Programmable Charge-Transfer Summing Circuit for Multi-Channel Signals
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Solution Overview
Problem
Existing adding circuits for multi-channel signals face issues with large area occupation and interference in dynamic signal addition due to operational amplifiers and current mirrors, making them unsuitable for efficient multi-channel signal processing.
Innovation Solution
An adding circuit with charge and discharge circuits, a charge transfer circuit, and a switch sequence controlled by a control circuit to manage duty cycles, reducing interference and area requirements, suitable for both static and dynamic voltage addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If operational amplifiers and current mirror circuits are used for adding multi-channel signals, then the adding function is achieved, but the circuit occupies large area and dynamic signals are easily interfered
Solution Approach 1:
The patent extracts and removes the operational amplifiers and current mirror circuits from the adding circuit. Instead, it uses a purely resistive circuit configuration with voltage dividers and a summing amplifier that directly adds voltages through resistor networks, eliminating the need for complex active components that cause interference and occupy space.
Solution Approach 2:
The patent creates a simplified version of the adding function by copying only the essential voltage addition capability through resistor networks, rather than using the full operational amplifier and current mirror implementation. This copied function achieves the same purpose with reduced complexity and interference.
2Ease of manufacture
If operational amplifiers and current mirror circuits are used for adding multi-channel signals, then the adding function is achieved, but the circuit occupies large area
Solution Approach 1:
The patent extracts and removes the operational amplifiers and current mirror circuits from the adding circuit. Instead, it uses a purely resistive circuit configuration with voltage dividers and a summing amplifier that directly adds voltages through resistor networks, eliminating the need for complex active components that cause interference and occupy space.
Solution Approach 2:
The patent replaces expensive and complex operational amplifiers and current mirror circuits with simple, inexpensive resistive elements and basic voltage addition components. This substitution uses cheaper, simpler components that achieve the same function with reduced area and cost.
Data Source
AI summary
An adding circuit for multi-channel signals and an implementation method thereof are disclosed. The adding circuit for multi-channel signals includes an operational amplifier, a plurality of charge and discharge circuits, a charge transfer circuit, a switch sequence and a control circuit. In this disclosure, the duty cycle of each charge and discharge circuit and the charge transfer circuit can be programmed and preset according to the actual needs, which is not only suitable for the static voltage adding circuit, but also suitable for the dynamic voltage adding circuit. When there are multi-channel signals, the output interference caused by individual signals can be prevented. The area of the adding circuit can be greatly reduced. The adding circuit can be IP-based, controlled by programing and presetting a variety of combined adding algorithms, so the chip cost can be saved and a wide applicability in detection and monitoring can be provided.