Floating triangle analog-to-digital conversion system and method

Details Floating triangle analog-to-digital conversion system and method Floating triangle analog-to-digital conversion system and method

1996-12-27

1999-04-13

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341166, H03M 160

Patent

active

058942823

ABSTRACT:
An analog-to-digital converter utilizing pulse width modulation and ramp and count techniques. A microcontroller generates the pulse width modulated digital signal which is converted into a floating triangle. When the floating triangle signal is equal to the analog, input signal, a comparator generates and output which is sensed by the microcontroller. During an initialization process, the microcontroller uses information with respect to the timing of the comparator output to adjust the duty cycle so that the triangle wave remains within maximum and minimum levels above and below the analog, output signal. Calculation of the voltage, of the input signal is made as a function of the timing of the comparator outputs on successive upward ramps of the floating triangle signal, and of the slope of the upward ramp signal. As a result, the analog-to-digital converter utilizes the same process for low and high resolution measurements, thereby significantly decreasing its cost and increasing its speed.

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