A 10-bit nanoampere level current-steering Digital to Analog Converter

A 10-bit Digital-to-Analog Converter (DAC) in Charted 0.35um technology is presented. The design realizes a 10-bit, 25MS/s sampling rate and 10nA of the least significant bit output current DAC in the current steering structure. The whole DAC consists of synchronous unit circuit, decoding circuit, switch array, voltage-current transition circuit, current source array, output current mirror and so on. The area of the chip is 1.15μm×1.28μm. The power supply is 3.3V, the static power consumption is 4.8mW, the integral nonlinearity (INL) is 1LSB, the differential nonlinearity (DNL) is 1LSB. The test shows that the chip has a good performance on linearity when linearly increasing data is input.