A new versatile analogue building block is described, termed an operational floating conveyor (OFC). The OFC has similar transmission properties to the current conveyor and current-feedback operational amplifier, but with a differential current output which allows accurate output current sampling. This feature improves circuit building block versatility and allows accurate closed loop current amplifiers and current convenors to be realised, including a closed loop current conveyor.
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Toumazou et al. (1991) studied this question.
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