Patent ID: 8093945
Filing Date: 2012-01-10
Classification: H03F

Abstract:
1. A method of controlling an amplification stage, comprising: a. selecting a linearity objective for the amplification stage; b. measuring at least one amplifier dependent characteristic in dependence on at least one amplifier independent characteristic; c. determining a preferred combination of bias and supply inputs to achieve the linearity objective based on said measurements; d. creating a searchable database of said amplifier dependent and independent characteristics; e. searching said database to simultaneously determine the optimum combination of bias and supply voltage at each input power over the measurement range to achieve the linearity objective; f. in dependence on an input signal to said amplification stage, determining a combination of supply input and bias input for the amplification stage in order to meet said linearity objective; g. in dependence on there being more than one combination of supply input and bias input for meeting the linearity objective, selecting the combination that optimises efficiency for the amplification stage; and h. applying the supply voltage and the bias voltage based on said determined combinations.