A 4-bit 1.356 Gsps ADC Using Current Processing Method

Abstract

In this paper, a 4-bit 1.356GS/S analog to digital (A/D) converter using current pre-processing (CMA, DSA) is presented. To achieve low power consumption and high conversion rate, the proposed converter is designed with current mode amplifier (CMA) and each preamplifier includes a dual sense amplifier (DSA). The A/D converter can sample input frequencies above 650MHz with this current mode processing technique. The A/D converter achieves 3.7 effective number of bits (ENOBs) for a 30MHz sinusoidal input and 3.35 ENOBs for a 650MHz input at a 1.356 GHz sampling rate. At 1.356GS/S, the current consumption is 38mA including digital logic with a power supply of 1.8V. The proposed A/D converter is fabricated using a 0.18-mum 6Metal Poly CMOS process and the active area is 0.35mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>