Amplifier, method of manufacturing amplifier, and method of correcting bias current

A method of correcting a bias current of an amplifier that comprises an amplification circuit through which the bias current flows, a first memory configured to store control information specifying the bias current, a digital control circuit configured to generate a bias current setting for setting the bias current based on the control information, a bias circuit configured to determine the bias current in the amplification circuit based on the bias current setting, a second memory configured to store correction information obtained by measuring an actual bias current that flows through the amplification circuit in response to an input of the bias current setting into the bias circuit, and a correction circuit configured to correct the bias current setting based on the correction information and that comprises a multiplier and an adder, the multiplier and adder being configured to correct the bias current setting based on the correction information, the method comprising:

• reading the control information from the first memory;
• generating the bias current setting as a digital signal, in the digital control circuit, based on the control information;
• reading the correction information from the second memory in accordance with the control information;
• correcting the bias current setting based on the correction information by using the multiplier and the adder of the correction circuit, and generating the corrected bias current setting;
• and
• determining the bias current in the amplification circuit by using the bias circuit in accordance with the corrected bias current setting, and feeding the bias current through the amplification circuit.

A method of manufacturing an amplifier that comprises an amplification circuit through which a bias current flows, a first memory configured to store control information specifying the bias current, a second memory initially storing no correction information, a digital control circuit configured to generate a bias current setting for setting the bias current based on the control information, a correction circuit configured to correct the bias current setting based on the correction information and that comprises a multiplier and an adder, the multiplier and adder being configured to correct the bias current setting based on the correction information, and a bias circuit configured to determine the bias current based on the bias current setting, the method comprising:

• measuring an actual bias current that flows through the amplification circuit in response to an input of the bias current setting into the bias circuit, the bias current setting being uncorrected and based on the control information;
• deriving the correction information based on the uncorrected bias current setting and the measured actual bias current;
• and
• storing in the second memory the derived correction information.