High-resolution digital to analog converter

摘要

A system includes an N-bit digital-to-analog converter and an M-bit sub-digital-to-analog converter. The N-bit digital-to-analog converter includes 2N resistances connected in series across first and second reference voltages and converts N most significant bits of B bits of data. The M-bit sub-digital-to-analog converter converts M least significant bits of the B bits of data. The M-bit sub-digital-to-analog converter includes a first converter that converts a voltage across one of the 2N resistances to a first current, a current-mode digital-to-analog converter that interpolates the first current and outputs a second current, and a second converter that converts the second current to an output voltage representing the N most significant bits and the M least significant bits of the B bits of data.

主权项

1. A system comprising:
an N-bit digital-to-analog converter that comprises 2N resistances connected in series across first and second reference voltages and that converts N most significant bits of B bits of data; and an M-bit sub-digital-to-analog converter that converts M least significant bits of the B bits of data, wherein the M-bit sub-digital-to-analog converter comprises: a first converter that converts a voltage across one of the 2N resistances to a first current; a current-mode digital-to-analog converter that interpolates the first current and outputs a second current; and a second converter that converts the second current to an output voltage representing the N most significant bits and the M least significant bits of the B bits of data.