A 0.9V Current-Mode Bandgap Reference with Wideband PSRR Better than 70dB from -40°C to 75°C

This paper provides design of a constant current Bandgap with novel techniques to achieve wideband PSRR better than 70dB across PVT. The usual focus for PSRR improvement is in the output stage of the bandgap reference but it is found that trimming circuit can also limit the PSRR. The proposed bandgap uses an improved trimming switch configuration suitable for trimming the multiple outputs of constant current bandgap while achieving high PSRR over a wide range of frequencies. This design and layout was done in CMOS 180nm technology and a wideband PSRR < -70dB has been achieved in the extracted simulations for temperature range of -40°C to 75°C.