Open AccessUseful Characteristics for Controlling the Cancellation Performance and Center Frequency of a Linearization Loop
Author(s) -
Kang Sanggee,
Hong Sungyong
Publication year - 2006
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.06.0204.0048
Subject(s) - linearization , control theory (sociology) , feed forward , bandwidth (computing) , amplitude , loop (graph theory) , feedback linearization , transfer function , center frequency , nonlinear system , mathematics , computer science , electronic engineering , engineering , control engineering , physics , telecommunications , control (management) , electrical engineering , quantum mechanics , artificial intelligence , combinatorics , band pass filter
The cancellation performance of a linearization loop is limited by the degree of an amplitude imbalance and a phase imbalance. A delay mismatch causes a phase variation as a function of frequency. Therefore, the cancellation performance and linearization bandwidth are limited by a delay mismatch. The expression for the effects of an amplitude imbalance, a phase imbalance, and a delay mismatch on the characteristics of a linearization loop is derived and analyzed. The simulation results are compared with the results obtained by means of using a commercial simulation tool and the exact agreement is reported. The derived equation could be used in designing a linearization loop and predicting the cancellation performance of the linearization loop usefully. Some useful characteristics, known from the simulation results obtained by using the derived equation, of a linearization loop for designing and implementing feedforward amplifiers are described in detail.