An integrated circuit includes a current mode transmitter. The current mode transmitter includes a first resistor and a second resistor. The resistance of the first resistor is adjusted by measuring the resistance, generating a resistance trimming code based on the measured resistance, and writing the first resistance trimming code to a first register. The resistance of the second resistor is adjusted by generating a second resistance trimming code based on the first resistance trimming code and writing the second resistance trimming code to a second register.