1 GHz High Sensitivity Differential Current Comparator for High Speed ADC

B S Patro, Suman Biswas, Indrani Roy, B. Vandana

Abstract


A fast responding low power differential current comparator operating at 1 GHz clock speed is presented in this paper. The comparator proposed in this paper is composed of three stages. The paper presents a modified version of Wilson's current mirror comparator for the detection of very low current. This serves as the first stage which is current to voltage conversion followed by comparison stage and buffer stage. Working at a supply of 1.8 V, the comparator is capable of sensing a minimum difference of 4 nA for 6 µA reference current. In addition to low power dissipation this circuit shows a swift response resulting in a propagation delay which is less than 0.9 ns for an input difference of 0.1 µA. The current comparator is simulated using Cadence Virtuoso Analog Design Environment 0.18 µm CMOS technology


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References


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