High band width emitter coupled logic gate

Claim 1

A high band width current switch logic circuit comprising: a. a current switch logic circuit having input terminals for receiving logic signals, b. a first emitter-follower output transistor coupled to said current switch logic circuit for providing drive to a first load, and the emitter terminal of said first emitter-follower output transistor constituting a in-phase output terminal means, c. a second emitter-follower output transistor coupled to said current switch logic circuit for providing drive to a second load, and the emitter terminal of said second emitter-follower output transistor constituting an out-of-phase output terminal means, d. a first switchable current sink means responsive and coupled to a first internal voltage switching node of said current switch logic circuit and coupled to the emitter terminal of said first emitter-follower output transistor for providing a substantially fixed value of current flow through said first emitter-follower output transistor during switching and quiescent operation of said current switch logic circuit in response to said logic signals, and e. said first switchable current sink means including a first switchable current source means and an active voltage translating circuit means coupled between said first internal voltage switching node and said first switchable current source means for selectively placing said first switchable current source means either in a high switchable or low conductive state.