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Research in analog integrated circuits has recently gone in the
direction of low-voltage (LV), low-power (LP) design, especially in
the environment of portable systems where a low supply voltage,
given by a single-cell battery, is used. These LV circuits have to
show a reduced power consumption to maintain a longer battery
lifetime as well. In this area, traditional voltage-mode techniques
are going to be substituted by the current-mode approach, which has
the recognized advantage to overcome the gain-bandwidth product
limitation, typical of operational amplifiers. Then they do not
require high voltage gains and have good performance in terms of
speed, bandwidth and accuracy. Inside the current-mode
architectures, the current-conveyor (CCII) can be considered the
basic circuit block because all the active devices can be made of a
suitable connection of one or two CCIIs. CCII is particularly
attractive in portable systems, where LV LP constraints have to be
taken into account. In fact, it suffers less from the limitation of
low current utilisation, while showing full dynamic characteristics
at reduced supplies (especially CMOS version) and good high
frequency performance. Recent advances in integrated circuit
technology have also highlighted the usefulness of CCII solutions
in a large number of signal processing applications.
This concise and modern book on current conveyors considers first and second-generation devices in a general environment and for low-voltage low-power applications. It constitutes an excellent reference for analogue designers and researchers and is suitable as a textbook in an advanced course on microelectronics.
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