Digitally controlled precision current source with

专利名称：Digitally controlled precision current source

with an open loop compensation circuit

发明人：Myron J. Koen申请号：US06/365194申请日：19820405公开号：US04458201A公开日：19840703

摘要：A precision current source includes a current source transistor and a currentsteering circuit which selectively directs the output current from the current sourcetransistor through either a first or a second current path in response to a digital inputsignal. A compensation circuit directs a highly accurate steady state current through firstand second series coupled compensation transistors. The base of the secondcompensation transistor is coupled to the base of the current source transistor. Thecompensation circuit operates to control the voltage differential between the base ofthe current source transistor and a voltage source to maintain the output currentintermittently steered through the second current path precisely constant regardless ofchanges in the beta of the current switching transistor or changes in the beta or base toemitter voltage of the current source transistor.

申请人：BURR-BROWN RESEARCH CORP.

代理机构：Cahill, Sutton & Thomas

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