A Fully Integrated Single-Ended 1.5–15-Hz Low-Pass Filter With Linear Tuning Law

Bruschi, P.; Nizza, N.; Pieri, Francesco; Schipani, M.; Cardisciani, Danilo

doi:10.1109/jssc.2007.899081

Cited by 26 publications

(14 citation statements)

References 21 publications

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“…Comparing with the prior works [1,2,7] in Table 1, the proposed solution attains tunable and ultra-low cutoffs with small power and output noise due to the techniques of frequency-translation and a more reasonable transconductance value based on the Nauta cell OTA. On the other hand, the stopband attenuation in this work is fixed to 40 dB/decade without involving a resonant zero to limit the attenuation at high frequency as in [1].…”

Section: Simulation Resultsmentioning

confidence: 88%

“…On the other hand, the stopband attenuation in this work is fixed to 40 dB/decade without involving a resonant zero to limit the attenuation at high frequency as in [1]. Nevertheless, this work still shows less dynamic range than [1] due to the existence of chopper spikes. The dynamic range can be improved by adding a spike filter after the LPF [6].…”

Section: Simulation Resultsmentioning

confidence: 95%

“…Among such a low frequency range, an ultralow-cutoff LPF cannot be designed in a simple manner as the fabrication cost of the chip will be increased when large time constants are required for integrated circuit implementation. The state-of-the-art [1][2][3] reduces the silicon area by applying different circuit structures for achieving an ultra-low transconductance. Yet, lowering the transconductance leads to substantial noise degradation.…”

Section: Introductionmentioning

confidence: 99%

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A frequency-translation technique for low-noise ultra-low-cutoff lowpass filtering

Mak

Martins

2012

Analog Integr Circ Sig Process

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Presented is a frequency-translation technique for compact realization of a low-noise lowpass filter (LPF) for biopotential acquisition systems. It is by chopper-stabilizing a bandpass filter (BPF) to obtain an ultra-lowcutoff lowpass response. This technique not only removes the BPF's flicker noise and dc-offset, but also adds clockbased gain-bandwidth tunability and saves chip area because of highly relaxed time constants. A 1.4 to 15-Hz 2nd-order OTA-C ladder LPF designed in a 90-nm CMOS process verifies the merits of the technique with respect to the prior art.

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Section: Simulation Resultsmentioning

confidence: 88%

Section: Simulation Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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A frequency-translation technique for low-noise ultra-low-cutoff lowpass filtering

Mak

Martins

2012

Analog Integr Circ Sig Process

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“…6 is employed for two reasons; 1) a differential structure widens the signal swing and 2) unity gain feedback maintains good linearity in the pass-band [10] [11]. Targeting a frequency range up to 100 Hz, a total on chip capacitor of 78 pF can be used (C 1 = 2C 2 = 52 pF) and the entire filter circuit is fully integratable.…”

Section: A Butterworth 2 Nd -Order Lpfmentioning

confidence: 99%

A modular transconductance reduction technique for very low-frequency G<inf>m</inf>-C filters

Sawigun

Serdijn

2012

2012 IEEE International Symposium on Circuits and Systems

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This paper presents a modular technique for transconductance reduction of a sub-threshold transconductor. This technique employs an ordinary differential pair circuit as a module to build a linear attenuator and to be the main transconductor. By applying the linear attenuation, the input linear range expansion and transconductance reduction are simultaneously achieved by sacrificing around 33% of its dynamic range compared to the ordinary differential pair transconductor. A 2 nd -order G m -C low-pass as an application of the proposed transconductor has been designed and simulated using 0.18-µm AMS technology. Compared to existing designs, post-layout simulation results show that, with a smaller active area (including bias circuitry, transconductors and capacitors), this design provides greater dynamic range, wider tuning range and lower power consumption.

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“…[10] used this technique to achieve a 500 mHz cut-off low pass filter. Alternatively, [8], [11] made use of transistors in the triode region to perform the voltage-to-current conversion.…”

Section: Introductionmentioning

confidence: 99%

A Subhertz Nanopower Low-Pass Filter

Rodriguez‐Villegas

Casson

Corbishley

2011

IEEE Trans. Circuits Syst. II

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Abstract-This brief presents a first order low pass filter topology capable of providing cut-off frequencies down to 2 mHz with a power consumption of 5 nW. The circuit is intended for signal conditioning applications, particularly for use with very low frequency physiological signals in low power portable medical equipment. To achieve the low frequency cut-off the filter is based around the use of a clocked transconductor which provides a low transconductance while using a relatively high bias current level. The circuit is implemented in a 0.35 µm technology with a 1 V supply and has a measured 32 µV RMS of noise and 64 dB dynamic range. In terms of power consumption and cut-off frequency the reported filter outperforms previous filters from the literature.

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A Fully Integrated Single-Ended 1.5–15-Hz Low-Pass Filter With Linear Tuning Law

Cited by 26 publications

References 21 publications

A frequency-translation technique for low-noise ultra-low-cutoff lowpass filtering

A frequency-translation technique for low-noise ultra-low-cutoff lowpass filtering

A modular transconductance reduction technique for very low-frequency G<inf>m</inf>-C filters

A Subhertz Nanopower Low-Pass Filter

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