Thin-Film Hybrid Microcircuit Wide-Band Noise Generator

摘要

The knowledge and experience gained through previous fabrication and evaluation of thin-film components in the Electronic Components Laboratory is applied to an electronic circuit known as a 'wideband amplitude noise generator.' The thin-film noise generator illustrates how thin-film hybrid microcircuits are produced and indicates some of the thin-film microcircuit techniques and capabilities available to ECOM personnel ('in-house'). Relatively large value capacitors (.01 microfarads) and resistors (700 kiloohms) are achieved, on a common substrate, through the use of thin-film techniques. High parameter stability for the passive components is possible with a temperature annealing process. The problem of low, non-destructive, breakdown voltages, inherent in large area capacitors with thin dielectric materials, is overcome by application of a voltage pulse to the capacitors. This voltage application serves to remove incipient points of low breakdown strength by virtue of the self-healing property of thin-film capacitors with aluminum electrodes. Finally, frequency changes in the relaxation oscillator with ambient temperature changes are predicted by means of developed equations. (Author)