Title :
A 1.25mW 3rd-order Active-Gm-RC 250MHz-bandwidth analog filter based on power-stability optimization
Author :
De Matteis, M. ; D´Amico, S. ; Costantini, A. ; Pezzotta, A. ; Baschirotto, A.
Author_Institution :
Innovation Eng. Dept., Univ. of Salento, Lecce, Italy
Abstract :
In this paper a 250MHz-bandwidth continuous-time low-pass filter is presented. The filter is based on Active-Gm-RC biquadratic cell. With respect to Active-Gm-RC, this filter exploits an additional input RC-net, increasing the low-pass filtering order up to 3, while maintaining single-Opamp topology. In particular, Opamp frequency response has been optimized, exploiting a proper algorithm, that allows to minimize power and maximize loop gain phase margin. A prototype of the filter has been designed in CMOS 0.13μm technology, complying with ultra-wide-band receivers specifications. The filter consumes 1.2mW, while processing a 0.7Vzero-peak differential signal, and maintaining noise power spectral density under 237μVrms. The overall Signal-to-Noise-Ratio is 65dB.
Keywords :
CMOS analogue integrated circuits; biquadratic filters; continuous time filters; low-pass filters; operational amplifiers; optimisation; stability; 3rd-order Active-Gm-RC analog filter; CMOS technology; RC-net; active-Gm-RC biquadratic cell; bandwidth 250 MHz; continuous-time low-pass filter; differential signal; noise power spectral density; opamp frequency response; power 1.25 mW; power-stability optimization; signal-to-noise-ratio; single-Opamp topology; size 0.13 mum; ultra-wide-band receiver specifications; voltage 237 muV; Bandwidth; Frequency response; Linearity; Low pass filters; Power harmonic filters; Topology; Transfer functions; Active-Gm-RC; Analog filter; CMOS 0.13µm; Low-Power; Low-Voltage; Wireless; continuous-time;
Conference_Titel :
Electronics, Circuits and Systems (ICECS), 2012 19th IEEE International Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4673-1261-5
Electronic_ISBN :
978-1-4673-1259-2
DOI :
10.1109/ICECS.2012.6463751
