Abstract
This paper proposes a novel low-voltage, low-power wide-bandwidth variable gain amplifier (VGA) cell. The proposed circuit combines source degeneration and current-mode techniques to achieve high linearity and constant bandwidth. Using a 0.35-/spl mu/m CMOS process and dissipating 84 /spl mu/W from a 1-V supply voltage, the proposed VGA cell can have a voltage gain varying from 0 dB to 25-dB DC gain while maintaining a constant bandwidth of 100-MHz.
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