High input impedance current controlled voltage-mode universal filter using DDCC and OTA

Udorn, Nawee; Duangmalai, Danupat; Noppakarn, Aekkarat

doi:10.1109/icves.2011.5983779

Cited by 1 publication

(1 citation statement)

References 15 publications

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“…Several SIMO second order voltage mode universal filters using different analog active function blocks have been published in the literature . However, these reposed filters have some inconveniences as it has been observed that the active building blocks are not implemented from the commercially available IC [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][36][37][38][39][40][41][42][43]; all capacitors are not grounded [14,18,29,42], the natural frequency is not electronically tuned 36], absence of orthogonal tune of the 0 and Q [13-16, 18-24, 29, 30, 35, 36, 40, 41, 43, 46, 47], the passband voltage gain is not constant during tuning the natural frequency and quality factor [14, 17, 18, 20, 25, 26, 28, 29, 32-34, 36, 38, 39, 42].…”

Section: Introductionmentioning

confidence: 99%

One input voltage and three output voltage universal biquad filters with orthogonal tune of frequency and bandwidth

Wai

Chaichana

Jaikla

et al. 2021

IJECE

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This research paper contributes the one input three output voltage mode universal biquad filters with linear and electronic control of the natural frequency (w0), using two commercially available ICs, LT1228s as active device with two grounded capacitors, five resistors. The presented universal biquad filters can simultaneously provide three voltage-mode filtering functions, low-pass (LP), high-pass (HP) and band-pass (BP) without changing the circuit architecture. Furthermore, the first presented biquad filter provides low impedance at HP, BP voltage output nodes and LP, BP output voltage nodes are low impedance for the second proposed filter which is easy cascade ability with other voltage mode circuits without the employment of buffer circuits. The quality factor (Q) of both proposed filters is orthogonally adjusted from the passband voltage gain and w0. The proposed filters are simulated and experimented with commercially accessible ICs, LT1228. The simulated and experimental results demonstrate the filtering performances.

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