Voltage Reference Generator for Audio Interface in 55nm CMOS Technology Node

This paper presents a fully integrated 55nm CMOS Voltage Reference Generator for audio interface. The reference is made up of a Bandgap voltage reference and a Low-Dropout regulator. The topology chosen for the bandgap is a current mode bandgap with adjustable output resistor. This guarantees a reference voltage of less than 1.2V thanks to the sum of two currents instead of two voltages. A double loop was chosen for the LDO regulator to ensure rapid transient response. For BG, current consumption is less than 5uA, DC PSR lower than -60dB and a temperature coefficient around 70ppm/°C. The LDO has a PSR of around -70dB in the audio band ([20, 20K]Hz) and a current consumption of around 10uA and 5uA for Normal Mode and Low Power mode respectively.