Multiple-Mode OTA-C Universal Biquad Filters

Two new multiple-mode (including voltage, current, transconductance, and transresistance modes) OTA-C universal biquad filters are proposed. The first proposed circuit uses only four operational transconductance amplifiers (OTAs) and two grounded capacitors. The second proposed circuit uses five OTAs and two grounded capacitors. Both the proposed circuits can realize voltage, current, transconductance, and transresistance mode universal filtering responses (low-pass, high-pass, band-pass, notch, and all-pass) from the same topology. The first proposed circuit uses the least number of components. This represents an attractive feature from a chip area and power consumption point of view. The second proposed circuit has no need of extra inverting and non-inverting amplifiers for special input signals. Moreover, both the proposed biquads still have (i) the employment of two grounded capacitors, (ii) cascadable connection of the former voltage-mode stage and the latter current-mode stage, and (iii) low sensitivity performance. H-SPICE simulation results confirm the theoretical analysis.

[1]  Sajal K. Paul,et al.  A new mixed mode biquad using reduced number of active and passive elements , 2006, IEICE Electron. Express.

[2]  Muhammad Taher Abuelma'atti,et al.  A Novel Mixed-Mode Current-Controlled Current-Conveyor-Based Filter , 2003 .

[3]  Muhammad Taher Abuelma'atti *,et al.  A novel mixed-mode OTA-C universal filter , 2005 .

[4]  Muhammad Taher Abuelma'atti,et al.  A novel mixed-mode current-conveyor-based filter , 2004 .

[5]  Mohmad Amin Malik,et al.  Multifunction mixed-mode filter using FTFNs , 2006 .

[6]  Hakan Kuntman,et al.  High-output-impedance transadmittance type continuous-time multifunction filter with minimum active elements , 2001 .

[7]  Montree Siripruchyanun,et al.  ResearchArticle Three-Input Single-Output Electronically Controllable Dual-Mode Universal Biquad Filter Using DO-CCCIIs , 2007 .

[8]  Hassan Elwan,et al.  A novel fully differential current conveyor and applications for analog VLSI , 2000 .

[9]  Muhammad Taher Abuelma'atti,et al.  A Novel Mixed-Mode CCII-Based Filter , 2004 .

[10]  R. K. Sharma,et al.  New Dual-mode Biquads Using OTAs , 2006 .

[11]  A. K. Singh,et al.  Novel mixed-mode universal biquad configuration , 2005, IEICE Electron. Express.

[12]  J. K. Fidler,et al.  Synthesis and performance analysis of universal minimum component integrator-based IFLF OTA-grounded capacitor filter , 1996 .

[13]  Ahmed M. Soliman.  Mixed-mode biquad circuits , 1996 .

[14]  Chun-Ming Chang,et al.  High-order DDCC-based general mixed-mode universal filter , 2006 .

[15]  Rolf Schaumann,et al.  Highly linear voltage-controlled CMOS transconductors , 1993 .

[16]  Abdhesh K. Singh,et al.  New OTA-C universal current-mode/trans-admittance biquads , 2005, IEICE Electron. Express.