Continuos-Time filters are widely used in signal processing but require a tuning system to align ... more Continuos-Time filters are widely used in signal processing but require a tuning system to align their frequency response. Several tuning techniques have been proposed in the literature, which can be grouped in two basic schemes: master-slave and self-calibrationarrangements. Here we propose a novel tuning approach which can be applied to both tuning schemes. The tuning algorithm is based on the application of a pseudo-random input Test Pattern Signal and on the evaluation of a few samples of the input-output cross-correlation function. The key advantages of the proposed technique are basically the use of a pseudo-random pattern signal which can be generated by a very simple circuit in a small diearea and the simple circuitry required to sample the filter output and to perform the cross-correlation operation.Some experimental results of the application of the proposed tuning technique to a benchmark filter are given in order to assess its effectiveness.
A 0.55 V supply voltage fourth-order low-pass continuous-time filter is presented. The low-voltag... more A 0.55 V supply voltage fourth-order low-pass continuous-time filter is presented. The low-voltage operating point is achieved by an improved bias circuit that uses different opamp input and output common-mode voltages. The fourth-order filter architecture is composed by two active- Gm-RC biquadratic cells, which use a single opamp per-cell with a unity-gain-bandwidth comparable to the filter cut-off frequency. The -
Analog Integrated Circuits and Signal Processing, 2005
An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advanta... more An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advantage of GM-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). Two additional digital-based circuits allow to control the pole frequency and to reduce the effects of the non-dominant poles. A 4th order low-pass Butterworth filter with a 2.11 MHz cut-off frequency
Analog Integrated Circuits and Signal Processing, 2006
Analog Integrated Circuits and Signal Processing, 46, 6572, 2006 cс 2005 Springer Science + Busi... more Analog Integrated Circuits and Signal Processing, 46, 6572, 2006 cс 2005 Springer Science + Business Media, Inc. Manufactured in The Netherlands. ... A Low-Power Reconfigurable Analog Filter for UMTS/WLAN Receivers ... STEFANO D'AMICO, VITO GIANNINI AND ANDREA ...
Continuos-Time filters are widely used in signal processing but require a tuning system to align ... more Continuos-Time filters are widely used in signal processing but require a tuning system to align their frequency response. Several tuning techniques have been proposed in the literature, which can be grouped in two basic schemes: master-slave and self-calibrationarrangements. Here we propose a novel tuning approach which can be applied to both tuning schemes. The tuning algorithm is based on the application of a pseudo-random input Test Pattern Signal and on the evaluation of a few samples of the input-output cross-correlation function. The key advantages of the proposed technique are basically the use of a pseudo-random pattern signal which can be generated by a very simple circuit in a small diearea and the simple circuitry required to sample the filter output and to perform the cross-correlation operation.Some experimental results of the application of the proposed tuning technique to a benchmark filter are given in order to assess its effectiveness.
A 0.55 V supply voltage fourth-order low-pass continuous-time filter is presented. The low-voltag... more A 0.55 V supply voltage fourth-order low-pass continuous-time filter is presented. The low-voltage operating point is achieved by an improved bias circuit that uses different opamp input and output common-mode voltages. The fourth-order filter architecture is composed by two active- Gm-RC biquadratic cells, which use a single opamp per-cell with a unity-gain-bandwidth comparable to the filter cut-off frequency. The -
Analog Integrated Circuits and Signal Processing, 2005
An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advanta... more An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advantage of GM-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). Two additional digital-based circuits allow to control the pole frequency and to reduce the effects of the non-dominant poles. A 4th order low-pass Butterworth filter with a 2.11 MHz cut-off frequency
Analog Integrated Circuits and Signal Processing, 2006
Analog Integrated Circuits and Signal Processing, 46, 6572, 2006 cс 2005 Springer Science + Busi... more Analog Integrated Circuits and Signal Processing, 46, 6572, 2006 cс 2005 Springer Science + Business Media, Inc. Manufactured in The Netherlands. ... A Low-Power Reconfigurable Analog Filter for UMTS/WLAN Receivers ... STEFANO D'AMICO, VITO GIANNINI AND ANDREA ...
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