DC-Cut High-Speed Feedback Loop for Voltage Stability
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Solution Overview
Problem
In semiconductor integrated circuits, it is challenging to stabilize output voltage due to high-speed variations in output current, leading to voltage fluctuations beyond acceptable ranges, especially when the load circuit operates at high clock frequencies, and existing feedback control mechanisms increase power consumption to enhance responsiveness.
Innovation Solution
The introduction of a DC-cut high-speed feedback loop within the regulator circuit, utilizing comparators and coupling capacitive elements, allows for selective and rapid response to voltage fluctuations, suppressing overshooting and undershooting variations without increasing current consumption by using auxiliary transistors and bias generation circuits to maintain low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control mechanisms are enhanced to improve responsiveness to voltage fluctuations, then output voltage stability is improved, but power consumption increases
Solution Approach 1:
The feedback control system is segmented into two independent loops: a conventional DC feedback loop for steady-state voltage regulation and a newly introduced AC feedback loop for high-speed transient response. The AC loop uses a comparator instead of an error amplifier and includes a coupling capacitance to block DC components, allowing it to respond rapidly to voltage fluctuations without affecting the overall power consumption of the DC control system.
Solution Approach 2:
A coupling capacitance is introduced as an intermediary element in the AC feedback loop to selectively transmit AC voltage fluctuation signals while blocking DC components. This mediator allows the AC feedback loop to operate independently for high-speed transient suppression without interfering with the DC feedback loop's power consumption characteristics.
2Reliability
If conventional feedback control is used to suppress voltage variations, then output voltage stability is improved, but response speed to high-speed current variations deteriorates
Solution Approach 1:
The feedback control system is divided into two functional segments: a DC feedback loop using an error amplifier for steady-state regulation, and an AC feedback loop using a comparator for high-speed transient response. Each segment handles specific frequency ranges, allowing the AC loop to respond rapidly to high-speed current variations without being limited by the bandwidth constraints of the DC error amplifier.
Solution Approach 2:
The AC feedback loop changes the operating parameters by using a comparator instead of an error amplifier, enabling much faster response speeds for detecting and correcting voltage fluctuations caused by high-speed current variations in the load circuit.
3Use of energy by moving object
If DC feedback control is used for voltage stabilization, then power consumption is reduced, but ability to respond to high-speed voltage fluctuations deteriorates
Solution Approach 1:
The control system is segmented into DC and AC feedback loops with distinct functions. The DC loop maintains low power consumption for steady-state operation, while the AC loop provides high-speed response to voltage fluctuations without significantly increasing overall power consumption, as it only activates during transient conditions.
Solution Approach 2:
The AC feedback loop operates periodically during transient voltage fluctuations rather than continuously, allowing rapid response to high-speed current variations only when needed. This periodic activation maintains low average power consumption while providing high-speed response capability during critical transient periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively stabilizes output voltage within acceptable ranges during high-speed current variations, reducing power consumption and enabling efficient operation of high-speed load circuits while maintaining low power consumption.
Implementation Method 1
One end of a coupling capacitance is electrically connected to an output terminal of the comparator. A gate of the auxiliary transistor is electrically connected to the other end of the coupling capacitance.
Data Source
AI summary
According to one embodiment, in a semiconductor integrated circuit, a first input terminal of an error amplifier is electrically connected to a third node between a second node and a reference potential. A second input terminal of the error amplifier is electrically connected to a reference voltage. An output terminal of the error amplifier is electrically connected to a gate of an output transistor. A first input terminal of a comparator is electrically connected to a fourth node between the second node and the reference potential. A second input terminal of the comparator is electrically connected to the reference voltage. One end of a coupling capacitance is electrically connected to an output terminal of the comparator. A gate of an auxiliary transistor is electrically connected to the other end of the coupling capacitance. A drain of the auxiliary transistor is electrically connected to the second node.