Method and apparatus for increasing the resolution of a digital to analog converted pulse width modulated signal
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United States of America Patent
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Nov 28, 1995
Grant Date -
N/A
app pub date -
Oct 1, 1993
filing date -
Oct 1, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for increasing the resolution of a pulse width modulated signal representative of a measured parameter such as the pressure measured by a pressure cell. The analog signal from the pressure cell is converted to a digital signal using a predetermined clock frequency. The digital signal is scaled to 2.sup.N (N is an integer greater than or equal to one) times the clock frequency and the N lowest order bits are checked to determine if they are a one or a zero. A one is added to the least significant bit of the scaled digital signal in a predetermined manner in the next N consecutive cycles of the scaled digital signal dependent upon the which of the N lowest order bits are a one.
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