Mode-Switching A/D Converter Using a Shared Amplifier
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Solution Overview
Problem
Existing A/D conversion devices face challenges in reducing power consumption and configuration area, particularly in hybrid modes where high-gain amplifiers are required to minimize gain errors, leading to increased current consumption and larger configurations.
Innovation Solution
An A/D conversion device that operates in ΔΣ, cyclic, and hybrid modes, using a first block with a single amplifier for all modes, eliminating the need for a high-gain second block amplifier, thereby reducing power consumption and configuration area by switching between modes to utilize the first block's amplifier for both ΔΣ and cyclic conversions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-gain second block amplifier is used to minimize gain errors in hybrid mode, then A/D conversion accuracy is improved, but current consumption and configuration area increase
Solution Approach 1:
The first block amplifier is designed to perform multiple functions: it serves as the main amplifier for ΔΣ mode processing and also handles cyclic mode processing. By making the first block amplifier universal, the patent eliminates the need for a separate second block amplifier, thereby reducing current consumption and configuration area while maintaining A/D conversion accuracy through proper mode switching
2Measurement precision
If a high-gain second block amplifier is used to minimize gain errors in hybrid mode, then A/D conversion accuracy is improved, but configuration area increases
Solution Approach 1:
The first block amplifier is designed to perform multiple functions: it serves as the main amplifier for ΔΣ mode processing and also handles cyclic mode processing. By making the first block amplifier universal, the patent eliminates the need for a separate second block amplifier, thereby reducing configuration area while maintaining A/D conversion accuracy through proper mode switching
3Adaptability or versatility
If separate amplifiers are provided for different conversion modes, then mode-specific performance is optimized, but device complexity increases
Solution Approach 1:
The first block amplifier is designed to perform multiple functions: it serves as the main amplifier for ΔΣ mode processing and also handles cyclic mode processing. By making the first block amplifier universal, the patent reduces device complexity while maintaining adaptability through a control circuit that switches between operating modes based on the selected conversion mode
Solution Approach 2:
The patent implements dynamic mode switching where the control circuit adjusts the operating mode of the first block amplifier based on the selected conversion mode (ΔΣ, cyclic, or hybrid). This dynamic adaptation allows the system to optimize performance for each mode without requiring separate dedicated amplifiers, thereby reducing overall device complexity
Data Source
AI summary
An A/D conversion device, which operates in one mode including at least one of a ΔΣ mode, a cyclic mode, and a hybrid mode, includes: a first block that processes an analog input signal by a first amplifier; a second block including a second amplifier; a quantization unit that quantizes one of outputs of the first and second blocks; and a control circuit that switches the mode to perform a control corresponding to the mode.