Title:
【発明の名称】増幅器の非線形性を補償する方法、増幅器と、および該方法並びに該増幅器の使用方法
Document Type and Number:
Japanese Patent JP2002506308
Kind Code:
A
Abstract:
In a method and an amplifier for the compensation of unlinearities e.g. of the class D type, wherein an audio signal is pulse-width modulated, e.g. with a carrier wave signal in the form of a triangular signal to provide a pulse-width modulated small-signal, the so-called multiplicative error signals, which occur prior to the provision of a pulse-width modulated great-signal (7), are detected in a detector (10)). It is noted that the carrier wave signal could be analog as well as digital. The signal from the detector, which is derived on the basis of differences between the pulse widths of the small-signals and the pulse widths of the great-signals, is used for changing the carrier wave signal so that the amplifier gets a constant gain in the entire audio range and is thereby linearized. To compensate additionally for the multiplicative errors which manifest themselves in the pulse height as well as the pulse width of the pulse-width modulated great-signal (7), the value of the carrier wave signal is changed as a function of the pulse-width modulated small-signal (5) multiplied by the pulse-width modulated great-signal and the inverted pulse-width modulated small-signal multiplied by the inverted pulse-width modulated great-signal.
Inventors:
Nils Anderskov
Lars Lisbo
Thomas Merck
Lars Lisbo
Thomas Merck
Application Number:
JP2000535088A
Publication Date:
February 26, 2002
Filing Date:
March 03, 1999
Export Citation:
Assignee:
Tokata Technology Ampalto Cell Scab
International Classes:
H03F3/217; H03K7/08; H03F1/32; (IPC1-7): H03F1/32; H03F3/217
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)