Functional Trimming

Abstract

With increased application of hybrids, methods have been developed enabling resistor films to be cut away until the resistor has precisely the required value for correct functioning. Passive trimming is giving way to active or functional trimming where the frequency response itself is adjusted using a sine wave generator and waveform analysis equipment. Some of the problems encountered in trimming are discussed, including those caused by the high energy laser light itself; the effect on active circuits caused by the generation of Ipp currents; and DC offset or level shifts produced by low level light. The importance of producing a system in which laser, instrumentation and computer are programmed in one language is emphasised. Finally the advantages of functional trimming are summarised.

Citation

Thompson, P. (1985), "Functional Trimming", Microelectronics International, Vol. 2 No. 2, pp. 22-23. https://doi.org/10.1108/eb044173