R. SENANI ET AL. 291

the advantages of independent tunability of BW or Qo

which is not feasible in the quoted circuit of [6] which

also needs two outputs to implement APF. Our FDCCII

has nine terminals in contrast to the FDCCII in [6] which

has eleven terminals to implement the biquad filter.

The comparison with [9] and [10] is now in order, The

circuit of [9] (Figure 8 there in) is also current-mode

MISO type and uses five grounded passive elements but

used two FDCCIIs (the first has ten terminals and the

other has nine terminals to implement the biquad filter)

and not independent tunability of BW or Qo.

The circuit of [10] although uses one FDCCII (eleven

terminals to implement the biquad filter in current –mode

and voltage mode) but has one floating resistance and

needs two outputs to implement LPF and APF.

5. Concluding Remarks

A method has been presented by which the FDCCII-

based CM SRCOs of [2] can be reconfigured as

MISO-type universal biquads offering realizations of all

the five standard filter functions also, thereby enhancing

their capabilities. One exemplary biquad resulting from

the application of the proposed method was presented

and its workability was demonstrated by SPICE simula-

tion using an FDCCII implementation in 0.35 μm CMOS

technology.

The methodology presented here could also be applied

to all other SRCOs published earlier using other kinds of

active building blocks thereby giving rise to a large

number of new MISO-type CM universal biquads, some

of which may possess some interesting features. This,

however, is left for further investigations.

6. Acknowledgements

The authors wish to thank an anonymous reviewer for his

constructive feedback, which has been helpful in im-

proving the presentation. The material presented here has

its origin in an earlier unpublished report2 of Analog Sig-

nal Processing Research Lab of NSIT, where part of this

work was performed.

7. References

[1] A. A. El-Adawy, A. M. Soliman and H. O. Elwan, “A

Novel Fully Differential Current Conveyor and Its Ap-

plications for Analog VLSI,” IEEE Transactions on Cir-

cuits and Systems II: Analog and Digital Signal Process-

ing, Vol. 47, No. 4, April 2000, pp. 306-313.

doi:10.1109/82.839666

[2] C. M. Chang, B. M. Al-Hashimi, H. P. Chen, S. H. Tu

and J. A. Wan, “Current Mode Single Resistance Con-

trolled Oscillators Using Only Grounded Passive Ele-

ments,” Electronics Letters, Vol. 38, No. 39, 2002, pp.

1071-1072. doi:10.1049/el:20020714

[3] H. P. Chen, “Single FDCCII-Based Universal Voltage-

Mode Filter,” International Journal of Electronics and

Commun (AEU), Vol. 63, No. 9, 2009, pp. 713-719.

doi:10.1016/j.aeue.2008.05.012

[4] F. Gür and F. Anday, “First-Order Allpass Sections-

Based High-Input Low-Output Impedance Voltage-Mode

Universal Filter Using FDCCIIs,” Proceeding of 18th

European Conference on Circuit Theory and Design,

Seville, 27-30 August 2007, pp. 428-431.

[5] C. M. Chang and H. P. Chen, “Single FDCCII-Based

Tunable Universal Voltage-Mode Filter,” Circuits Sys-

tems Signal Processing, Vol. 24, No. 2, 2005, pp. 221-

227. doi:10.1007/s00034-004-0422-7

[6] C. M. Chang, B. M. Al-Hashimi, C. L. Wang and C. W.

Hung, “Single Fully Differential Current Conveyor Bi-

quad Filters,” IEE Proceeding of Circuits Devices System,

Vol. 150, No. 5, 2003, pp. 394-398.

doi:10.1049/ip-cds:20030468

[7] S. A. Mahmoud, M. A. Hashiesh and A. M. Soliman,

“Low-Voltage Digitally Controlled Fully Differential

Current Conveyor,” IEEE Transactions on Circuits and

Systems I, Vol. 52, No. 10, 2005, pp. 2055-2064.

doi:10.1109/TCSI.2005.852922

[8] H. A. Alzaher, “CMOS Highly Linear Fully Differential

Current Conveyor,” Electronics Letters, Vol. 40, No. 4,

2004, pp. 214-216. doi:10.1049/el:20040183

[9] F. Gür and F. Anday, “Simulation a Novel Current-Mode

Universal Filter Using FDCCIIs,” Analog Integrated

Circuits and Signal Processing, Vol. 60, 2009, pp. 231-

236. doi:10.1007/s10470-009-9293-y

[10] C. N. Lee and C. M. Chang, “Single FDCCII-Based

Mixed-Mode Biquad Filter with Eight Outputs,” Interna-

tional Journal of Electronics and Communication (AEU),

Vol. 63, No. 9, 2009, pp. 736-742.

doi:10.1016/j.aeue.2008.06.015

[11] R. Senani and A. K. Singh, “A New Universal Current-

Mode Biquad Filter,” Frequenz, Vol. 56, 2002, pp. 55-59.

[12] R. Senani, A. K. Singh and V. K. Singh, “New Tunable

SIMO-Type Current-Mode Universal Biquad Using Only

Three MOCCs and All Grounded Passive Elements,”

Frequenz, Vol. 57, 2003, pp. 160-161.

[13] J. W. Horng, “Current Conveyor Based Current-Mode

Universal Biquadratic Filter,” Journal of the Chinese In-

stitute of Electrical Engineering, Vol. 9, 2002, pp. 147-

150.

[14] H. Y. Wang and C. T. Lee, “Versatile Insensitive Current

Mode Universal Biquad Implementation Using Current

Conveyors,” IEEE Transactions CAS-II. Analog and

Digital Signal Processing, Vol. 48, 2001, pp. 409-413.

2R. Senani, “Re-Configuring FDCCII-Based SRCOs into Universal

Current mode Biquads”, TCASII ID-2267, November 14, 2003 (Unpub-

lished).

[15] M. Siripruchyanun and W. Jaikla, “Cascadable Cur-

rent-Mode Biquad Filter and Quadrature Oscillator Using

C

opyright © 2011 SciRes. CS