Run the time domain simulation to see the XOR in action. The inputs are offset square waves to demonstrate the XOR works as expected. Note in the plots that when A=B Y is logic low and when A != B Y is logic high. In a real application A and B would be driven by CMOS logic, and Y is can drive a CMOS digital input.
Read more about this circuit on EDNs Design Ideas http://www.edn.com/design/other/4373765/Perform-the-XOR-XNOR-function-with-a-diode-bridge-and-a-transistor.
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