Fast response digital interface apparatus and method

Details Fast response digital interface apparatus and method Fast response digital interface apparatus and method

H - Electricity

03

M

354/97

H03M 1/66 (2006.01) G01D 5/246 (2006.01) H03K 7/08 (2006.01)

Patent

CA 2031881

FAST RESPONSE DIGITAL INTERFACE APPARATUS AND METHOD ABSTRACT The digital interface divides a digital number (No) representing the sensor reading into a most significant part (MSB) and a least significant part (LSB). The most significant part is used to determine the pulse width of a sequence of pulses and the least significant part is used to selectively modify the pulses by increasing the pulse width of selected ones of the pulses. A lookup table (54) is used to evenly distribute the lengthened pulses throughout the pulse train. The resulting waveform has a DC component representative of the original digital number which is extracted by low pass filtering. The energy in the non-DC spectral components is appreciably attenuated as compared to the spectrum of a standard pulse width modulated waveform. This makes it possible to use a filter (28) with considerably higher cutoff frequency and with considerably improved response time for a given resolution.

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