A high PSR voltage reference for DC-to-DC converter applications

This paper presents a new 1.2 V high power supply rejection (PSR) voltage reference. The proposed design employs a high-PSR pseudo floating voltage source and a differential-to-single-ended R-MOS capacitor signal-conditioning circuit to achieve high PSR performance metric. The high-PSR pseudo floating voltage source consists of the merged design of two Brokaw´s reference circuits. The proposed bandgap voltage reference is designed and simulated using CSM 1.8 V/3.3 V 0.18 mum CMOS process technology. At a single 3.3 V supply, the simulation results have shown that the reference output voltage can achieve a temperature coefficient of 24.5 ppm/degC over the temperature range from -40degC to 125degC. The PSR is -92.2 dB at dc or very low frequency, -61.8 dB at 1 MHz and -42.7 dB at 10 MHz, thereby showing that the proposed voltage reference is suitable for DC-to-DC converter applications.