PROGRAMMABLE ANALOG-TO-DIGITAL CONVERTER FOR LOW-POWER DC-DC SMPS
First Claim
1. A circuit comprising:
- a sigma-delta DAC that receives a digital value and outputs an analog output whose average is related to the digital value; and
a windowed ADC converter including a reference voltage-to-time converter that is adjusted using an output of the sigma-delta DAC and a measurement voltage-to-time converter that is adjusted using an output voltage wherein the windowed ADC converter determines an error value and wherein the delay lines act as a moving average filter.
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Accused Products
Abstract
A voltage-to-time based windowed analog-to-digital converter (ADC) can have programmable reference voltage, conversion time, and accuracy of voltage regulation. The ADC can be fully implemented on a small silicon area and is suitable for implementation in various integrated digital controllers for high-frequency low-power switch-mode power supplies (SMPS). The programmable characteristics can be achieved through the utilization of the inherent averaging effect of the delay line or of the other voltage-to-time conversion structures and through the adjustments of delay cells'"'"' propagation times or the effective voltage-to-time conversion ratio in alternative structures.
21 Citations
31 Claims
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1. A circuit comprising:
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a sigma-delta DAC that receives a digital value and outputs an analog output whose average is related to the digital value; and a windowed ADC converter including a reference voltage-to-time converter that is adjusted using an output of the sigma-delta DAC and a measurement voltage-to-time converter that is adjusted using an output voltage wherein the windowed ADC converter determines an error value and wherein the delay lines act as a moving average filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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24. A circuit comprising:
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a sigma-delta unit; and a second unit connected to the output of the sigma-delta unit, the second unit including a reference voltage-to-time converter and measurement voltage-to-time converter wherein the second unit acts as a low pass filter for the output and the sigma-delta unit. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification