Digital calibration of transmit digital to analog converter full scale current

摘要

A method and apparatus for a method of calibrating a transmit digital to analog converter full-scale current. The method comprises generating a tuned reference current and then calibrating the tuned reference current to a selected value in order to produce a predetermined current value. The calibration further comprises dividing a reference voltage input over a resistor string. A band gap current is then generated using the divided reference voltage input. A tuned current output is then produced from a current steering digital to analog converter with the tuned output current stored in a register. The reference current for the transmit DAC is then generated based on the stored tuned output current.

主权项

1. A method of calibrating a transmit digital to analog converter full-scale current, comprising:
generating a tuned reference current; and calibrating the tuned reference current to a selected value to produce a predetermined current value, wherein the calibrating the tuned reference current comprises: dividing a reference voltage input over a resistor string; generating a band gap current using the divided reference voltage input; producing a tuned current output from a current steering digital to analog converter; storing the tuned output current from the tuned current steering digital to analog converter in a register; and generating the reference current for the transmit digital to analog converter based on the stored tuned output current.