Analog Switch Level Shifting for Wide-Range High-Voltage Signals
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Solution Overview
Problem
Modern electronic devices face excessive leakage currents and impedances when receiving extended voltage range analog signals, which existing circuits are unable to accommodate effectively.
Innovation Solution
An analog switch circuit with high voltage tolerance is implemented, featuring a first branch of series connected N-channel transistors and a second branch of series connected P-channel transistors coupled in parallel, along with a voltage generation circuit that uses level shifters to generate voltages based on the input signal, allowing the circuit to operate within the transistors' voltage ratings and maintain low impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the circuit receives extended voltage range analog signals beyond normal operating voltage ranges, then the voltage handling capability is improved, but leakage current and impedance increase excessively
Solution Approach 1:
The circuit is divided into multiple transistor branches (first branch with N-channel transistors, second branch with P-channel transistors) that can be independently controlled. This segmentation allows selective activation of appropriate branches based on input voltage levels, enabling the circuit to handle extended voltage ranges while maintaining low leakage current and impedance by keeping inactive branches in high-impedance state
Solution Approach 2:
The circuit employs dynamic control mechanisms including level shifters and control logic that adjust the operating state of transistor branches in real-time based on the input voltage signal. The control circuitry dynamically switches between different branches and adjusts biasing conditions to optimize performance across varying voltage ranges, preventing excessive leakage and impedance while accommodating extended voltage inputs
Data Source
AI summary
An analog switch circuit is provided. The circuit includes a branch coupled between an input terminal and an output terminal. The branch is configured to transfer an input signal at the input terminal to the output terminal when a control signal is at a first state. A transistor in the branch includes a current electrode coupled at the input terminal and is configured for receiving the input signal having a voltage exceeding a voltage rating of the transistor. A level shifter includes an output coupled to a control electrode of the transistor and is configured to provide a first voltage sufficient to cause the transistor to be conductive without exceeding the voltage rating of the first transistor when the control signal is at the first state. A voltage generator is coupled to the level shifter and is configured to generate the first voltage based on the input signal.