Output interface circuit between two circuits of different natures

Claim 1

An output interface circuit, designed to match output voltages of a first digital circuit on GaAs or group III-V materials with input limit values of a second digital circuit, of an ECL type, on silicon, said output interface circuit comprising: a voltage and current amplifier that receives, at a gate of its input transistor, a signal coming from an output of the first digital circuit; a first stage for controlling a high level of an output voltage of said interface circuit, formed by a diode in series with a switch transistor, said diode connected to a drain of said switch transistor, a gate of said switch transistor receives the signal coming from the voltage and current amplifier, and a source of which is connected to an output of the interface circuit, towards the second digital circuit, a second stage for controlling a low level of said output voltage of said output interface circuit, formed by two diodes in series, mounted in parallel with said first stage and connected to the output of the interface, said first and second stages being supplied between a voltage V dd =0 V applied to the diodes and a call-back voltage of V TT =-2 V.