Using Series Array Interferometer Logic (SAIL) components, we have dem
onstrated an HTS gate driving an exclusive OR, whose second input is b
eing driven at 1 GHz. This digital technique serves as an output inter
face: data is placed on an rf carrier as phase information (Phase Shif
t Keying). Low voltage, baseband, differential data can be amplified b
y low noise, narrow bandwidth, single-ended amplifiers. A simple demod
ulator completes the connection to standard semiconductor electronics.