Dirk Wouter Johannes Groeneveld

A self-calibration technique for monolithic high-resolution D/A converters

A D/A (digital/analog) and A/D (analog/digital) self-calibrated technique is presented which does not need a calibration period, additional trimming, or external component and is insensitive to process variations. The technique is based on calibration of a current source. The basic block diagram of a 16-bit D/A converter is shown. The common calibration circuitry is also presented. The measured signal-to-noise ratio, including harmonic distortion, versus the output voltage of the 16-bit DAC is shown.<<ETX>>

A 10-b 40-MHz 0.8- mu m CMOS current-output D/A converter

A 10-b binary-weighted D/A digital-to-analog converter based on current division is presented. The effective resolution bandwidth is 5 MHz at a maximum clock frequency of 40 MHz. The circuit is integrated in a 0.8- mu m double-metal CMOS technology and the chip area is 0.4 mm/sup 2/. This particular converter was realized by constructing the bit currents through a careful combination of unit current sources and by limiting the driving voltage on the gates of the current switches. >

An Oversampled Multi-bit CMOS D/A Converter For Digital Audio With 115dB Dynamic Range

The analog part of a current-mode CMOS 5-b bidirectional digital/analog (D/A) converter for digital audio with 115-dB dynamic range and -90-dB distortion at 128-times oversampling is presented. The application of a multibit noise shaping approach combined with a sign-magnitude decoding in an oversampled D/A converter not only increases the dynamic range of the converter but also reduces the intermodulation sensitivity. A dynamic self-calibration technique is used to obtain the required relative accuracy and absolute linearity of the current sources. No laser or external trimming techniques are required. >