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In this paper we report the on-chip automatic tuning of digitally programmable continuous-time G<sub>m</sub>-C filters with a wide operation range employing a hybrid analog/fine-digital/coarse master-slave scheme. The tuning method, for both Q-factor and the characteristic frequency, is based on a digital phase comparator included in the phase-locked loop(More)
In this paper a new auto-tuning digital technique is reported for continuous-time filters over VHF applications, based on phase detector. By using a 0.35 μm digital CMOS process, changes in frequency response of a 3thr-order low pass filter can be tuned with a 3.1% error over the designed value. This technique confirms the feasibility of the proposed scheme(More)
This work presents two current-mode integrated circuits designed for sensor signal preprocessing in embedded systems. The proposed circuits have been designed to provide good signal transfer and fulfill their function, while minimizing the load effects due to building complex conditioning architectures. The processing architecture based on the proposed(More)
In this paper we report 3/sup rd/-order G/sub m/-C filters based on fully-balanced pseudo-differential continuous-time transconductors for applications in low-voltage systems over VHF range. By using a 0.35 /spl mu/m standard CMOS process, two low-pass filter approximations (Butterworth and Elliptic) have been implemented with a cut-off frequency(More)
In this paper we report 2 and 3-order Gm-C filters based on fully-balanced pseudo-differential continuoustime transconductors for applications in low-voltage systems over the VHF range. By using a 0.35 μm standard CMOS process, low-pass filter approximations have been implemented with a cut-off frequency programmability over the 40-200 MHz range, which(More)