Delta-Sigma Modulator Feedback Switching for High Resolution
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Solution Overview
Problem
Existing delta-sigma modulators face challenges in achieving high resolution at low power consumption, particularly in efficiently switching between different feedback coefficients during operation periods, which affects noise and phase conditions.
Innovation Solution
A delta-sigma modulator architecture that includes a first integral unit and a second integral unit, both with feedback paths, where the first integral unit operates with a feedback coefficient of 1 during the first period and 0 during the second period, and the second integral unit operates with a feedback coefficient of 1 during the first period and greater than 1 during the second period, using a single DA converter and control circuit to manage these operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DA converter is used for multiple integrators, then device complexity is reduced, but it becomes difficult to efficiently switch between different feedback coefficients during operation periods
Solution Approach 1:
The patent implements dynamic switching of feedback coefficients by controlling the first integral unit to operate with feedback coefficient of 1 during the first period and 0 during the second period, while the second integral unit operates with feedback coefficient of 1 during the first period and greater than 1 during the second period. This dynamic reconfiguration allows a single DA converter to serve multiple integrators with different feedback characteristics at different times, resolving the contradiction between device complexity and adaptability.
2Measurement precision
If feedback coefficient is changed during operation, then noise management and resolution are improved, but phase consistency and signal stability deteriorate
Solution Approach 1:
The patent employs periodic action by dividing operation into distinct first and second periods with specific feedback coefficient configurations. During the first period, both integral units operate with feedback coefficient of 1 for stable integration. During the second period, the first integral unit switches to feedback coefficient of 0 while the second integral unit switches to feedback coefficient greater than 1 for noise management and resolution enhancement. This periodic switching maintains phase consistency within each period while achieving improved resolution overall.
Data Source
AI summary
Provided is a delta-sigma modulator including a first integral unit configured to integrate an input analog signal, a second integral unit configured to integrate a signal output by the first integral unit, a quantizer configured to quantize a signal output by the second integral unit, a DA converter configured to perform DA conversion on an output of the quantizer and output a feedback signal to be fed back to the first integral unit, and a control unit configured to perform control to cause the first integral unit and the second integral unit to perform different integral operations during a first period and a second period, in which the second integral unit is configured to receive the feedback signal output by the DA converter via the first integral unit and integrate the feedback signal during the first period and the second period.