Design of a wideband transmit delta-sigma DAC

Author

Neitola, Marko ; Kivi, Arto ; Rahkonen, Timo

Author_Institution

Dept. of Electr. Eng. & Infotech Oulu, Oulu Univ., Finland

Volume

2

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

1053

Abstract

In this paper a wideband CDMA single-carrier transmitter IF digital-to-analog converter (DAC) based on delta-sigma (ΔΣ) modulation is presented. The ΔΣ modulator is a 5-bit 12th order bandpass-type with a sampling frequency of 16 times the chip rate. The implementation consists of FIR interpolation filters, a ΔΣ modulator, a binary weighted D/A converter and an analog postfilter. This paper discusses mainly the digital ΔΣ architecture, and its performance on adjacent channel power ratio (ACPR) and error vector magnitude (EVM). Concerning on the given specifications, also linearity errors due to element mismatch distortion in the D/A conversion are discussed. The modulator is implemented in Xilinx. Virtex 400 series FPGA family

Keywords

FIR filters; band-pass filters; code division multiple access; delta-sigma modulation; field programmable gate arrays; hardware description languages; logic CAD; radio transmitters; 12th order bandpass-type; FIR interpolation filters; FPGA; IF digital-to-analog converter; Xilinx. Virtex 400; analog postfilter; binary weighted D/A converter; delta-sigma modulation; element mismatch distortion; error vector magnitude; linearity errors; wideband CDMA single-carrier transmitter; Delta modulation; Digital modulation; Digital-analog conversion; Finite impulse response filter; Frequency; Interpolation; Multiaccess communication; Sampling methods; Transmitters; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2001. ICECS 2001. The 8th IEEE International Conference on

Print_ISBN

0-7803-7057-0

Type

conf

DOI

10.1109/ICECS.2001.957668

Filename

957668