Method and apparatus for sourcing and sinking current

摘要

A driver circuit for alternately sourcing current to, and sinking current from a load (12) comprises a pair of field effect transistors (20 and 22), each having its drain-to-source portion coupled between the load and a separate one of a pair of voltage sources (VH and VL) which serve to source and sink current, respectively. Each of a second pair of field effect transistors (24 and 26) has its drain-to-source portion coupled between the gate of a separate one of the first pair of field effect transistors and a current source (28). The gate of each of the field effect transistors of the second pair is supplied with a separate one of a pair of electrical signals Vi' and Vi'* which alternately shift in amplitude. The control signals Vi' and Vi'* render the field effect transistors of the second pair alternately nonconductive, thereby rendering the first pair of field effect transistors (20 and 22) alternately conductive to sink and source current, respectively.