D.-R. Huang, S.-W. Kao, and Y.-H. Pang, "A WiMAX Receiver with
Variable Bandwidth of 2.5 - 20 MHz and 93 dB Dynamic Gain Range in
0.13-╬╝m CMOS Process", IEEE Radio Frequency Integrated Circuits
Symposium, June 2007, pp. 369-372.
 S. Hori, T. Maeda, H. Yano, N. Matsuno, K. Numata, N. Yoshida, Y.
Takahashi, T. Yamase, R. Walkington, and H. Hida, "A Widely Tunable
CMOS Filter With Neg- ative Source Degeneration Resistor
Transconductor", IEEE Solid-State Circuits Conference, Sept. 2003, pp.
 J. Jiang; Y. Wang, "Design of A Tunable Frequency CMOS Fully
Differential Fourth-order Chebyshev Filter", Elsevier, Microelectronics
Journal, vol. 37, June 2006, pp. 84-90.
 D.A. Johns and K.W. Martin, Analog Integrated Circuit Design, Wiley,
New York, 1997.
 T. sanchez-Rodriguez, C.I. Lujan-Martinez, R.G. Carvajal, J. Ramirez-
Angulo and A. Lopez-Martin, "CMOS Linear Programmable
Transconductor Suitable For Adjustable Gm-C Filters", Electronics
Letters, vol. 44, no. 8, April 2008, pp. 505-506.
 E. Sanchez-Sinencio, "Common-mode Feedback Techniques: A
Tutorial", Texas A&M University, Feb. 2005.
 U. Stehr, F. Henkel, L. Dalluge, P. Waldow, "A Fully Differential
CMOS Integrated 4th Order Reconfigurable Gm-C Lowpass Filter for
Mobile Applications", IEEE International Conference on Electronics,
Circuits and Systems (ICECS), vol. 1, Dec. 2003, pp. 144-147.