Title:
A METHOD AND SYSTEM FOR ANALOG TO DIGITAL CONVERSION USING DIGITAL PULSE WIDTH MODULATION (PWM)
Document Type and Number:
WIPO Patent Application WO2005104377
Kind Code:
A3
Abstract:
A system and method for analog-to-digital conversion (118) using digital pulse width modulation (PWM) is disclosed. The method and system according to the disclosed invention converts an analog input signal (104) to a digital signal in pulse code modulated (PCM) form (106). The disclosed invention uses a feedback circuit (114) to perform PWM of the analog input signal. The PWM signal is then decimated to obtain the digital signal in PCM form. The system according to the disclosed invention requires lower operating frequency and dissipates lesser power than prior art systems providing the same sampling frequency and resolution. The operation at a lower frequency is achieved by obtaining two samples from every pulse of the PWM signal; the first sample being obtained from the right duty ratio. Further the disclosed invention has lesser implementation complexity and higher signal-to-noise ratio than prior art.
Inventors:
MIDYA PALLAB (US)
MILLER MATTHEW R (US)
RAKERS PATRICK L (US)
MILLER MATTHEW R (US)
RAKERS PATRICK L (US)
Application Number:
PCT/US2005/007848
Publication Date:
May 18, 2006
Filing Date:
March 10, 2005
Export Citation:
Assignee:
MOTOROLA INC (US)
MIDYA PALLAB (US)
MILLER MATTHEW R (US)
RAKERS PATRICK L (US)
MIDYA PALLAB (US)
MILLER MATTHEW R (US)
RAKERS PATRICK L (US)
International Classes:
H03M1/34; H03M1/12; H03M1/50; H03M3/02
Foreign References:
| US6674387B1 | 2004-01-06 | |||
| US6445326B1 | 2002-09-03 | |||
| US5883590A | 1999-03-16 |
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