CALIBRATION TECHNIQUE FOR CURRENT STEERING DAC

摘要

The disclosure provides a current steering digital to analog converter (DAC) that includes a plurality of DAC elements. At least one DAC element of the plurality of DAC elements is coupled to a calibration circuit. The calibration circuit includes a fixed current source coupled to a primary node of the DAC element through a first estimation switch. A digital code generator is coupled to the primary node, and generates a first digital code corresponding to a primary voltage generated at the primary node. The digital code generator generates a second digital code. A correction DAC is coupled to the digital code generator and generates a bias voltage based on the second digital code. The bias voltage is provided to the DAC element such that a current flowing through each DAC element of the plurality of DAC elements is equal.

主权项

1. A current steering digital to analog converter (DAC) comprising:
a plurality of DAC elements, at least one DAC element of the plurality of DAC elements coupled to a calibration circuit, the calibration circuit comprising:
a fixed current source coupled to a primary node of the DAC element through a first estimation switch;a digital code generator coupled to the primary node, and configured to generate a first digital code corresponding to a primary voltage generated at the primary node, the digital code generator configured to generate a second digital code; anda correction DAC coupled to the digital code generator and configured to generate a bias voltage based on the second digital code, the bias voltage is provided to the DAC element such that a current flowing through each DAC element of the plurality of DAC elements is equal.