A charge pump with power-on reset circuit

A charge pump with power-on reset (POR) circuit is presented. The proposed circuit generates reset signal during supply voltage rising. It uses common capacitor, voltage follower, and current source to make POR signal and later on as usual charge pump. So, it saves the chip area and ensures initial charging of capacitor. Furthermore, the proposed circuit guarantees that reset signal appears when supply voltage achieves strictly specified value. As a result all elements are set to their initial states correctly.