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Cable Sense Amplifier for Loop Through Connections with DC Adjust

Cable Sense Amplifier for Loop Through Connections with DC Adjust

This circuit shows a means of providing a multidrop tap amplifier using the differential input LT6552. This circuit taps the cable (loop-through configuration) at a high impedance and then amplifies the signal for transmission to a standard 75Ω video load (a display monitor for example). The looped-through signal would continue on to other locations before being terminated. The exceptional common mode rejection of the LT6552 removes any stray noise pickup on the distribution cable from corrupting the locally displayed video. This method is also useful for decoupling of groundloop noise between equipment, such as in automotive entertainment equipment. To operate on a single supply, the input signals shown (shield and center of coax feed) should be non-negative, otherwise a small negative supply will be needed, such as the local –3V described earlier