Bandgap Reference Circuit With Mode Switching for Stable Voltage
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Solution Overview
Problem
Existing bandgap reference circuits experience significant fluctuations in reference voltage due to temperature, power supply, and loading changes, occupying substantial area on integrated circuits and requiring long start-up times.
Innovation Solution
A bandgap reference system comprising a first bandgap reference circuit, a low dropout regulator, a temperature circuit, and a second bandgap reference circuit, where the second bandgap reference circuit configures impedance elements based on temperature signals to provide a more stable reference voltage, with the low dropout regulator and temperature circuit aiding in voltage regulation and temperature sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing bandgap reference circuits are used, then reference voltage is provided, but reference voltage fluctuates significantly due to temperature, power supply, and loading changes
Solution Approach 1:
The patent implements automatic temperature compensation by dynamically adjusting circuit parameters based on detected temperature conditions. The temperature compensation circuit modifies the bandgap reference voltage in real-time according to temperature variations, transforming a static reference circuit into a dynamic one that adapts to environmental changes and maintains voltage stability.
Solution Approach 2:
The patent employs feedback mechanisms where the temperature compensation circuit continuously monitors temperature conditions and adjusts the bandgap reference voltage accordingly. This closed-loop feedback system detects deviations caused by temperature, power supply, or loading changes and automatically corrects them, significantly improving reference voltage stability against harmful external factors.
2Reliability
If existing bandgap reference circuits are used, then reference voltage is generated, but substantial area is occupied on integrated circuit die
Solution Approach 1:
The patent combines multiple functions into a single integrated bandgap reference circuit that simultaneously provides reference voltage generation, temperature compensation, and power supply rejection. By merging these previously separate circuits into one compact design, the patent reduces the overall area occupied on the integrated circuit die while maintaining all necessary functions.
Solution Approach 2:
The patent designs a universal bandgap reference circuit that performs multiple functions: generating stable reference voltage, compensating for temperature variations, and rejecting power supply noise. This multi-functional approach eliminates the need for separate dedicated circuits for each function, thereby reducing total die area while providing comprehensive reference voltage stability.
3Reliability
If existing bandgap reference circuits are used, then reference voltage is provided, but relatively long start-up time is required
Solution Approach 1:
The patent implements preliminary action by pre-charging capacitor nodes and establishing bias conditions before the bandgap reference circuit begins normal operation. The start-up circuit proactively prepares the circuit state in advance, eliminating delays associated with gradual charging and stabilization, thereby significantly reducing start-up time while ensuring reliable reference voltage provision.
Solution Approach 2:
The patent employs rushing techniques by using active start-up circuits that force rapid charging of integrating capacitors and quick establishment of operating points. Instead of allowing gradual natural charging, the circuit actively drives the nodes to their final values quickly, skipping through the slow startup phase and achieving stable reference voltage much faster.
Data Source
AI summary
Circuits, systems, and methods to automatically switch modes to provide constant reference voltages are discussed herein. For example, a bandgap reference system may include a first bandgap reference circuit configured to provide a first bandgap reference voltage, a low dropout regulator coupled to the first bandgap reference circuit, a temperature circuit coupled to the low dropout regulator, and a second bandgap reference circuit coupled to the low dropout regulator and the temperature circuit. The second bandgap reference circuit may be configured to configure one or more impedance elements based at least in part on a temperature signal and provide a second bandgap reference voltage based on one or more currents that pass through the one or more impedance elements.