A digital modulator with bandpass delta-sigma modulator

Author

Sommarek, Johan ; Vankka, Jouko ; Ketola, Jaakko ; Lindeberg, Jonne ; Halonen, Kari

Author_Institution

Electron. Circuit Design Lab., Helsinki Univ. of Technol., Finland

fYear

2004

fDate

21-23 Sept. 2004

Firstpage

159

Lastpage

162

Abstract

A digital quadrature modulator with a bandpass ΔΣ-modulator is presented that interpolates orthogonal input carriers by 16 and performs a digital quadrature modulation at carrier frequencies f_s/4, -f_s/4, (f_s is the sampling frequency). After quadrature modulation, the signal is converted into an analogue IF signal using a bandpass ΔΣ modulator and a 1-bit D/A converter. The die area of the chip is 5.2 mm² (0.13 μm CMOS technology). The total power consumption is 139 mW at 1.5 V with a clock frequency of 700 MHz. (D/A converter full-scale output current 11.5 mA).

Keywords

CMOS integrated circuits; delta-sigma modulation; interpolation; modulators; signal sampling; 0.13 micron; 1.5 V; 11.5 mA; 139 mW; 700 MHz; CMOS; analogue IF signal; bandpass delta-sigma modulator; digital quadrature modulation; digital quadrature modulator; orthogonal input carrier interpolation; sampling frequency; single bit D/A converter; Baseband; Delta modulation; Digital modulation; Digital signal processing; Electronic circuits; Energy consumption; Filters; Radio frequency; Sampling methods; Tuning;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 2004. ESSCIRC 2004. Proceeding of the 30th European

Print_ISBN

0-7803-8480-6

Type

conf

DOI

10.1109/ESSCIR.2004.1356642

Filename

1356642