Title :
Software linearization of DA converters
Author :
Azarian, Michel ; Knudsen, Niels ; Kayssi, Ayman I.
Author_Institution :
Nat. Instruments, Austin, TX, USA
Abstract :
This paper presents a method for achieving increased resolution in Nyquist-rate DA converters, by using techniques from over-sampling DA converters. After characterizing the linearity errors of the DA converter, we use a software implementation of the method to pre-distort the digital code before sending it to the converter. The conversion of the pre-distorted signal causes an improvement in effective resolution of the generated analog signal from 12 bits to an equivalent of up to 16 bits for the National Instruments 5411 board.
Keywords :
Nyquist criterion; digital-analogue conversion; linearisation techniques; Nyquist-rate DA converters; digital code predistortion; digital-analog converters; linearity errors; software linearization; Analog-digital conversion; Error correction; Harmonic distortion; Instruments; Linearity; Noise reduction; Noise shaping; Quantization; Signal resolution; Transfer functions;
Conference_Titel :
Circuits and Systems, 2003 IEEE 46th Midwest Symposium on
Print_ISBN :
0-7803-8294-3
DOI :
10.1109/MWSCAS.2003.1562206