Signal flow graph realization of n&lt;sup&gt;th&lt;/sup&gt;-order current-mode allpass filters using CFTAs

Intawichai, Kritsakon; Tangsrirat, Worapong

doi:10.1109/ecticon.2013.6559519

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…(1) The large number of active devices (3n + 2 ECCIIs in [11], n + 1 CCCIIs [13], 2n + 2 CCIIs in [14], n + 1 CFTAs in [15]); (2) The large number of passive devices (3n + 3 resistances and n capacitors in [11], n capacitors and n resistors in [12], 2n + 2 resistors and n capacitors in [14]. ); (3) The large number of inputs (n + 1 input terminals in [10,12,14]) or output terminals (3 outputs in [13]);…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the voltage-mode circuits, current-mode circuits have advantageous in terms of bandwidth, dynamic range, linearity, and power consumption [7][8][9]. Many of current-mode nth-order filter circuits reported in [10][11][12][13][14][15] exhibit good performances, but unfortunately, those reported structures suffer from one or more of the following weaknesses:…”

Section: Introductionmentioning

confidence: 99%

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Resistorless Reconfigurable nth-Order Filter Based on DPCDTA for Multi-mode Filtering Applications

2015

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This paper presents a new topology for realizing current-mode reconfigurable nth-order filter for multi-mode wireless communication equipments, which is based on a new active device, namely digitally programmable current differencing transconductance amplifier (DPCDTA). The proposed filter is resistorless, and it employs n DPCDTAs and n grounded capacitors with one input and one output terminals. The signal path of the filter does not contain any switches, and wide tuning coefficient of the filter is implemented using programmable current division network with zero standby power consumption in the DPCDTA. Also, the proposed topology exhibits broader programmable features to accommodate wide range of selectivity requirements, which can be used as the most compatible structure for fieldprogrammable analog array and very suitable for multi-mode filtering applications. The programming ability of variable filter orders from first to fourth providing low-pass, highpass, and band-pass responses, and programming ability of variable cutoff frequencies from 1.14 to 11.75 MHz are given as application examples. The performance of the circuits have been verified and evaluated through post-layout simulations using Cadence IC5141 with GlobalFoundries'0.18 μm CMOS process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Resistorless Reconfigurable nth-Order Filter Based on DPCDTA for Multi-mode Filtering Applications

2015

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“…Compared with CDTA, the number of transistor used for CFTA is lesser. Therefore, several CFTA-based analog signal processing circuits are reported [14][15][16][17][18][19]. The CFTA has been already used to realize QOs [20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%