Title:
CLASS-D ELECTRICAL AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2010/067823
Kind Code:
A1
Abstract:
A class-D electrical amplifier (100) comprises a signal input terminal (120), wherein an analog signal is inputted, an analog signal processing unit (130), which amplifies the analog signal, an integration circuit (140), which integrates the analog signal that is outputted from the analog signal processing unit (130), a pulse width modulation (PWM) circuit (150), which applies pulse width modulation (PWM) to the integrated signal that is outputted from the integration circuit (140) and outputs a PWM signal that lies within a range of a first duty ratio, a duty ratio adjustment circuit (200), which adjusts the pulse width of the PWM signal that is outputted from the PWM circuit (150) to lie within a range of a second duty ratio that is narrower than the range of the first duty ratio, and a first driver (170), a second driver (180), and power transistors (TR1, TR2), which process the PWM signal that is outputted from the duty ratio adjustment circuit (200).
Inventors:
TAKAGI RYO (JP)
TAKAHATA KOJI (JP)
TAKAHATA KOJI (JP)
Application Number:
PCT/JP2009/070612
Publication Date:
June 17, 2010
Filing Date:
December 09, 2009
Export Citation:
Assignee:
ROHM CO LTD (JP)
TAKAGI RYO (JP)
TAKAHATA KOJI (JP)
TAKAGI RYO (JP)
TAKAHATA KOJI (JP)
International Classes:
H03F3/217; H03F1/00
Foreign References:
| JP2007209038A | 2007-08-16 | |||
| JP2008263519A | 2008-10-30 | |||
| JPH06319197A | 1994-11-15 |
Attorney, Agent or Firm:
FUKAMI, Hisao et al. (JP)
Hisao Fukami (JP)
Hisao Fukami (JP)
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