Charge-Sharing Integrator for Fast, Linear Delta-Sigma Modulators
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Solution Overview
Problem
Delta-sigma modulators face challenges in achieving high linearity and operating speed, particularly with low power supply voltages, due to limitations in existing integrator designs such as transconductance and operational amplifier integrators.
Innovation Solution
A delta-sigma modulator device incorporating a charge sharing integrator that combines the advantages of transconductance and operational amplifier integrators, using an operational amplifier and integration capacitor with a switch-controlled digital-analog converter to apply and isolate signals, allowing for improved linearity and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a transconductance integrator is used, then operating speed is improved, but linearity deteriorates
Solution Approach 1:
The patent merges the advantages of transconductance integrators (high speed) and operational amplifier integrators (high linearity) into a single hybrid structure. The charge sharing integrator combines the fast charging capability of transconductance with the linear voltage control of operational amplifiers, achieving both high operating speed and high linearity simultaneously.
2Manufacturing precision
If an operational amplifier integrator is used, then linearity is improved, but operating speed deteriorates
Solution Approach 1:
The hybrid charge sharing integrator structure combines the linear voltage control of operational amplifiers with the fast charging mechanism of transconductance, allowing the system to achieve both high linearity and high operating speed that neither structure can achieve alone.
3Reliability
If the first integrator supports severe noise and linearity constraints, then modulator performance is improved, but device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by merging two integrator types into one unified structure. Rather than requiring separate high-performance components, the hybrid charge sharing integrator achieves superior performance through its integrated design, reducing overall system complexity while improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The charge sharing integrator enhances linearity and operating speed while reducing consumption, achieving a signal-to-noise ratio of 95 dB with a wide pass band, outperforming prior art delta-sigma modulators.
Implementation Method 1
an operational amplifier and an integration capacitor with a switch-controlled digital-analog converter
Data Source
AI summary
An analog-digital delta-sigma converter includes a plurality of continuous time integrators for performing a delta-sigma modulation. Each integrator includes at least one charge sharing integrator at a modulator input. One or more pure integrators follow the charge sharing integrator.