Title :
A Widely-Tunable, Reconfigurable CMOS Analog Baseband IC for Software-Defined Radio
Author :
Kitsunezuka, Masaki ; Hori, Shinichi ; Maeda, Tadashi
Author_Institution :
Device Platforms Res. Labs., NEC Corp., Kawasaki, Japan
Abstract :
This paper describes a reconfigurable analog baseband (ABB) for a software-defined radio (SDR). A wide variety of filter characteristics needed for SDR can be obtained by a reconfigurable filter based on a newly developed duty-cycle controlled discrete-time transconductor. The ABB, implemented in a 90 nm CMOS process, provides second- and fourth-order Butterworth, Chebyshev, and elliptic responses with bandwidths from 400 kHz to 30 MHz. The chip draws only 12 mA and achieves a P1dB of +7 dBm with a 1.0 V supply. The input-referred integrated in-band noise is 0.31 mVrms and the die area is as small as 0.57 mm2.
Keywords :
Butterworth filters; CMOS analogue integrated circuits; Chebyshev filters; VHF filters; circuit tuning; discrete time filters; elliptic filters; software radio; ABB implementation; Chebyshev filter; SDR; bandwidth 400 kHz to 30 MHz; current 12 mA; duty-cycle controlled discrete-time transconductor; elliptic filter response; fourth-order Butterworth filter; integrated in-band noise; reconfigurable CMOS analog baseband IC; second-order Butterworth filter; size 90 nm; software-defined radio; voltage 1.0 V; widely-tunable reconfigurable filter; Analog integrated circuits; Bandwidth; Baseband; CMOS analog integrated circuits; CMOS integrated circuits; Energy consumption; Filters; Radio control; Transconductors; Wireless sensor networks; Analog baseband; discrete-time filter; duty-cycle control; reconfigurable filter; software-defined radio;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2009.2023275
