Title :
The Path to the Software-Defined Radio Receiver
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA
fDate :
5/1/2007 12:00:00 AM
Abstract :
After being the subject of speculation for many years, a software-defined radio receiver concept has emerged that is suitable for mobile handsets. A key step forward is the realization that in mobile handsets, it is enough to receive one channel with any bandwidth, situated in any band. Thus, the front-end can be tuned electronically. Taking a cue from a digital front-end, the receiver´s flexible analog baseband samples the channel of interest at zero IF, and is followed by clock-programmable downsampling with embedded filtering. This gives a tunable selectivity that exceeds that of an RF prefilter, and a conversion rate that is low enough for A/D conversion at only milliwatts. The front-end consists of a wideband low noise amplifier and a mixer tunable by a wideband LO. A 90-nm CMOS prototype tunes 200 kHz to 20-MHz-wide channels located anywhere from 800 MHz to 6 GHz
Keywords :
CMOS analogue integrated circuits; FIR filters; UHF mixers; UHF oscillators; low noise amplifiers; mobile handsets; radio receivers; software radio; wideband amplifiers; 0.2 to 20 MHz; 0.8 to 6 GHz; 90 nm; A/D conversion; CMOS prototype; RF prefilter; analog FIR filter; analog baseband samples; analog decimator; anti-aliasing; bandpass signal processing; boxcar integrator; clock-programmable downsampling; cognitive radio; digital front-end; direct conversion receiver; embedded filtering; mixer; mobile handsets; multimode receiver; multirate signal processing; receiver dynamic range; software-defined radio receiver; switched capacitor circuit; wide tuning local oscillator; wideband local oscillator; wideband low noise amplifier; wideband receiver; wideband sampling; Bandwidth; Baseband; Broadband amplifiers; Clocks; Digital filters; Filtering; Low-noise amplifiers; Mobile handsets; Radio frequency; Receivers; Analog decimator; Software Defined Radio (SDR); analog FIR filter; anti-aliasing; bandpass signal processing; boxcar integrator; cognitive radio; decimation; digital AGC; direct conversion receiver; multi-mode receiver; multi-rate signal processing; receiver dynamic range; sampling; switched capacitor circuit; wide tuning local oscillator; wideband receiver; wideband sampling; zero IF;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2007.894307
