This invention relates to source-coupled logic (SCL) which is a functional derivative of emitter-coupled logic (ECL). ECL is widely recognized as having the characteristics of high speed (low propagation delay) and low power supply noise generation. The SCL of the prior art succeeds at maintaining...http://www.google.com/patents/US5798658?utm_source=gb-gplus-sharePatent US5798658 - Source-coupled logic with reference controlled inputs
