ABSTRACT
The input transconductance is one of the two parameters setting HF openloop (o/l) gain, and therefore has a powerful influence on stability and transient behaviour as well as distortion. Ideally the designer should set out with some notion of how much o/l gain at 20 kHz will be safe when driving worst-case reactive loads (this information should be easier to gather now there is a way to measure o/l gain directly) and from this a suitable combination of input transconductance and dominant-pole Miller capacitance can be chosen.
