Sigdel Line Driver
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-29
Disclosed is a Limited Distance Modem (LDM) transmit front end circuit. The architecture of such a front end conventionaly includes a D/A converter, a filter for outband noise supression and a line driver. The advent of wide band Sigma-Delta conversion and CMOS logic now makes it possible to implement the three functions together. In the case of LDM multidrop lines, an impedance switching function can also be added with few extra components. The result is a drastic reduction of the front end number of parts and cost.