Advanced SearchSearch Tips
Compensation of the Non-linearity of the Audio Power Amplifier Converged with Digital Signal Processing Technic
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Compensation of the Non-linearity of the Audio Power Amplifier Converged with Digital Signal Processing Technic
Eun, Changsoo; Lee, Yu-chil;
  PDF(new window)
We propose a digital signal processing technic that can compensate the non-linearity inherent in audio amplifiers, and present the result of the simulation. The inherent non-linearity of the audio power amplifier arising from analog devices is compensated via a digital signal processing technic consisting of indirect learning architecture and an adaptive filter. The simulation results show that the compensator can be realized using a third-order polynomial and compensates odd-order non-linearity efficiently. The even-oder non-linearity is mainly due to the dc offset at the output, which is difficult to eliminate with the proposed method. Care must be taken in designing the bias circuit to avoid the DC offset at the output. The proposed technic has significance in that digital signal processing technic can compensate for the impairment that is an inherent characteristic of an analog system.
Convergence of analog and digital systems;nonlinear compensation;audio amplifier;indirect learning architecture;adaptive filter;
 Cited by
Ballesteros E., Perez F., and Perez J., “Analysis and Design of Microwave Linearized Amplifiers Using Active Feedback,” IEEE Trans. On Microwave Theory and Tech., Vol. 44, No. 1, pp. 499-504, 1988.

F. J. Casadevall, "The LINC transmitter," RF Design, pp. 41-48, Feb. 1990.

Fernando Casadevall, "On the behavior of the LINC transmitter," IEEE Trans. On Vehicular Tech., pp. 29-34, 1990.

James K. Cavers, “Amplifier Linearization Using a Digital Predistorter with Fast Adaptation and Low memory Requirements,” IEEE Trans. On Vehicular Tech., Vol. 39, No. 4, pp. 374-382, 1990. crossref(new window)

James K. Cavers, “Adaptation Behavior of a Feedforward Amplifier Linearizer,” IEEE Trans. On Vehicular Tech., Vol. 44, No. 1, pp. 31-40, 1995. crossref(new window)

Changsoo Eun and Edward J. Powers, “A New Volterra Predistorter Based on the Indirect Learning Architecture,” IEEE Trans. On Signal Processing, Vol. 45, No. 1, pp. 223-227, 1997. crossref(new window)

Youngoo Yang, Youngsik Kim, Jeahyok Yi, Joongjin Nam, Bumman Kim, Wonwoo Kang, and Shinwook Kim, "Digital Controlled Adaptive Feedforward Amplifier for IMT-2000 Band," IEEE MIT-S Digest, pp. 1487-1490, 2000.

Min Kim, Hayeon Shin, and Changsoo Eun, “Compensation of the Nonlinearity of the High-Power Amplifiers with Memory Using a Digital Feedforward Scheme,” Journal of IEIE-TC, Vol. 49, No. 4, pp. 9-17, 2012.

G. Randy Slone, High-Power Audio Amplifier Construction Manual, McGraw-Hill, 1999.

G. R. Slone, The Audiophile's Project Sourcebook, McGraw-Hill, 2002.

Douglas Self, Audio Power Amplifier Design Handbook, Newnes, 2002.

Bob Cordell, Designing Audio Power Amplifiers, McGraw-Hill/TAB Electronics, 2015.

Steven Kay, Fundamentals of Statistical Signal Processing, Volume I: Estimation Theory, Prentice Hall, 1993.

M. Schetzen, “Theory of pth-Order Inverse of Nonlinear Systems,” IEEE Trans. on Circuits and Systems, Vol. 23, No. 5, pp. 285-291, 1976. crossref(new window)

S. Lim and C. Eun, “Predistorter Design for a Memoryless Nonlinear High Power Amplifier Using the pth -Order Inverse Method for OFDM Systems,” Journal of KICS, Vol. 31, No. 2C, pp. 191-199, 2006.

Seiji Ohmori, Xu Guangsheng, Osamu Muta and Yoshihiko Akaiwa, "An Adaptive Pre-distortion Method Based on Orthogonal Polynomial Exapansion for Non-linear Distortion Compensation," The 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC'07), Athens, 2007.