Low Power Regulator Circuitry With Segmented Transistors
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Solution Overview
Problem
Voltage regulators face high power consumption when driving large capacitive loads, leading to increased self-consumption current due to larger transistor sizes.
Innovation Solution
The regulator circuitry includes a configuration with multiple transistors of different conductivity types and level shifting circuitry, where the gate widths of primary transistors are reduced by utilizing secondary transistors to manage output voltage deviations, thereby suppressing self-consumption current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the transistor size is increased to drive large capacitive loads, then the load driving capability is improved, but the self-consumption current increases
Solution Approach 1:
The patent divides the single transistor into multiple transistors (first output transistor, second output transistor, third output transistor) with different conductivity types. These segmented transistors work in coordination, where the first and third transistors have reduced gate widths to minimize self-consumption current, while the second transistor compensates to maintain load driving capability. This segmentation resolves the contradiction by distributing functions across multiple smaller components.
Solution Approach 2:
Different transistors are assigned different gate widths based on their specific functions. The first and third transistors have reduced gate widths optimized for low self-consumption current, while the second transistor has appropriate gate width for load driving. This local differentiation of transistor properties allows simultaneous optimization of both power consumption and driving capability.
2Reliability
If the gate width of primary transistors is increased to maintain output voltage stability, then the voltage regulation accuracy is improved, but the current consumption increases
Solution Approach 1:
The patent segments the voltage regulation function across multiple transistors with different gate widths. The first output transistor has reduced gate width for low current consumption, while the second output transistor compensates to maintain voltage stability. This segmentation allows each transistor to be optimized for its specific role, resolving the contradiction between stability and power consumption.
Solution Approach 2:
The control transistor acts as an intermediary that coordinates the operation of the first, second, and third output transistors. It manages the gate voltages to ensure that the reduced-gate-width transistors still achieve adequate voltage regulation performance while minimizing overall current consumption. The intermediary control mechanism enables the system to maintain reliability with lower power dissipation.
Data Source
AI summary
Regulator circuitry includes first to third output transistors, a first control transistor and a circuit stage. The first and second output transistors, and the first control transistor have a first channel conductivity type. The second output transistor has a second channel conductivity type. The first and second output transistors have a drain coupled to an output node and a source coupled to a first power supply line. The third output transistor has a drain coupled to the output node and a source coupled to a second power supply line. The circuit stage is configured to drive the gates of the first output transistor, the third output transistor, and the first control transistor based on a specified level of the output voltage.


