Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-02-01
2005-02-01
Tokar, Michael (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000
Reexamination Certificate
active
06850177
ABSTRACT:
A method and circuit are provided for converting a digital signal to an analog signal in the form of a pulse width modulated (PWM) pulse (20). The PWM pulse is generated during an output cycle of a pulse generator to form a pulsetrain output of pulses at a fixed frequency whose widths are determined by dynamically changing digital input data. The method includes the steps of dividing the digital data signal into most significant bit (MSB) and least significant bit (LSB) portions. A PWM pulse is initiated at the beginning of an output cycle and continues while the MSB portion counts down in a counter (24). At the same time, the LSB portion of the digital data signal is converted to a precise phase delay signal which is a subcycle of an oscillator controlling the counter. This phase delay signal is generated after the termination of the MSB count, and halts the high period of the PWM pulse during the output cycle. When the output cycle ends, the process is repeated with the next digital signal.
REFERENCES:
patent: 4958159 (1990-09-01), Wyatt
patent: 5245593 (1993-09-01), Yamate
patent: 5457457 (1995-10-01), Hayashi
patent: 6594308 (2003-07-01), Galbiati et al.
Donovan Brian
McKaig Ray S.
Chernoff Vilhauer McClung & Stenzel LLP
Nguyen Khai
Tokar Michael
Xyron Corporation
LandOfFree
Digital to analog convertor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital to analog convertor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital to analog convertor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3478434