The design of an Active-G(m)-RC biquad low-pass cell is presented. The cell combines the advantage of G.-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). As a prototype design, a second order low-pass filter with a pole frequency of 10 MHz and a unitary Q factor has been designed in a 0.18 mum CMOS technology with a 1.8 V supply voltage. The cell shows an IIP3 of 30 dBm at 1 MHz and an input referred noise of 30 nVrootHz while the power consumption is limited to 1.5 mW only. The filter 3(rd) parasitic pole is at 500 MHz. A digital tuning scheme with a 1.5% accuracy has been adopted
D'Amico, S., Baschirotto, A. (2003). An active-Gm-RC continuous-time biquad low-pass cell. In Electronics, Circuits and Systems, 2003. ICECS 2003. Proceedings of the 2003 10th IEEE International Conference on (pp.551-554). IEEE [10.1109/ICECS.2003.1301844].
An active-Gm-RC continuous-time biquad low-pass cell
BASCHIROTTO, ANDREA
2003
Abstract
The design of an Active-G(m)-RC biquad low-pass cell is presented. The cell combines the advantage of G.-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). As a prototype design, a second order low-pass filter with a pole frequency of 10 MHz and a unitary Q factor has been designed in a 0.18 mum CMOS technology with a 1.8 V supply voltage. The cell shows an IIP3 of 30 dBm at 1 MHz and an input referred noise of 30 nVrootHz while the power consumption is limited to 1.5 mW only. The filter 3(rd) parasitic pole is at 500 MHz. A digital tuning scheme with a 1.5% accuracy has been adopted
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