A prominent select free is a type of term used in electrical engineering used to express the volume of a 3-state BJT or BSC or similar voltage-clamped circuit. The terms are used synonymously. Excluding the number symbol N, the select free formula for the 3-state BJT is given by the expression;
$K\; =\; \backslash frac\{Classic\; Feedback\; Gain\; Voltage\; Gain\; BJT\; CWMF\; QICSnTC\}$
Where K is the select free, CWMF is Common-Mode Feedback Voltage Ratio of precision class and CSFB is Common-Source Feedback Voltage Ratio of precision class.
Where Q is the ratio of the current gain and the load current expressed in dB (in the case of a selection gate, this is expressed in terms of the magnitude of the input bias current IBS) and is equal to
$Q=\backslash frac\{I\_\{DS\}\}\{I\_\{SS\}\}$
Where I-D is the drain current of the device and I-S is the source current, expressed in terms of IB.
$I\_\{DS\}-I\_\{SS\}=I\_\{SEL\}\backslash frac\{\backslash IB\; I\_\{DS\}-I\_\{DS\}\}\{\backslash IB$