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Title:
PULSE WIDTH MODULATOR AND AUDIO SIGNAL OUTPUT DEVICE
Document Type and Number:
Japanese Patent JP2013017047
Kind Code:
A
Abstract:

To provide a pulse width modulator that has an increased dynamic range by implementing an increased resolution.

The pulse width modulator includes: a sequence counter 24 for counting a count value in synchronism with a clock; an intermediate register processing section 20 for changing a pulse width chronologically symmetrically with respect to a change time point of the switching period of an input signal by reference to the counter value from the sequence counter if the input signal is a first input signal pattern type or changing the pulse width one clock longer on the earlier or later side of the change time point of the switching period of the input signal by reference to the counter value from the sequence counter if the input signal is a second input signal pattern type, and outputting corresponding intermediate register values; and a decoder 22 for generating an output signal based on the intermediate register values from the intermediate register processing section by reference to the counter value from the sequence counter.


Inventors:
YOKOYAMA YASUTOMO
Application Number:
JP2011148457A
Publication Date:
January 24, 2013
Filing Date:
July 04, 2011
Export Citation:
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Assignee:
ROHM CO LTD
International Classes:
H03K7/08; H03F3/217
Domestic Patent References:
JP2004032095A2004-01-29
JP2009525642A2009-07-09
JP2004357450A2004-12-16
JP2005341568A2005-12-08
JP2005277818A2005-10-06
Attorney, Agent or Firm:
Hidekazu Miyoshi
Keishin Terayama
Hiroyuki Miyoshi
Ichitaro Ito