Voltage Adjust Circuit With Cross-Voltage Suppression for Wide Swing Output
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Solution Overview
Problem
Existing voltage adjust circuits face challenges in converting low voltage swing signals to high voltage swing signals and expanding the output voltage domain, which is crucial for operating circuits effectively in electric devices.
Innovation Solution
A voltage adjust circuit comprising a buffer circuit with pull-up and pull-down transistors, a level shifter, a bias circuit, and a cross-voltage-suppression circuit, which generates control signals to switch the output voltage between system high and low voltage levels, effectively suppressing transient and static voltage stress through dynamic bias voltages and static bias voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional voltage adjust circuits are used to convert low voltage swing signals to high voltage swing signals, then the voltage operation range is limited, but the circuit cannot provide sufficient voltage domain for external circuits
Solution Approach 1:
The voltage adjust circuit is divided into multiple stages including a buffer circuit with multiple pull-up transistors and pull-down transistors, a level shifter, a bias circuit, and a cross-voltage-suppression circuit. Each stage handles a specific portion of the voltage conversion process, enabling the circuit to achieve both extended voltage range and reliable voltage supply capability through coordinated operation of segmented functional blocks
2Adaptability or versatility
If the output voltage level is switched between system high voltage terminal and system low voltage terminal, then the voltage domain is expanded, but transient and static voltage stress occurs between two terminals of the transistors
Solution Approach 1:
The cross-voltage-suppression circuit proactively counteracts voltage stress before it can cause damage. When the output voltage level switches between high and low states, the cross-voltage-suppression circuit detects potential voltage stress conditions and applies counteracting control signals to the pull-up and pull-down transistors, preventing excessive voltage differential from occurring at any transistor terminals
Solution Approach 2:
The bias circuit acts as an intermediary between the level shifter and the buffer circuit, mediating the voltage transitions. It generates appropriate bias voltages that smooth the switching process and reduce abrupt voltage changes, thereby minimizing transient voltage stress while still enabling the full voltage domain expansion
3Quantity of substance
If low voltage swing signals are input, then the circuit operates within a limited domain, but the external circuit requires a larger voltage domain
Solution Approach 1:
The level shifter transforms the input signal by introducing a voltage offset dimension. It takes the low voltage swing signal and shifts it to a higher voltage level, effectively adding a voltage dimension to the signal. This allows the output to achieve large voltage swing amplitude while maintaining compatibility with external circuits that require larger voltage domains
Data Source
AI summary
The disclosure provides a voltage adjust circuit. The voltage adjust circuit includes a buffer circuit, a bias circuit, a level shifter and a cross voltage limit circuit. The buffer circuit includes a plurality of pull-up transistors and a plurality of pull-down transistors. The pull-up transistors coupled in series between an output terminal of the circuit and a high voltage system terminal. The pull-down transistors coupled in series between the output terminal and a low voltage system terminal. The cross voltage limit circuit is configured to limit transient and static bias voltages across two terminals of the pull-up transistors or the pull-down transistors.