Common mode rejection coupler

Details Common mode rejection coupler Common mode rejection coupler

1980-04-07

1982-03-23

Dixon, Harold A.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

250551, 307475, 330258, H03F 345, G02B 2700, H03K 342

Patent

active

043214878

ABSTRACT:
A common mode rejection coupler having a pair of optical isolator circuits for receiving input signals which are the complement of one another. The optical isolator circuits generate output signals which are the complement of one another and which are normally isolated from a common mode voltage existing between the input and output of the isolators. The complementary outputs of the optical isolator circuits are shaped and one output is inverted so that both signals are in-phase with one another. The signals are coupled to a voltage divider circuit the output of which is coupled to a Schmitt Trigger. The output of the Schmitt Trigger is in a first state when both signals are high and in a second state when both signals are low. Should a spurious voltage spike be generated at the output of one of the isolator circuits due to a changing common mode voltage, the resulting input signal to the Schmitt Trigger will not change a sufficient amount to cause a change in state of the output of the Schmitt Trigger.

REFERENCES:
patent: 3315176 (1967-04-01), Biard
patent: 3810034 (1974-05-01), Brunsch
patent: 3912951 (1975-10-01), Kihara
patent: 4037170 (1977-07-01), Richards
patent: 4063121 (1977-12-01), Bartlett
"Instrumentation Amplifier Conditions Computer Inputs", by Thomas C. Lyerly, Electronics, Nov. 6, 1972, pp. 115-118.

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