Pulse or digital communications – Pulse width modulation
Reexamination Certificate
2006-10-31
2006-10-31
Kim, Kevin (Department: 2611)
Pulse or digital communications
Pulse width modulation
C332S109000
Reexamination Certificate
active
07130346
ABSTRACT:
A method and apparatus having a digital pulse width modulation generator with integral noise shaping is provided. The apparatus for generating a digital pulse width modulation signal includes a random period signal generator, a noise shaping unit, a duty ratio quantizer, and a PWM counter. The random period signal generator generates a random period signal. The noise shaping unit is responsive to at least a digital signal, the random period signal, and a delayed digital signal for generating a corrected signal. The duty ratio quantizer is responsive to the corrected digital signal, the random period signal, and a quantization clock signal, and generates a first duty ratio signal and a second duty ratio signal. The PWM counter is responsive to the first and second duty ratio signals and a quantization clock signal, and generates positive and negative PWM signals, respectively.
REFERENCES:
patent: 5077539 (1991-12-01), Howatt
patent: 5933453 (1999-08-01), Lewison
patent: 6414613 (2002-07-01), Midya et al.
patent: 6515604 (2003-02-01), Delano
patent: 6545533 (2003-04-01), Karki et al.
patent: 6549085 (2003-04-01), Wagh et al.
patent: 6580322 (2003-06-01), Miao et al.
patent: 6587010 (2003-07-01), Wagh et al.
patent: 6594309 (2003-07-01), Botti et al.
patent: 6605991 (2003-08-01), Midya et al.
patent: 6606044 (2003-08-01), Roeckner et al.
patent: 2003/0042868 (2003-03-01), Muramatsu
patent: 2003/0122692 (2003-07-01), Roeckner et al.
patent: 2004/0062303 (2004-04-01), Midya et al.
patent: 2004/0239417 (2004-12-01), Kowkutla et al.
Yoneya, A. and Watanabe, A., “Low Distortion Digital Pulse Width Modulation fir Audio Class-D Amplifier,” Communications and Information Technology, 2004, ISCIT, IEEE International Symposium on, vol.1, Oct. 26-29, 2004, pp. 515-518.
Fang Jing
Midya Pallab
Balconi-Lami Michael J.
Freescale Semiconductor Inc.
Kim Kevin
LandOfFree
Method and apparatus having a digital PWM signal generator... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus having a digital PWM signal generator..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus having a digital PWM signal generator... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3621733