A nanoscale CMOS charge pump with near perfect current matching

A drain-switching charge pump (CP) design is presented with near perfect current matching and extended flat current response over a range of process, voltage, and temperature variations. Current mismatch is compensated dynamically without the need for a replica charge pump or extended digitally-assisted calibration routines. The self-regulated circuit uses several simple yet effective feedback mechanisms to overcome the basic shortcomings of nanometer devices and reduced power supplies. The circuit is designed in 90nm CMOS and simulated extensively using Monte Carlo analysis while sweeping the operating temperature to provide statistically relevant operating conditions. The proposed design achieves near perfect current matching at output voltages between 0.16V and 0.98V for temperatures ranging from -30 to 90 degrees Celsius and a power supply between 1.08V and 1.32V.