A circuit for making linear the response to a mechanical-electrical transducer gauge having variable impedance means within an electrical detecting circuit including a compensating system comprising a feedback loop provided with an amplifier and a compensating impedance constituted by resistive and reactive components. The feedback loop generates an output electrical quantity equal in amplitude and opposed in phase to that absorbed by the undesired impedances. The amplifier includes a grounded collector transistor. The compensating impedance comprises a resistance and an inductance connected in parallel and connected at the input of the feedback loop. The inductance consists of the primary inductance of a transformer with the secondary of the transformer constituting the input of the feedback loop.
A Schottky gate electrode of a refractory metal silicide is formed on a compound semiconductor, by which the barrier height is maintained satisfactorily even after heat treatment above 800.degree. C. Accordingly, it is possible to form an impurity diffused region using the Schottky gate electrode as a mask and then to effect the recrystallization of the semiconductor or the activation of the impurity by heat treatment, so that source and drain regions can be positioned by self-alignment relative to the gate electrode.
