Feedback Comparator Circuit With Rail-to-Rail Input Amplification
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Solution Overview
Problem
The power consumption of semiconductor integrated circuits increases with the number of comparators included, which is a challenge in designing efficient comparator circuits for applications such as analog-to-digital converters and IoT devices.
Innovation Solution
A comparator circuit is designed with an input circuit, first and second inverting amplification circuits, coupling circuits, and a feedback circuit that alternately selects positive and negative input voltages during equalizing and sampling periods, reducing operation current by amplifying input nodes with rail-to-rail voltage using the feedback circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of comparators is increased to improve resolution in analog-to-digital converters, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent changes the operating voltage parameters by implementing rail-to-rail voltage amplification at the input node, allowing the comparator to operate efficiently across the full voltage range while reducing power consumption. This parameter change enables the comparator to achieve high resolution without proportionally increasing power consumption
Solution Approach 2:
The patent introduces a feedback circuit that feeds back the output signal to the input node through a feedback network. This feedback mechanism enables the comparator to maintain high precision through multiple amplification stages while managing power consumption through intelligent signal routing and regeneration
2Use of energy by moving object
If rail-to-rail voltage amplification is applied at the input node using feedback circuit, then operation current is reduced, but device complexity increases
Solution Approach 1:
The feedback network serves multiple functions simultaneously: it provides voltage amplification, enables rail-to-rail operation, and reduces operation current. By making the feedback circuit multi-functional, the patent reduces overall device complexity despite adding feedback components
Solution Approach 2:
The patent merges the voltage amplification function and current reduction function into a single feedback circuit structure. By combining these functions that could have been implemented as separate circuits, the overall device complexity is minimized while achieving the desired power consumption reduction
Data Source
AI summary
A comparator circuit, including an input circuit, first and second inverting amplification circuits, first and second coupling circuits, and a feedback circuit, wherein the input circuit generates an amplified input signal based on positive and negative input voltages, the first inverting amplification circuit generates an intermediate amplified signal based on the amplified input signal during a sampling period, the second inverting amplification circuit generates a comparison result signal based on the intermediate amplified signal during the sampling period, the first coupling circuit is connected between the input circuit and the first inverting amplification circuit, the second coupling circuit is connected between the first inverting amplification circuit and the second inverting amplification circuit, and the feedback circuit amplifies the input node of the first inverting amplification circuit with a rail-to-rail voltage corresponding to a power supply voltage or a ground voltage based on the comparison result signal during the sampling period.