Current mode quadrature oscillator using current differencing transconductance amplifiers (CDTA)

A CDTA-based quadrature oscillator circuit is proposed. The circuit employs two current-mode allpass sections in a loop, and provides high-frequency sinusoidal oscillations in quadrature at high impedance output terminals of the CDTAs. The circuit has no floating capacitors, which is advantageous from the integrated circuit manufacturing point of view. Moreover, the oscillation frequency of this configuration can be made adjustable by using voltage controlled elements (MOSFETs), since the resistors in the circuit are either grounded or virtually grounded.

[1]  Ahmed M. Soliman,et al.  Generation of current conveyor-based all-pass filters from op amp-based circuits , 1997 .

[2]  J. Horng.  Current Differencing Buffered Amplifiers Based Single Resistance Controlled Quadrature Oscillator Employing Grounded Capacitors , 2002, IEICE Trans. Fundam. Electron. Commun. Comput. Sci..

[3]  Hussein Baher,et al.  Analog & digital signal processing , 1990 .

[4]  Hakan Kuntman,et al.  Canonical Biquadratic All-pass and Notch Filters Employing Differential Difference Current Conveyor , 2003 .

[5]  Brent Maundy,et al.  A novel CMOS first-order all-pass filter , 2002 .

[6]  Ahmed M. Soliman,et al.  Novel MOS-C quadrature oscillator using the differential current voltage conveyor , 1999, 42nd Midwest Symposium on Circuits and Systems (Cat. No.99CH36356).

[7]  Oguzhan Cicekoglu,et al.  A New All-pass Section for High-Performance Signal Processing with a Single CCII– , 2003 .

[8]  Z. Czarnul.  Novel MOS resistive circuit for synthesis of fully integrated continuous-time filters , 1986 .

[9]  Nobuo Fujii,et al.  Generalization of MRC circuits and its application , 1997 .

[10]  Sudhanshu Maheshwari,et al.  Simple first-order translinear-C current-mode all-pass sections , 2003 .

[11]  Ahmed M. Soliman,et al.  Novel oscillators using the operational transresistance amplifier , 2000 .

[12]  Dalibor Biolek,et al.  Current-mode KHN filter employing current differencing transconductance amplifiers , 2006 .

[13]  Sudhanshu Maheshwari.  New voltage and current-mode APS using current controlled conveyor , 2004 .

[14]  A. Sedra.  Microelectronic circuits , 1982 .

[15]  R. I. Salawu.  Realization of an all-pass transfer function using the second generation current conveyor , 1980 .

[16]  A. Toker,et al.  Supplementary all-pass sections with reduced number of passive elements using a single current conveyor , 2001 .

[17]  Ali Toker,et al.  Novel All-Pass Filter Section Using Differential Difference Amplifier , 2004 .

[18]  Erhan Hancioglu,et al.  CDBA‐Based Synthetic Floating Inductance Circuits with Electronic Tuning Properties , 2005 .

[19]  O. Cicekoglu,et al.  DESIGN OF FIRST-ORDER ALLPASS FILTERS EMPLOYING SINGLE MODIFIED THIRD GENERATION CURRENT CONVEYOR , 2003 .

[20]  Hakan Kuntman,et al.  All-pass filters using a single current conveyor , 1999 .

[21]  Oguzhan Cicekoglu,,et al.  New Realizations of Current Mode Tunable All-pass Filters , 2003 .

[22]  Ali Toker,et al.  Tunable allpass filter for low voltage operation , 2003 .

[23]  A. Toker,et al.  Current-mode all-pass filters using current differencing buffered amplifier and a new high-Q bandpass filter configuration , 2000 .

[24]  Mohammed Ismail,et al.  Describing functions and oscillators , 2001 .

[25]  Hakan Kuntman,et al.  All-Pass Filters Using A Single Current Conveyor , 1998, Proceedings of the 6th International Conference on Optimization of Electrical and Electronic Equipments.

[26]  S. Minaei,et al.  New Current-Mode Integrator and All-Pass Section without External Passive Elements and Their Application to Design a Dual-Mode Quadrature Oscillator , 2003 .