Pinch Resistor Tracking Constant Current Source
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
A standby offset voltage for a static pinch resistor random access memory cell 10, connected to word top line WT1 and word bottom line WB1, is maintained by a circuit 12 which maintains the cell current I proportional to the reciprocal of the value of the pinch resistor R(P1) or R(P2) The circuit 12 includes a reference pinch resistor R(P3) wherein the same or a similar voltage is developed as that developed across either pinch resistor R(P1) or R(P2) to provide desired tracking, resulting in lower nominal standby power. By making the cell current I a function of the reciprocal of the value or magnitude of the pinch resistor R(P1) or R(P2), the offset voltage between the bases of the multi-emitter flip-flop transistors T1 and T2 becomes substantially constant.