Digital to analog converter offset autocalibration system in a d

Details Digital to analog converter offset autocalibration system in a d Digital to analog converter offset autocalibration system in a d

1997-02-05

1999-04-13

Williams, Howard L.

Coded data generation or conversion

Converter compensation

341120, H03M 106, H03M 110

Patent

active

058942807

ABSTRACT:
A digital to analog converter (DAC) offset autocalibration system in a digital synthesizer integrated circuit. The present invention includes a DAC coupled to a filter. The input of the DAC accepts digital values for conversion to an analog signal. The output of the DAC is coupled to the input of the filter. The filter smoothes the analog signal received from the DAC. A switch is coupled to the filter output to receive the analog signal. A comparator is coupled to the switch. The input of the comparator receives the analog signal from the filter output via the switch. An autocalibration control circuit is coupled to the output of the comparator, to the switch, and to the DAC. The autocalibration control circuit is adapted to input a value to the DAC in order to determine an offset correction from the output of the comparator and adjust the analog signal using the offset correction.

REFERENCES:
patent: 4835535 (1989-05-01), Shibayama et al.
patent: 5087914 (1992-02-01), Sooch et al.

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