Multiplexed Readout Circuit for Low-Power Signal Quantization
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Solution Overview
Problem
The existing readout circuits for analog signals face challenges in reducing power consumption, leading to increased costs and performance limitations, particularly due to complex circuit structures and noise interference.
Innovation Solution
A readout circuit design that includes a multiplex signal processor for multiple channels, utilizing a flip-flop-capacitor-type signal processor with a gain-boost folded co-source co-gate structure, and a randomizing circuit to randomize the order of sampling capacitors, which reduces power consumption and simplifies the circuit structure while improving signal processing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex circuit structure is used to improve signal processing accuracy, then measurement precision is improved, but device complexity increases and power consumption increases
Solution Approach 1:
The readout circuit is divided into multiple independent channels, each with its own integrator and shared signal processor. This segmentation allows parallel signal processing while maintaining modular complexity, improving signal processing accuracy without proportionally increasing overall device complexity.
Solution Approach 2:
The signal processor is designed as a universal component that can process signals from multiple channels sequentially. By making the signal processor multi-functional and shareable across channels, the circuit achieves high measurement precision without requiring dedicated complex processing circuits for each channel, thus controlling device complexity.
2Measurement precision
If a complex circuit structure is used to improve signal processing accuracy, then measurement precision is improved, but power consumption increases
Solution Approach 1:
Multiple channels share common components including the signal processor, sampling capacitors, and resetting capacitors. By merging these components across channels, the total power consumption is reduced compared to having dedicated components for each channel, while still maintaining high signal processing accuracy through sequential processing.
Solution Approach 2:
The signal processor processes signals from different channels in a periodic sequential manner rather than simultaneously. This periodic action allows the use of lower power components while maintaining processing accuracy, as the processor can be optimized for precision rather than speed, and idle components consume minimal power.
3Use of energy by moving object
If power consumption is reduced by simplifying the circuit structure, then power consumption decreases, but device complexity may increase due to multiplexing
Solution Approach 1:
The signal processor is designed as a universal component that sequentially processes signals from multiple channels. This multi-functionality reduces the total number of processors needed, lowering power consumption while the sequential multiplexing approach keeps the control logic relatively simple compared to parallel processing architectures.
Solution Approach 2:
Integrators perform preliminary integration of signals from multiple channels before they reach the shared signal processor. This preliminary action prepares the signals in advance, allowing the shared processor to work more efficiently with reduced complexity, as the heavy integration work is already done by the distributed integrators.
Data Source
AI summary
Disclosed are a readout circuit, a signal quantizing method, a signal quantizing device, and a computer device. The readout circuit includes: a signal sampler, including a plurality of channels; a plurality of integrators, connected to the plurality of channels and having a one-to-one relationship with the plurality of channels; a signal processor, including a first operational amplifier, a sampling input of the first operational amplifier being connected to outputs of the plurality of integrators, respectively; and an analog-digital converter. An input of the analog-digital converter is connected to an output of the first operational amplifier.