Analog Voltage Selector Circuit With Adjustable Transfer Function
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Solution Overview
Problem
Conventional minimum or maximum voltage detecting circuits in analog control systems have inflexible transfer functions, leading to increased complexity and cost, and suffer from long transition times, which can result in voltage errors and degraded system performance.
Innovation Solution
The proposed circuit design includes multiple input sub-circuits with transconductance cells, diodes, and voltage followers, allowing for adjustable transfer functions and low transition times through the use of feedback circuits and diodes to select the minimum or maximum voltage, enabling efficient switching between output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional minimum or maximum voltage detecting circuits are used, then the circuit structure is simple, but the transfer function cannot be easily altered, increasing complexity and cost for different transfer functions
Solution Approach 1:
The patent implements a universal selector circuit architecture where the same basic circuit structure can perform multiple different transfer functions by simply changing the feedback network configuration. The operational amplifier-based selector circuit can be configured for different voltage selection functions (minimum, maximum, or custom transfer functions) without requiring complete circuit redesign, thus achieving multi-functionality with a single versatile platform
Solution Approach 2:
The patent employs dynamic feedback networks that can be reconfigured to change the transfer function characteristics. By using switches and controllable components in the feedback path, the circuit can dynamically adapt its transfer function based on operating conditions, allowing flexible adjustment between different voltage selection modes without physical circuit changes
2Speed
If conventional selector circuits are used, then the circuit design is straightforward, but the transition time between voltage outputs is long, causing voltage errors and degraded performance
Solution Approach 1:
The patent implements preliminary action by pre-charging and pre-discharging capacitive elements in the feedback network before the actual voltage switching occurs. This preparatory action reduces the time required for voltage transitions and minimizes transient errors, allowing the circuit to switch between voltage levels more rapidly and accurately
Solution Approach 2:
The patent employs negative feedback mechanisms that actively monitor the output voltage and adjust the switching timing to minimize transition errors. The feedback network detects voltage deviations during transitions and compensates in real-time, reducing voltage errors and improving the reliability of the voltage selection process while maintaining fast switching speeds
Data Source
AI summary
A circuit includes multiple input sub-circuits coupled to a common output node. Each input sub-circuit includes a transconductance cell. A diode is coupled between the output of the transconductance cell and a common output node. A feedback circuit is coupled between the common output node and a second input of the transconductance cell. A voltage follower is coupled between the common output node and a reference voltage, with an input coupled to the output of the transconductance cell.