Dynamic Self-Regulated Charge Pump With Improved Immunity to PVT Variations

A charge pump (CP) design that simultaneously reduces current mismatch and sensitivity to process, voltage, and temperature variations is presented. The self-biased and self-regulated circuit uses a dual-feedback mechanism with a replica CP to dynamically stabilize and equalize the currents over a wide output voltage range under varying operating conditions. The circuit is further analyzed and designed in 90-nm CMOS. Extensive corner and Monte Carlo runs are used to verify its current matching capabilities as well as its stability and response within a phase locked loop. The CP achieves near perfect current matching for a wide output voltage range and for temperatures ranging from -30 °C to 90 °C and a power supply between 1.08 and 1.32 V.