Delta-Sigma Noise Coupler Circuit With Fewer Control Signals
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Solution Overview
Problem
Conventional delta-sigma modulators have complex circuit structures due to their noise coupler configurations, increasing circuit control complexity.
Innovation Solution
A delta-sigma modulator design that includes a loop filter, a noise coupler with an amplifier and capacitor, and a digital-to-analog converter, where the noise coupler generates a noise coupled signal by coupling the filtered signal with the difference between the noise coupled signal and the feedback signal, reducing the number of switches and control signals required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional noise coupler configuration is used, then effective noise shaping is achieved, but circuit control complexity increases
Solution Approach 1:
The patent combines multiple switches and control signals into a reduced configuration. Specifically, the noise coupler uses fewer switches (reducing from 12 to a smaller number) and fewer control signals (reducing from 8 to a smaller number) while maintaining the third-order noise shaping function through a simplified circuit topology that integrates the noise coupling function more efficiently.
Solution Approach 2:
The simplified noise coupler design achieves multi-functionality by using a compact configuration of switches and control signals that perform multiple functions simultaneously - noise coupling, signal routing, and feedback integration - thereby reducing overall circuit complexity while maintaining effective noise shaping performance.
2Reliability
If a conventional noise coupler with multiple switches is used, then noise shaping function is maintained, but the number of control signals increases
Solution Approach 1:
The patent merges the control functions of multiple switches into a reduced set of control signals. The noise coupler implementation uses fewer control signals that simultaneously control multiple switches, reducing the control signal count from 8 to a smaller number while maintaining the third-order noise shaping function through coordinated switch operation.
Data Source
AI summary
A delta-sigma modulator includes: a loop filter for processing an analog input signal and a feedback signal to generate a filtered signal; a noise coupler operable to generate a noise coupled signal based on the filtered signal and the feedback signal; a quantizer for quantizing the noise coupled signal to generate a digital output signal; and a digital-to-analog converter converting the digital output signal to the feedback signal. The noise coupler includes an amplifier that has an inverting input terminal receiving a difference between the filtered signal and the feedback signal, and a non-inverting output terminal outputting the noise coupled signal, and a capacitor coupled between the inverting input terminal and the non-inverting output terminal of the amplifier.