Multi-Voltage Buffer Circuit with Selective Current Mirrors
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Solution Overview
Problem
Existing buffer circuits in electronic devices require multiple components to support various power source voltages, increasing complexity and component count, whereas a single buffer capable of supporting multiple power sources is needed to simplify the design and reduce component requirements.
Innovation Solution
A buffer circuit incorporating a current mirror circuit and a differential pair that can selectively form current mirrors corresponding to different power source voltages, allowing a single buffer to amplify differential signals for both first and second power source voltages, eliminating the need for multiple buffers and selectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple buffers are used to support various power source voltages, then the buffer circuit can interface with different power sources, but the device complexity and component count increase
Solution Approach 1:
The patent implements a single buffer circuit that can operate with multiple power source voltages (e.g., 1.2V, 1.8V, 3.3V) by incorporating voltage selection logic and multiple power input terminals. The buffer selectively activates different internal paths based on the detected power source voltage, allowing one buffer to perform the function of what would traditionally require multiple separate buffers, thereby reducing device complexity while maintaining adaptability
Solution Approach 2:
The buffer circuit dynamically adjusts its operating parameters and internal connections based on the detected power source voltage. The circuit includes voltage detection mechanisms that automatically configure the buffer's internal transistor networks and current mirrors to match the appropriate voltage level, enabling seamless adaptation without manual intervention or fixed configuration
2Adaptability or versatility
If multiple buffers are used to support various power source voltages, then the buffer circuit can interface with different power sources, but the number of components increases
Solution Approach 1:
The patent merges the functionality of multiple voltage-specific buffers into a single integrated buffer circuit. By combining multiple power input terminals (VCC1, VCC2, VCC3), shared differential pair structures, and integrated voltage selection logic, the design reduces the total component count while maintaining the ability to interface with different power sources. The current mirror circuits and transistor networks are shared across different voltage domains through selective activation
3Device complexity
If a single buffer is designed to support multiple power source voltages, then the device complexity is reduced, but the buffer must handle multiple voltage levels simultaneously
Solution Approach 1:
The buffer circuit is segmented into multiple voltage domain sections, each optimized for specific voltage levels. The circuit includes separate current mirror networks and transistor paths for different voltage domains (e.g., 1.2V domain, 1.8V domain, 3.3V domain), which are selectively activated based on the power source voltage. This segmentation allows the single buffer to handle multiple voltage levels without interference while maintaining low complexity through modular organization
Data Source
AI summary
A buffer circuit may include: a current mirror circuit suitable for selectively forming a first current mirror corresponding to a first power source voltage, and a second current mirror corresponding to a second power source voltage; and a differential pair coupled to the current mirror circuit, and suitable for forming a current path with the first current mirror or the second current mirror, amplifying a differential signal corresponding to a difference between a reference voltage and input data received through an input terminal, and outputting the amplified differential signal to an output terminal as a buffer output signal.