Patent ID: 8823427
Filing Date: 2014-09-02
Classification: G06F

Abstract:
1. A method for generating a ramp comprising: providing a DC voltage reference source; providing a summing amplifier; providing n switched capacitor elements coupled in parallel between the DC voltage reference source and the summing amplifier, where n is an integer greater than 1; selectively activating the switched capacitor elements to first store charge on each activated switched capacitor element and then to measure the sum of the charges on the activated capacitor switch elements in each of a fixed-integer number of non-overlapping time slots in a cyclical manner to generate a ramp, the slope of the ramp being selectable by activating from between 1 and n the number of switched capacitor elements in the non-overlapping time slots, activation of the switched capacitor elements being rotated among the n switched capacitor elements in the non-overlapping time slots.