A high PSR over wideband frequency range low dropout voltage regulator
An improved low dropout regulator (LDO) with high power supply rejection (PSR) over wideband frequency range is presented in this paper. The proposed design employs the supply ripple subtraction and high pass filtering to achieve high PSR performance. The proposed LDO is fabricated by TSMC 0.35um 2 poly 4 metal CMOS process. The simulation results for a 50 mA load current show that the PSR is 69 dB at 10 kHz, 59 dB at 100 kHz, 53 dB at 1 MHz, and 58 dB at 10 MHz. The results show that the proposed design is suitable for switching mode DC DC converter and SoC applications. The active area of the LDO is 270 x 320 um2.
The 2010 International Conference on Green Circuits and Systems