Title :
4th-Order 84dB-DR CMOS-90nm low-pass filter for WLAN receivers
Author :
De Matteis, M. ; Pezzotta, A. ; Baschirotto, A.
Author_Institution :
Innovation Eng. Dept., Univ. of Salento, Lecce, Italy
Abstract :
In this paper a 11MHz-f@-3dB continuous-time analog filter is presented. A low-noise circuital topology has been used based on typical Active-RC cells, like opamp-based integrators, and Active-Gm-RC biquadratic cell. The basic idea is to synthesize two complex poles pairs (4th-Order Filter) using a single compact Active RC cell, which minimizes the in-band noise power contributions. A filter prototype, complying with WLAN baseband requirements, has been designed in CMOS 90nm technology. Thanks to noise power spectral density reduction - 48μVrms output integrated noise (100kHz÷11MHz) at 0dB-pass-band gain - wide Dynamic Range (84dB@THD>;40dBc) is performed. In-band IIP3 is 10dBm, while the filter power consumption is 14mW.
Keywords :
CMOS analogue integrated circuits; biquadratic filters; continuous time filters; integrated circuit design; low-pass filters; network topology; operational amplifiers; radio receivers; wireless LAN; 4th-order DR CMOS low pass filter prototype; CMOS technology; WLAN baseband requirement; WLAN receiver; continuous-time analog filter; filter power consumption; in-band noise power contribution; low noise circuital topology; noise power spectral density reduction; opamp-based integrator; output integrated noise; single compact active-Gm-RC biquadratic cell; size 90 nm; CMOS integrated circuits; Low pass filters; Noise; Receivers; Transfer functions; Wireless LAN; Active RC; Analog filter; CMOS 90nm; Low-Power; Low-Voltage; Wireless;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937895
