Dual-Loop Low Voltage Regulator for Fast, Stable IC Supply
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Solution Overview
Problem
Integrated circuits with small process nodes, such as those equal to or less than 10 nanometers, face challenges in regulating low voltages effectively due to sensitivity to voltage variations, requiring enhanced voltage regulation to ensure reliable operation of multigate transistors.
Innovation Solution
A dual-loop voltage regulation system is implemented, comprising a 'high gain slow' loop for low frequency domain regulation and a 'low gain fast' loop for high frequency domain regulation, using a differential opamp with a high gain and a self-bias circuit to provide a stable output voltage across a range of 0.8 to 1.2 volts, with a resistor ladder and capacitors for feedback and dampening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voltage regulation loop is used, then the device complexity is reduced, but the ability to provide clean voltage across wide frequency range deteriorates
Solution Approach 1:
The voltage regulation system is segmented into two independent control loops: a first control loop optimized for low-frequency regulation and a second control loop optimized for high-frequency regulation. Each loop has its own error amplifier and feedback path, allowing independent optimization of regulation performance across different frequency domains without requiring a single complex loop design.
2Use of energy by moving object
If multigate transistors operate at low voltages, then power consumption is reduced, but voltage regulation difficulty increases
Solution Approach 1:
The regulation system is divided into two loops with different gain and bandwidth characteristics. The first loop provides high gain for low-frequency regulation to maintain precision at low voltages, while the second loop provides fast response for high-frequency transient suppression. This segmentation allows effective low-voltage regulation without requiring excessive complexity in a single loop.
3Measurement precision
If high gain is used in voltage regulation, then regulation precision is improved, but response speed deteriorates
Solution Approach 1:
The system separates precision regulation and fast response functions into two distinct loops. The first loop uses high gain error amplifiers optimized for precision low-frequency regulation, while the second loop uses lower gain amplifiers with higher bandwidth optimized for fast transient response. This eliminates the trade-off by assigning different optimization goals to separate loops.
Solution Approach 2:
The solution moves from a single-dimensional optimization (trying to maximize both gain and bandwidth in one loop) to a two-dimensional approach by adding a second control loop. This allows independent optimization of gain and bandwidth across different frequency dimensions, achieving both precision and speed simultaneously through dimensional expansion of the control architecture.
Data Source
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AI summary
Apparatus and method relating to voltage regulation is disclosed. In an apparatus thereof, an integrated circuit (100, 200) includes a first differential opamp (120) having a first gain. The first differential opamp is configured to receive a reference voltage (106) and a feedback voltage (141). A second differential opamp (110) has a second gain less than the first gain. The second differential opamp is configured to receive the reference voltage and the feedback voltage. A driver transistor (104) is configured to provide an output voltage (150) at an output voltage node (140) and to receive a gating voltage (148) output from the second differential opamp. A differential output (121) of the first differential opamp is configured for gating a current source transistor (115) of the second differential opamp. A capacitor (135) is connected to the driver transistor and the current source transistor.