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A new differential voltage follower based on bulk-driven transistors is presented. The constant differential gain with value close to unity, input common-mode suppression and rail-to-rail operation are the most important advantages of the proposed structure. The voltage follower can be used as the input stage of a gate-driven differential pair stabilising its gate-transconductance for rail-to-rail input common-mode range. The proposed circuit was designed and tested using standard 0.18 m CMOS process with 1 V supply voltage.