Title :
A quadrature direct digital downconverter
Author :
Vancorenland, Peter ; Coppejans, Philippe ; De Cock, Wouter ; Steyaert, Michiel
Author_Institution :
ESAT-MICAS, Katholieke Univ., Leuven, Belgium
Abstract :
A quadrature direct digital down converter (DDD) is presented. The converter has a continuous time ΔΣ noise shaping loopfilter with a quadrature bandpass characteristic. Through the integration of mixers in the AD converter, RF input signals in the range 0.3-1.6 GHz can be downconverted to a digital I and Q output stream at a bit rate of 128 MHz. The circuit is designed as a front-end for low power receivers with a 2 MHz wide IF bandwidth centered around 4 MHz. The converter, integrated in a 0.25 μm CMOS technology, consumes 14 mW from a 2 V supply.
Keywords :
CMOS integrated circuits; UHF frequency convertors; UHF integrated circuits; UHF mixers; analogue-digital conversion; baluns; continuous time filters; low-power electronics; mixed analogue-digital integrated circuits; radio receivers; 0.25 micron; 0.3 to 1.6 GHz; 128 MHz; 14 mW; 2 MHz; 2 V; AD converter; CMOS technology; IF bandwidth; RF input signals; continuous time ΔΣ noise shaping loopfilter; digital I output stream; digital Q output stream; integrated balun; low power CMFB circuits; low power receiver front-end; mixer integration; quadrature bandpass characteristic; quadrature direct digital downconverter; Band pass filters; Bandwidth; Bit rate; CMOS technology; Computed tomography; Feedforward systems; Noise shaping; RF signals; Radio frequency; Stability;
Conference_Titel :
Custom Integrated Circuits Conference, 2002. Proceedings of the IEEE 2002
Print_ISBN :
0-7803-7250-6
DOI :
10.1109/CICC.2002.1012803
