Bandgap Reference Startup Circuit With Feedback Shutoff
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Solution Overview
Problem
Conventional startup circuits for bandgap reference circuits consume excessive power as they continue to provide a startup signal for an unnecessarily long duration, even after the bandgap reference circuit reaches its stable operating state, due to their design that does not account for the internal evolution of the circuit towards the on-state without maintaining the startup signal.
Innovation Solution
A smart startup circuit that provides a startup signal until a specific startup condition is detected, indicated by a feedback signal, allowing the bandgap reference circuit to evolve into the stable on-state without continuous power consumption, by either increasing or stopping the startup voltage based on the feedback voltage's comparison with a target voltage value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the startup circuit continues to provide a startup signal for a long duration to ensure the bandgap reference circuit reaches its stable operating state, then the reliability of the startup process is improved, but the power consumption increases excessively
Solution Approach 1:
The patent implements a feedback mechanism where the startup circuit monitors the output voltage of the bandgap reference circuit and automatically adjusts the duration of the startup signal based on the actual startup progress. When the output voltage reaches a predetermined threshold, the feedback signal automatically terminates the startup signal, preventing unnecessary continued operation and reducing power consumption while ensuring reliable startup.
Solution Approach 2:
The patent introduces dynamic control of the startup signal duration, transitioning from a static fixed-duration approach to a dynamic adaptive approach. The startup circuit dynamically adjusts the signal duration based on real-time monitoring of the bandgap reference circuit's startup state, optimizing the balance between startup reliability and power consumption by extending the signal only as long as necessary.
2Stability of the object's composition
If the startup signal is provided continuously to maintain the bandgap reference circuit in the on-state, then the stability of the operating state is improved, but the power consumption increases unnecessarily
Solution Approach 1:
The patent extracts and removes the unnecessary continuous startup signal once the bandgap reference circuit has successfully reached its stable operating state. The feedback mechanism detects when startup is complete and automatically disconnects the startup signal, eliminating the energy waste associated with maintaining a signal that is no longer needed for stability.
Solution Approach 2:
The patent discards the startup signal after it has served its purpose of initiating the startup process. Once the bandgap reference circuit reaches its stable operating state, the startup signal is terminated and its power supply is recovered or reallocated, preventing continuous energy consumption from an obsolete control signal.
Data Source
AI summary
Various aspects relate to a startup circuit for a bandgap reference circuit, wherein a target voltage value is associated with the bandgap reference circuit, the target voltage value being indicative of a startup condition of the bandgap reference circuit that triggers a stable on-state of the bandgap reference circuit, wherein the startup circuit is configured to: provide a startup voltage at the bandgap reference circuit to trigger a start of an operation of the bandgap reference circuit; receive a feedback voltage, wherein the feedback voltage is representative of a startup condition of the bandgap reference circuit; and either increase the startup voltage at the bandgap reference circuit in the case that a voltage value of the feedback voltage is less than the target voltage value, or stop providing the startup voltage at the bandgap reference circuit in the case that the voltage value of the feedback voltage is equal to or greater than the target voltage value.