMRR is 68.6dB and the THD is lower than -66dB under the input voltage range of 0.1V with 1.2V supply voltage. The chip has been manufactured in a 0.18 μm-CMOS technology and the chip area is 0.69×0.38 mm².