A very compact KHN filter with multidecade tuning

Muñiz-Montero, Carlos; Díaz-Sánchez, A.; Carvajal, R.G.

doi:10.1109/ecctd.2007.4529532

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Another way to obtain very low-frequency filters is by biasing MOSFET transistors into the deep inversion region to obtain high-valued resistors [11] [12]. Also, the inherent voltage-to-current behavior shown by the MOS transistor was used to develop a current-mode filter scheme based on Kerwin Huelsman Newcomb (KHN) [13] and transmittance synthesis [14].…”

Section: Introductionmentioning

confidence: 99%

A Reconfigurable-Band Analog Filter Standard-Cell Based on Differential/Single Input Signaling

Diaz-Sanchez,

Zamora-Mejia,

Rocha-Perez

et al. 2024

IEEE Access

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This work presents a reconfigurable-band analog filter capable of performing the low-pass, high-pass, band-pass or all-pass functions. The proposed filter is a simple and compact cell composed of only two RC networks and one differential Operational Transconductance Amplifier (OTA). To select the desired filter type, two configurations must be done: 1) the two RC network shall be configured as lowpass/low-pass, high-pass/high-pass or low-pass/high-pass, 2) the input signals must be fed in differential or single mode. To validate theory and simulations, the proposed reconfigurable-band filter was designed, fabricated and measured to meet the biomedical band (0.1 Hz -10 kHz) in a 0.5 µm CMOS standard fabrication process. To achieve the extremely low RC time constants imposed by the biomedical band, the R element was implemented using PMOS high-value programmable resistor. The prototype exhibits a silicon area of 470 µm x 250 µm and a power consumption of 96.32 µW using a ± 0.8 V symmetric power supply. Due to this circuit's ability to perform four filter-functions, its operation band can be tuned over five decades, its power consumption is in the nano and micro-watt regime, and it is area compact, the proposed analog filter is a suitable candidate for being an analog standard-cell.INDEX TERMS CMOS, Continuous-time filter, Analog standar cell, Universal filter, Very-low frequency.

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Section: Introductionmentioning

confidence: 99%

A Reconfigurable-Band Analog Filter Standard-Cell Based on Differential/Single Input Signaling

Diaz-Sanchez,

Zamora-Mejia,

Rocha-Perez

et al. 2024

IEEE Access

Self Cite

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Procesamiento analógico a partir de elementos altamente resistivos

Muñiz-Montero

Sánchez-Gaspariano

Ponce-Ponce

et al. 2013

CyS

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This work proposes a technique for design of CMOS analog integrated circuits such as offset compensated amplifiers, low-frequency filters, programmable current mirrors and membership function generators, based on high-value (quasi-infinite) resistors. The proposed technique incorporates transistors operating in weak-inversion mode in order to reduce the area requirements and minimize the DCoffset. In addition, improvement on both, noise performance and linearity, are achieved along with an enhanced speed-accuracy-power tradeoff. Those features make easier the processing of low-frequency signals and allow the design of systems with multidecade tunability of gain and frequency. The presented circuits are attractive for implementation of highaccuracy processors for signal conditioning as well as architectures usually reserved to digital approaches, for instance neural networks, adaptive filters, and neurofuzzy systems, to mention a few. Characterization through computer simulations, statistical analysis and experimental measurements of prototypes in a doublepoly, three metal layers, 0.5μm CMOS technology are reported. The attained results follow the course anticipated in the design of the circuits.

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A very compact KHN filter with multidecade tuning

Abstract: Abstract-A very compact implementation of a multifunction

Cited by 2 publications

References 15 publications

A Reconfigurable-Band Analog Filter Standard-Cell Based on Differential/Single Input Signaling

A Reconfigurable-Band Analog Filter Standard-Cell Based on Differential/Single Input Signaling

Procesamiento analógico a partir de elementos altamente resistivos

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