Title:
パルス幅変調信号を発生する方法および装置
Document Type and Number:
Japanese Patent JP4221302
Kind Code:
B2
Abstract:
A method and apparatus for a pulse width modulated (PWM) signal (30, 130) is provided. The input is a digital signal which is a modulated signal (24, 124). In the illustrated form, the modulated input signal is either a PDM signal or a PCM signal. In one embodiment of the present invention a PCM to PWM converter (16, 116) includes correction of duty ratio circuitry (48). The methodology used may include recursion on the values obtained after prediction, interpolation, and correction. The digital to analog conversion system (10) uses a PDM to PWM converter (20) which operates in an all digital domain and includes no analog circuitry.
Inventors:
Wrecker, William Jay.
Midya, Parab
Wag, Poojan Ay.
Lindark Necht, William Jay.
Midya, Parab
Wag, Poojan Ay.
Lindark Necht, William Jay.
Application Number:
JP2003561103A
Publication Date:
February 12, 2009
Filing Date:
December 13, 2002
Export Citation:
Assignee:
Freescale Semiconductor, Inc.
International Classes:
H03K7/08; H03M3/04; H03F3/217; H03M5/08; H03M5/10; H03M1/82
Domestic Patent References:
| JP53121451A | ||||
| JP5505287A | ||||
| JP4207817A | ||||
| JP6506091A | ||||
| JP4355518A | ||||
| JP2000507759A | ||||
| JP2001223590A |
Attorney, Agent or Firm:
Mamoru Kuwagaki