Title :
On the use of Nauta´s transconductor in low-frequency CMOS gm -C bandpass filters
Author :
Andreani, Pietro ; Mattisson, Sven
Author_Institution :
Dept. of Electroscience, Lund Univ., Sweden
fDate :
2/1/2002 12:00:00 AM
Abstract :
This paper discusses the use of a transconductor, first proposed by Nauta for high frequency applications, in low frequency CMOS gm -C bandpass filters. The behavior of the transconductor is examined in detail, showing that the robust implementation of higher-order low-voltage filters is possible for center frequencies in the lower megahertz region. The experimental results are presented of the realization of two prototypes, a 0.6-μm CMOS 18th-order real bandpass filter and a 0.35-μm CMOS 7th-order complex (14th-order bandpass) filter, both with a center frequency of 3 MHz and a passband of 1 MHz. These filters comply with the specifications for the channel-select stage of the Bluetooth short-range radio receiver
Keywords :
CMOS analogue integrated circuits; Q-factor; band-pass filters; continuous time filters; radio receivers; transfer functions; 18th-order real bandpass filter; 3 MHz; 7th-order complex filter; Bluetooth short-range radio receiver; LF CMOS bandpass filters; analog CMOS design; channel-select stage; continuous-time filters; differential architecture; dynamic range; higher-order low-voltage filters; nonquasi-static MOS models; polyphase filters; quality factor; robust implementation; transconductor; transfer functions; transistor simulation model; Band pass filters; Bluetooth; Frequency; Inverters; MOSFETs; Matched filters; Prototypes; Receivers; Robustness; Transconductors;
Journal_Title :
Solid-State Circuits, IEEE Journal of
