New universal biquad filters using only two unity-gain cells

Weng, Ro-Min; Lai, Jiunn-Ru; Lee, Maw-Huei

doi:10.1080/002072100132444

Cited by 21 publications

(14 citation statements)

References 7 publications

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“…(i) non-availability of explicit current output (Clema et al 1995, Weng and Lee 1997, Weng et al 2000 and/or non-availability of explicit voltage output (Weng et al 2000); (ii) non-employment of both grounded capacitors (GC) Lee 1997, Weng et al 2000); (iii) complex nature of input impedance (Abuelma'atti and Al-Qahtani 1996, Weng and Lee 1997, Weng et al 2000, Chang et al 2001 (iv) necessity of changing or altering connections of some elements for realizing some of the needed filter functions (Celma et al 1995. Senani andGupta 1997); (v) need of reversal of input signal for realizing some of the filter functions (Abuelma'atti and Al-Qahtani 1996, Weng and Lee 1997, Weng et al 2000, Chang et al 2001.…”

Section: Introductionmentioning

confidence: 99%

“…voltage follower and current follower) in analog signal processing and circuit design is attributed to the relatively wider bandwidth, lower power consumption and simpler architectures of these elements compared to other more complex building blocks. Motivated by these factors, there has been considerable interest in realizing universal filters (Celma et al 1995, Abuelma'atti and Al-Qahtani 1996, Senani and Gupta 1997, Weng and Lee 1997, Alzaher and Ismail 1999, Weng et al 2000, Chang et al 2001, Senani and Singh 2002 using unity-gain cells (UGC). However, previously reported UGC-based universal filters suffer from one or more of the following drawbacks:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

New voltage-model/current-mode universal biquad filter using unity-gain cells

Gupta

Senani²

2006

International Journal of Electronics

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A new universal biquad filter is presented which can realize all the five standard filter functions namely lowpass, bandpass, highpass, notch and allpass in voltage-mode (VM) as well as in current-mode (CM) employing only unity-gain cells (i.e. voltage followers and current followers) as active elements. Explicit VM/CM outputs are available from low output impedance terminals and high output impedance terminals, respectively. The workability of the proposed universal biquad, realized with CMOS unity-gain cells, is established by SPICE simulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New voltage-model/current-mode universal biquad filter using unity-gain cells

Gupta

Senani²

2006

International Journal of Electronics

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“…Recently, design of current and voltage-mode filters based on current followers and/or voltage buffers (VBs) such as [6][7][8][9][10] has been of growing interest due to their inherent large bandwidth, high linearity, and low power consumption. However, there are two major limitations associated with this approach, which hinder its use in analog integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

A CMOS digitally programmable filter technique for VLSI applications

Alzaher

2008

Analog Integr Circ Sig Process

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A novel technique for designing analog CMOS integrated filters is proposed. The technique uses digitally controlled current amplifiers (DCCAs) to provide precise frequency and/or gain characteristics that can be digitally tuned over a wide range. This paper provides an overview of the possibilities of using the DCCA as the core element in programmable filters. In mixed analog/digital systems, the digital tuning feature of the proposed approach allows direct interfacing with the digital signal processing (DSP) part. Basic building blocks such as digitally programmable amplifiers, integrators, and simulated active inductors are given. Systematic designs of second-order filters are presented. Fully differential architectures of the proposed circuits are developed. Experimental results obtained from 0.5 lm standard CMOS chips are provided.

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“…Motivated by these advantages, the use of followers has been explored mainly in the realisation of filters [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], oscillators [21][22][23][24][25][26][27][28] and more recently, in impedance converters [28].…”

Section: Introductionmentioning

confidence: 99%

New Single-Resistance-Controlled Oscillator Configurations Using Unity-Gain Cells

Gupta

Senani

2005

Analog Integr Circ Sig Process

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Unity-gain voltage followers and unity-gain current followers have attracted attention in the recent literature in the context of analog signal processing as well as signal generation because of the advantages of wider bandwidth and low power consumption of these active elements as compared to other more complex building blocks. Motivated by these advantages, followers have been used as alternatives to other more complex building blocks in the realisation of filters, oscillators and more recently, in impedance converters. Although some configurations for realizing sinusoidal oscillators using unity-gain voltage/current followers have been described in the earlier literature, only one of them is a second-order single-resistance-controlled oscillator but requires as many as eight followers. This paper derives, through a state-variable synthesis approach, a number of new follower-based single-resistancecontrolled oscillators requiring a much smaller number (only two to four) of followers. The new circuits are shown to possess a number of other interesting features. The workability of the new structures has been confirmed by SPICE simulation results using CMOS-based followers.

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New universal biquad filters using only two unity-gain cells

Cited by 21 publications

References 7 publications

New voltage-model/current-mode universal biquad filter using unity-gain cells

New voltage-model/current-mode universal biquad filter using unity-gain cells

A CMOS digitally programmable filter technique for VLSI applications

New Single-Resistance-Controlled Oscillator Configurations Using Unity-Gain Cells

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