Abstract.A low power, low voltage current mode 9 bit pipelined a/d converter and 8 bit self-calibrated d/a converter to interface a DSP system are presented in the paper. The a/d converter is built of 1.5 bit stages with digital error correction logic. The d/a converter is composed of 3 LSBs fine and 5 MSBs coarse current mode converters. The a/d and d/a converters were designed in 0.35 µm technology, then fabricated to verify the proposed concept. The performances of both converters are compared to the performances of known converter structures. The main advantages of the proposed converters are low power consumption and small chip area.

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This paper, presents a novel low power current mode 9 bit pipelined a/d converter. The a/d converter structure is composed of three 2.5 bit stages and one 3 bit stage operating in current mode and a final comparator which converts the analog current signal into a digital voltage signal. All the building blocks of the converter were designed in CMOS AMS 0.35 μm technology, simulated, and then a prototype converter was manufactured and measured to verify the proposed concept. The performances of the converter are compared to performances of known voltage-mode switched-capacitance and current-mode switched-current converter structures. Low power consumption and small chip area are the advantages of the proposed converter.