Regulator-Free Output Stage Circuit for Stable Adjustable Voltage
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Solution Overview
Problem
Conventional output stage circuits require additional regulators to achieve different voltage levels, increasing complexity and circuit space, which is inefficient.
Innovation Solution
An output stage circuit design that includes a current source circuit, bias circuit, and output circuit with transistors and load circuits, allowing for adjustable voltage levels without a regulator, using a replica bias circuit to maintain stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a regulator is added to change voltage levels in a conventional output stage circuit, then the output voltage level can be adjusted, but the circuit complexity and circuit space increase greatly
Solution Approach 1:
The patent removes the regulator component from the output stage circuit entirely. Instead of using a traditional regulator to adjust voltage levels, the invention extracts this function by using a current source circuit coupled with a bias circuit and transistor-based output stage that can directly provide adjustable output voltage levels without requiring an additional regulator, thereby reducing circuit complexity while maintaining voltage adjustment capability
Solution Approach 2:
The current source circuit and bias circuit combination serves multiple functions: it provides current driving capability, enables voltage level adjustment, and maintains output stability simultaneously. This multi-functional design eliminates the need for separate regulator components, allowing the circuit to achieve voltage level adaptation without increasing overall complexity
2Adaptability or versatility
If a regulator is added to change voltage levels in a conventional output stage circuit, then the output voltage level can be adjusted, but the circuit space occupied increases
Solution Approach 1:
By removing the regulator component from the circuit architecture, the patent eliminates the physical space that would be required for the regulator. The voltage adjustment function is achieved through the existing current source and transistor configuration, which occupies less space than a dedicated regulator would require
Solution Approach 2:
The patent merges the voltage adjustment function into the existing output stage circuitry by integrating the current source circuit and bias circuit with the transistor network. This consolidation allows voltage level adaptation to be achieved within the same circuit footprint without adding separate regulator components that would increase overall circuit space
3Device complexity
If a regulator-free design is used to reduce complexity, then circuit simplicity is improved, but maintaining stable output voltage at different levels becomes challenging
Solution Approach 1:
The bias circuit in the patent employs feedback mechanisms to maintain stable output voltage levels. The bias circuit receives feedback from the output stage and adjusts the current source accordingly to compensate for variations, ensuring that the output voltage remains stable at different voltage levels without requiring a complex regulator
Solution Approach 2:
The patent utilizes parameter changes in the current source circuit and transistor operating points to achieve stable voltage output. By dynamically adjusting current parameters and bias voltages based on the desired output level, the circuit maintains voltage stability across different operating conditions while keeping the overall design simple and regulator-free
Data Source
AI summary
An output stage circuit including a current source circuit, a bias circuit, and an output circuit is provided. The bias circuit is coupled between the current source circuit and a ground terminal voltage. The output circuit includes a first transistor, a second transistor, a third transistor, and a load circuit. A control terminal of the first transistor is coupled to the bias circuit. The load circuit is coupled to a second terminal of the first transistor. A second terminal of the second transistor is coupled to a first terminal of the first transistor. A first terminal of the third transistor is coupled to the second terminal of the first transistor.