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A new current-mode circuit for realizing CMOS digitally controlled decibel-linear variable gain amplifier (VGA) is proposed for ultra-wideband systems. The core block of this VGA is a series of programmable current-amplifier cells which are connected by a switch array. Some cells can be cut off under certain gain modes to save the power. Designed in 0.18..m CMOS technology, the VGA provides a 45d...
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