Battery-Operated Twinax/Twisted-Pair Receiver
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
This circuit is used to receive a differential signal from either a twinax cable or a twisted pair cable and, using only battery power, converts this signal to a TTL logic stream. In operation, when a logic '1' is applied to node +IN2 or +IN1, respectively, the comparators force node A or B to a TTL logic '1'. When a logic '0' is applied to node +IN2 or +IN1 and a logic '1' is applied to node -IN2 or -IN1, respectively, the comparators force a TTL logic 0 on node A or B. SW1 is closed to supply power to the circuit. SW2 is set to select either the twinax path A or the twisted-pair path B. The twinax lines are connected to +IN2, -IN2, and G, respectively. The resistor dividers RI1-RF1 and RI2-RF2 are designed to allow +/- 30 mv of hysteresis at the comparator inputs 1,2 when the common range is 0 volts.