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High‐performance active RC‐filters realised as a thick or thin‐film hybrid integrated circuit present special fabrication problems. Due to manufacturing tolerances of the circuit elements a vast majority of the filter circuits will probably not meet the performance specifications. As a consequence, the filter networks must be tuned after fabrication. In this paper, two recent algorithms amenable to computer automated functional tuning are reviewed. The algorithms formulate the tuning problem as an optimisation problem which is solved for the tuning amounts required. Then the tuning resistors are adjusted by that amount. The tuning algorithms are tested by examining their performance in tuning an active RC‐filter.

ISHM (UK) presented a technical meeting on this topic on the 23rd October 1982 at the Cunard International Hotel, London. The meeting was attended by some 50 engineers, both those involved in the field of hybrids and potential users. It was generally felt that this was a useful meeting but more especially that it would have appealed to many potential users of hybrids, had the right people been able to be contacted.