Patent ID: 7639082

Claim:
A method for calibrating a signal gain of an amplifier circuit, the method comprising: determining an operating temperature of the amplifier circuit; setting the amplifier circuit to an initial gain setting; determining an initial signal gain of the amplifier; repeating the setting and the determining of a signal gain for remaining gain settings of the amplifier circuit to determine a signal gain for each gain setting; and computing a gain slope for each gain setting, wherein for each gain setting, the computing comprises fitting a curve through the signal gain and a reference signal gain associated with the gain setting, and computing the gain slope from the curve, and wherein the curve comprises a line described as g k = g k,ref +α k ( T−T ref ), where g k is an amplifier signal gain for gain setting k at temperature T, g k,ref is a reference gain point for gain setting k, T ref is a reference temperature, and α k is a slope of the amplifier signal gain with respect to temperature.