Threshold-Voltage Inverter Circuit for Short-Circuit Power Reduction
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Solution Overview
Problem
Conventional inverter circuits face high dynamic power dissipation and slow switching speed due to increased short-circuit current, which also results in higher on-chip area and cost, despite efforts to reduce short-circuit power consumption.
Innovation Solution
The proposed inverter circuit employs a configuration with high and low threshold voltage transistors in parallel, where high threshold voltage transistors maintain low resistance in steady states and high resistance during transitions, minimizing short-circuit current and power dissipation while maintaining fast switching speed and reducing on-chip area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional inverter circuits use standard transistor configurations, then the circuit structure is simple, but short-circuit power dissipation increases and switching speed decreases
Solution Approach 1:
The inverter circuit is segmented into multiple transistor stages: a first inverter stage with first and second transistors, and a second inverter stage with third and fourth transistors. The second stage is specifically designed to control short-circuit current by having its transistors' gates connected to opposite outputs, creating a push-pull effect that prevents simultaneous conduction. This segmentation allows the circuit to reduce short-circuit power dissipation while maintaining manageable complexity through modular design.
2Productivity
If transistor size is reduced to increase processing power, then processing power increases, but power consumption increases
Solution Approach 1:
The patent employs transistors with different threshold voltage parameters - the first and third transistors have a first threshold voltage, while the second and fourth transistors have a second threshold voltage that is lower than the first. This parameter differentiation allows small transistors to be used for high processing power while the varied threshold voltages control the timing and magnitude of current conduction, reducing overall power consumption despite the miniaturized transistor sizes.
3Loss of energy
If additional components are added to reduce short-circuit current, then short-circuit power dissipation decreases, but on-chip area increases
Solution Approach 1:
The patent merges the functionality of short-circuit current control into the existing inverter structure by adding only one additional transistor (the fourth transistor) and making specific connectivity changes. The third and fourth transistors form a complementary pair where their gates are connected to opposite outputs, creating an integrated control mechanism that reduces short-circuit current without requiring separate control circuits or additional on-chip components, thus minimizing area increase.
Data Source
AI summary
A low power inverter circuit includes first and second transistors that receive an input signal at their gate terminals. The first and second transistors are connected by way of their source terminals to third and fourth transistors, respectively. The third and fourth transistors are connected in parallel with fifth and sixth transistors, respectively. The third and fourth transistors are continuously switched on, and the fifth and sixth transistors are controlled in such a way to reduce short circuit current flowing through the first and second transistors when the input signal transitions from one state to another.