An Electronically Controllable Capacitance Multiplier with Temperature Compensation

This article introduces a capacitance multiplier employing operational transconductance amplifiers (OTAs). The provided capacitor is a floating element synthesized from a grounded capacitor. Its outstanding feature is that the capacitive value can be widely adjusted by input bias currents of the OTAs and is temperature-insensitive. The circuit construction comprises only four OTAs, three of them are single-output OTAs which are commercially available while one of them is a dual-output OTA, cooperating with a grounded capacitor. The circuit performances are depicted through PSPICE simulations, they show good agreement to theoretical anticipation. An application as a fifth-order Chebyshev high-pass filter is included to confirm the usability of proposed circuit

[1]  M. T. Ahmed,et al.  Realisation of tunable floating resistors , 1986 .

[2]  Jiun-Wei Horng.  Current conveyors based allpass filters and quadrature oscillators employing grounded capacitors and resistors , 2005, Comput. Electr. Eng..

[3]  Edgar Sanchez-Sinencio,et al.  High frequency compensated current-mode ladder filters using multiple output OTAs , 1994 .

[4]  M. Bhushan,et al.  Grounding of capacitors in integrated circuits , 1967 .

[5]  G. Ferri,et al.  A 1.5-V current-mode capacitance multiplier , 1998, Proceedings of the Tenth International Conference on Microelectronics (Cat. No.98EX186).

[6]  G. Di Cataldo,et al.  Active capacitance multipliers using current conveyors , 1998, ISCAS '98. Proceedings of the 1998 IEEE International Symposium on Circuits and Systems (Cat. No.98CH36187).

[7]  Iqbal A. Khan,et al.  Wide range electronically tunable component multipliers , 1988 .

[8]  Kirat Pal,et al.  New inductance and capacitor floatation schemes using current conveyors , 1981 .

[9]  Shahram Minaei,et al.  A Versatile Active Circuit for Realising Floating Inductance, Capacitance, FDNR and Admittance Converter , 2006 .

[10]  M. T. Ahmed,et al.  OTA-based integrable voltage/current-controlled ideal C-multiplier , 1986 .

[11]  Anwar A. Khan,et al.  Current conveyor based R- and C- multiplier circuits , 2002 .

[12]  R. Puers,et al.  A Multi-Purpose CMOS Sensor Interface for Low Power Applications , 1993, ESSCIRC '93: Nineteenth European Solid-State Circuits Conference.

[13]  Giuseppe Fern,et al.  Low voltage low power CMOS front-ends for capacitive sensors , 1997 .

[14]  M. T. Ahmed,et al.  Novel electronically tunable C-multipliers , 1995 .

[15]  Jean-Pierre Chante,et al.  A current conveyor based capacitive multiplier , 1997, Proceedings of 40th Midwest Symposium on Circuits and Systems. Dedicated to the Memory of Professor Mac Van Valkenburg.

[16]  D. R. Frey,et al.  Log-domain filtering: An approach to current-mode fil-tering , 1993 .

[17]  Muhammad Taher Abuelma'atti,et al.  Electronically tunable capacitance multiplier and frequency-dependent negative-resistance simulator using the current-controlled current conveyor , 1999 .