Sigma-Delta DAC Feedback Using Common-Mode Voltage to Cut Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sigma delta modulators experience increased power consumption due to redundant reference voltages in digital to analog converter circuits, leading to unnecessary load current and inefficiency.
Innovation Solution
The sigma delta modulator device and method incorporate a sampling circuit, digital to analog converter circuit, and integrator circuit, where the digital to analog converter combines a first digital signal with a common mode voltage instead of redundant reference voltages, reducing dynamic current consumption by using a common voltage during integration phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference voltages are used in the digital to analog converter circuit, then the conversion accuracy is improved, but the power consumption increases due to redundant reference voltage causing unnecessary load current
Solution Approach 1:
The patent extracts and eliminates the redundant reference voltage from the digital to analog converter circuit. By using a single reference voltage instead of multiple reference voltages, the circuit removes unnecessary load current paths while maintaining the required conversion accuracy through optimized circuit topology and capacitor switching arrangements.
2Measurement precision
If multiple reference voltages are used in the digital to analog converter circuit, then the conversion accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent removes the redundant reference voltage components from the circuit, simplifying the digital to analog converter structure. The single reference voltage approach reduces the number of voltage sources, switches, and associated control logic required, thereby decreasing overall circuit complexity while preserving conversion precision through alternative circuit design.
3Use of energy by moving object
If a common mode voltage is used instead of redundant reference voltages, then the power consumption is reduced, but the integrator circuit performance may be affected
Solution Approach 1:
The patent changes the voltage parameter from multiple reference voltages to a single common mode voltage combined with differential signaling in the integrator circuit. This parameter change reduces power consumption by eliminating redundant voltage sources while maintaining integrator performance through balanced differential capacitor switching and optimized feedback paths that preserve signal integrity and integration accuracy.
Data Source
AI summary
A sigma delta modulator device includes a sampling circuit, a digital to analog converter circuit, an integrator circuit, and an analog to digital converter circuit. The sampling circuit is configured to sample an input signal, in order to generate a first signal. The digital to analog converter circuit is configured to convert a first digital signal to be a combination of a first reference voltage and a common mode voltage, in order to generate a second signal, in which the first reference voltage is one of a positive reference voltage and a negative reference voltage. The integrator circuit is configured to perform integration according to the first signal and the second signal, in order to generate a third signal. The analog to digital converter circuit is configured to quantize the third signal to generate an output signal, and to generate the first digital signal according to the output signal.