A bit cell is presented which can provide a small weighted current without loss of switching speed. The bit cell contains a switch which is responsive to an applied control signal to direct the weighted current to an output or to divert it away from the output. Supplementary currents are supplied to...http://www.google.com/patents/US4405916?utm_source=gb-gplus-sharePatent US4405916 - Digital-to analog converter having supplementary currents to enhance low current switching speed
