Voltage Regulator with Segmented Stages for Fast Current Transients
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Solution Overview
Problem
Voltage regulators struggle to maintain stable output voltage during rapid changes in current demand in integrated circuit applications, as existing technologies fail to effectively handle wide swings in load current without external signaling.
Innovation Solution
A system of circuits that inject pre-determined currents into and out of a regulated voltage node, using voltage monitors to detect droop and overshoot, and engage subsequent regulator stages for power savings, allowing for fast response to current demand changes without external signaling, comprising a reference current scaling circuit and a decision-making circuit with comparators and transfer gates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional voltage regulators are used, then the circuit is simple and power consumption is low, but the regulator cannot respond quickly to rapid changes in current demand
Solution Approach 1:
The voltage regulator is divided into multiple independent stages, each capable of operating autonomously. The first stage handles large current transients quickly, while subsequent stages provide fine regulation. This segmentation allows the system to achieve fast response without requiring a single complex regulator to handle all conditions.
Solution Approach 2:
The regulator employs dynamic switching between different operational modes and stages based on real-time voltage conditions. The decision-making circuit dynamically enables or disables subsequent stages based on voltage droop or overshoot detection, allowing the system to adapt its complexity to the actual operating conditions.
2Reliability
If multiple regulator stages are always engaged, then voltage regulation is tight and stable, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the number of active regulator stages based on real-time voltage conditions. The decision-making circuit monitors voltage droop or overshoot and selectively enables subsequent stages only when needed, reducing power consumption during normal operation while maintaining regulation stability when transients occur.
Solution Approach 2:
The voltage regulator system monitors its own output voltage and automatically activates additional stages when voltage droop or overshoot is detected, without requiring external control signals. This self-service mechanism ensures reliable voltage regulation while minimizing power consumption by keeping stages disabled during normal operation.
3Reliability
If the regulator responds quickly to current changes, then voltage stability is maintained, but the circuit requires external signaling which increases complexity
Solution Approach 1:
The voltage regulator system monitors its own output voltage and automatically activates additional stages when voltage droop or overshoot is detected, without requiring external control signals. This self-service mechanism ensures reliable voltage regulation while minimizing power consumption by keeping stages disabled during normal operation.
Solution Approach 2:
The decision-making circuit uses feedback from voltage monitoring to automatically control the activation of subsequent regulator stages. When voltage droop or overshoot is detected, the feedback signal triggers the appropriate stages to activate, providing quick response to transients without requiring external signaling.
Data Source
AI summary
A voltage regulator includes a reference current scaling circuit comprising an input reference current, a scaled output source current and a corresponding first bias voltage, and a scaled output sink current and a corresponding second bias voltage; and a decision making circuit having a first voltage input for receiving a first reference voltage, a second voltage input for receiving a second reference voltage, a third voltage input for receiving the first bias voltage, and a fourth voltage input for receiving the second bias voltage, and an output for providing a regulated voltage.