Title :
Envelope currents method with extended dynamic range for the simulation of nonlinear communication circuits
Author :
Crespo-Cadenas, Carlos ; Reina-Tosina, Javier
Author_Institution :
Dept. Ingenieria Electronica, Seville Univ., Spain
Abstract :
A novel approach to analyze the effects of nonlinear distortion in communication circuits is reported based on a recursive algorithm. In each iteration a time-varying linear circuit excited by appropriate nonlinear currents obtained from an expansion of the nonlinearity is analyzed. This procedure has been applied to a common-source HEMT amplifier excited with a single tone and results show a very fast convergence together with a high dynamic range. The technique was used in the evaluation of the spectral regrowth and constellation distortion of a QPSK signal with raised cosine and root raised cosine conforming pulses produced by the amplifier at 5.8 GHz.
Keywords :
HEMT circuits; amplifiers; circuit simulation; nonlinear distortion; nonlinear network analysis; recursive estimation; time-varying networks; 5.8 GHz; QPSK signal; circuit simulation; common-source HEMT amplifier; constellation distortion; envelope currents method; extended dynamic range; nonlinear communication circuits; nonlinear currents; nonlinear distortion; recursive algorithm; root raised cosine; spectral regrowth; time-varying linear circuit; Algorithm design and analysis; Circuit simulation; Constellation diagram; Convergence; Dynamic range; HEMTs; Linear circuits; Nonlinear distortion; Pulse amplifiers; Quadrature phase shift keying;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1263003
