The Specialized Integrated Operational Amplifier with Four Inputs for Reducing of Error Signal Offset Voltage in Integrated Cartesian Loop in process 180 nm

For modern systems working with amplitude modulated signals the high linearity power amplifiers is required. One of methods of linearization allows signify decrease the 3rd order intermediation products is Cartesian feedback. The offset voltages, which arises when integrated system on chip worked, disturbed work of mixers, at result efficient of linearization is decreased. In the article the specialized operational amplifier with four inputs is described, it use as error amplifier, in Cartesian systems for decreasing of output offset voltage. Amplifier was design in process 180 nm CMOS, has unity gain frequency is 10 MHz, gain is 105 dB. Input voltage noise at frequency 10 kHz is 8.5nV√Hz. Consumption current is 4.5 mA.