Highly-linear, current-feedback resistive source-degenerated MOS transconductor

Compact current-feedback resistive source-degenerated CMOS transconductors have been designed in 0.35 /spl mu/m CMOS twin-well process. The proposed transconductors possess a superior linearity performance and with a similar level of g/sub m//current efficiency compared to an ordinary source-degenerated transconductor. They require no extra bias current source owing to a feedback cross-coupling and current-reuse technique. A single unit G/sub m/ of 30 /spl mu/m operates under 3.0 V supply voltage and consumes 36 /spl mu/A with an input range of /spl plusmn/0.8 V. Compared to the conventional G/sub m/ it achieved better THD performance as much as 10 dB with an input amplitude up to 0.8 V and frequency up to 1 MHz.