Design Techniques to Increase Performance of Switched-Capacitor Filters

Serra, Hugo; Santos-Tavares, Rui; Paulino, Nuno

doi:10.1007/978-3-031-04184-6_3

Cited by 1 publication

(1 citation statement)

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“…Moreover, due to large-sized components the passive resistor-inductor-capacitor (RLC) or active resistorcapacitor (RC) filter topologies are undesirable for low-cut-off frequencies in integrated circuits [13]. In addition, as switched-capacitor filters [14] have the deficiency of clock feed-through and leakage in complex processes, they are also merely employed in filter circuit design. On the other hand, the circuits that have been frequently utilized in biomedical systems to achieve lowcut-off frequency levels are gm-C filters which are used in wide range of industrial applications such as channel selection filters, channel digital video receivers, reading and writing computer hard disks, mobile phone wireless receivers, and low frequency applications such as biomedical engineering.…”

Section: Introductionmentioning

confidence: 99%

A Highly Tunable Ultra-Low Cut-Off Frequency gm-c Filter with Bandwidth Stabilization Technique

Sasan,

Baghtash

2023

Preprint

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In this paper, an efficient technique for stabilizing the bandwidth of low-bandwidth biomedical gm-c filters is proposed. Using this technique, the bandwidth of the filter becomes much less dependent on the circuit elements’ variations due to temperature or process, and thus the filter can be tuned more effectively and accurately. First, with circuit analysis, the reason for the dependency of the bandwidth on the circuit components is extracted. Then, an efficient circuit is proposed to reduce this dependency. The proposed 4th order gm-c filter has a symmetrical structure, and designed in TSMC 180 nm CMOS technology with bandwidth of 50 mHZ to 20 Hz, power consumption of 0.73 µW. Finally, using mathematical relationships and circuit simulations, the effectiveness of the proposed filter is proven.

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Section: Introductionmentioning

confidence: 99%