Thomson Composants Microondes

Thomson-Csf

Jean-Yves Danckaert

Ernesto Perea

This interface constitutes an adaptation of the output signals of a first circuit, made of silicon for example, to the limit values of the input signals in a second digital circuit, made of GaAs for example. It includes a first stage (A) consisting of two parallel-mounted shifters, in which the input signal (E) and a reference (Ref) are shifted. A second stage (B), of the BFL type, compares these two values and a third stage (C) regenerates and amplifies the signals. A fourth stage (D) may give a complementary value. This interface is integrated into the chip of the second digital circuit which is made of GaAs.

Interface circuit between two circuits of different logic types

This interface constitutes a matching of the output signals of a first circuit, made of GaAs for example, with the limit values of the input signals of a second digital circuit, made of silicon for example. It has a current amplifier which receives the output signal of the GaAs circuit. The voltages at the high level are controlled by a diode in series with a transistor which is then on. At the low level, the transistor is off, and it is two diodes, in parallel with the transistor, that control the output voltage. This interface is integrated into the chip of the digital circuit, made of GaAs. Single figure.

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Les Ulis, France

Jean-Yves Danckaert