Expanding functional capabilities of thermionic vacuum integrated microcircuits as exemplified by an a.c. amplifier

This paper deals with circuit design aspects of making the a.c. amplifier based on the potentials and specific features of the process of anodic oxidation of aluminium to form dielectric substrates of cathode-heating assemblies (CHA) and anode-grid assemblies (AGA). Design and technological methods are described that are used to make active (five vacuum microtriodes) and passive (resistors, capacitors, commutation) elements. As compared to earlier devices, the a.c. amplifier vacuum integrated microcircuits (VIMC) are more economical and have better characteristics in terms of miniaturization and integration. Its fundamental peculiarities are the use of two-sided through-anodizing to form dielectric substrates with microrelief and superfine-structure grids of microtriodes. Some characteristics of the a.c. amplifier VIMC are given and ways of improving them are discussed