Bandgap Reference Feedback Topology for Adjustable Output Voltage
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Solution Overview
Problem
Existing bandgap voltage reference circuits face challenges in reducing cost and increasing flexibility while effectively addressing input voltage, temperature, and loading variance.
Innovation Solution
The proposed solution involves a bandgap voltage reference circuit topology that includes a VBG core, a trim circuit, and a feedback circuit with a scaling amplifier, allowing for adjustable output voltage reference values by bypassing or using the scaling amplifier, thereby providing a cost-effective and flexible solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a feedback circuit with a scaling amplifier is added to the bandgap voltage reference circuit, then the adaptability and flexibility of the circuit are improved, but the device complexity increases
Solution Approach 1:
The feedback circuit with the scaling amplifier is designed to perform multiple functions: it can scale the output voltage reference values to different levels (e.g., 1.25V, 2.5V, 5V) and can operate in different modes (feedback enabled or bypassed) depending on the application requirements. This multi-functional design allows a single circuit topology to serve multiple voltage reference needs without requiring separate dedicated circuits for each voltage level.
Solution Approach 2:
The circuit incorporates dynamic control through the feedback mechanism where the scaling amplifier can be selectively enabled or bypassed based on operational requirements. The feedback circuit dynamically adjusts the output voltage reference values by scaling them according to the desired output level, allowing the circuit to adapt its behavior rather than being fixed at a single operating point.
2Adaptability or versatility
If the feedback circuit with scaling amplifier is used to provide adjustable output voltage reference values, then the versatility of the circuit is improved, but the manufacturing cost increases
Solution Approach 1:
The feedback circuit with scaling amplifier serves as a universal solution that can generate multiple standard voltage reference values (1.25V, 2.5V, 5V, etc.) from a single bandgap core. This eliminates the need to manufacture separate dedicated voltage reference circuits for each voltage level, thereby reducing overall manufacturing costs despite the added complexity of the feedback circuitry.
Solution Approach 2:
The patent combines the bandgap voltage reference core with the feedback circuit and scaling amplifier into an integrated solution. By merging these functions into a single integrated circuit, the patent achieves cost-effective manufacturing through integration, reducing the need for multiple discrete components and simplifying the manufacturing process despite the enhanced functionality.
Data Source
AI summary
A bandgap voltage reference circuit includes: a bandgap voltage reference (VBG) core having a power input and first and second terminals; a bandgap operational amplifier (BGOA) having an operational amplifier output and first and second terminals, the first terminal of the BGOA coupled to the first terminal of the VBG core, and the second terminal of the BGOA coupled to the second terminal of the VBG core; and a feedback circuit having a feedback input and a feedback output, the feedback input coupled to the operational amplifier output, and the feedback output coupled to the power input. The feedback circuit includes a scaling amplifier having an inverting input, a non-inverting input, and a scaling amplifier output.