A novel on-chip CMOS current sensor implemented by switched capacitors for a current-mode control DC-DC buck converter

A novel on-chip CMOS current sensor implemented by switched capacitors for a current — mode buck converter is presented in this paper. This proposed current sensing circuit does not need another sense MOSFET and a voltage-to-current and current-to-voltage transform circuit. We use the 0.35um DPTM CMOS process to design and simulate this circuit. Test result shows that the accuracy and the speed of the proposed current sensing circuit are high.