Electrical circuit comprising a trim circuit

An apparatus comprising:

• a first electrical circuit that has one or more characteristics, the first electrical circuit comprising a first trim circuit having a first trim value that is variable, the, or each, characteristic of the first electrical circuit being adjustable based on the first trim value of the first trim circuit;
• and
• a first tag comprising first functional circuit information and/or first trim circuit information, the first functional circuit information and/or the first trim circuit information being encoded in the first tag;
• wherein:
• the first functional circuit information and/or the first trim circuit information stored in the first tag is configured to be readable;
• and:
• the first functional circuit information and/or the first trim circuit information is suitable for determining the first trim value for the first trim circuit that results in the, or each, characteristics of the first electrical circuit meeting a first design specification;
• and:
• determining the first trim value comprises applying a first trim model.