Low power current mode pipelined A/D converter with 2.5-bit/stage and digital correction

This paper presents a novel prototype low power current mode 9-bit pipelined A/D converter. The A/D converter structure is composed of three 2.5-bit and one 3 bit stages operating in current mode and final comparator which converts the analog current signal into digital voltage signal. All building blocks of the converter have been designed in CMOS AMS 0.35 ¿m technology, then simulated, fabricated and measured to verify proposed concept. The performances of the converter are compared to performances of known voltage mode SC and current mode SI converter structures. Low power consumption and small chip area are advantages of the proposed converter.