Voltage Shifting Circuit for Non-Complementary Logic
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Solution Overview
Problem
Non-complementary logic circuits, such as those using hydrogenated amorphous silicon or organic semiconductors, face challenges with reduced switching speed and increased power consumption due to the lack of full rail-to-rail voltage swing, which hampers the cascading of logic units and results in sequential logic variations from idealized truth tables.
Innovation Solution
A voltage shifting circuit is implemented with two transistors in electrical parallel, along with downshift and upshift capacitors, to enhance the voltage swing without excessive power consumption or speed compromise, using hydrogenated amorphous silicon or organic semiconductors for transistors and capacitors, and diodes or connected transistors for voltage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-complementary logic circuits use hydrogenated amorphous silicon or organic semiconductors, then cost is reduced and manufacturing is simplified, but voltage swing is reduced and power consumption increases
Solution Approach 1:
The circuit is divided into two parallel transistor branches (n-type and p-type), each handling different voltage ranges. This segmentation allows each transistor type to operate optimally within its voltage range, achieving full rail-to-rail swing while maintaining low power consumption through specialized capacitor circuits for each branch.
Solution Approach 2:
Capacitor circuits are introduced as intermediary elements to shift voltage levels for the transistors. The first capacitor circuit downshifts voltages for the n-type transistor, while the second capacitor circuit upshifts voltages for the p-type transistor, enabling full voltage swing without excessive power consumption.
2Ease of manufacture
If non-complementary logic circuits use hydrogenated amorphous silicon or organic semiconductors, then cost is reduced and manufacturing is simplified, but switching speed is reduced
Solution Approach 1:
The circuit segments the voltage handling into two parallel paths with specialized transistors and capacitor circuits. This allows each path to be optimized for its specific voltage range, improving switching speed within each segment while maintaining overall circuit simplicity and low cost.
Solution Approach 2:
The invention changes the voltage parameters dynamically through capacitor-based shifting circuits. By adjusting voltage levels through the capacitor networks, the transistors operate in optimal regions for their respective types, enhancing switching speed while preserving the manufacturing advantages of using single-polarity transistors.
3Device complexity
If non-complementary logic circuits lack full rail-to-rail voltage swing, then circuit complexity is reduced, but cascading of logic units is hampered and sequential logic varies from idealized truth tables
Solution Approach 1:
Capacitor circuits serve as intermediary voltage-shifting elements that enable full rail-to-rail swing. The first capacitor circuit mediates voltage downshifting for the n-type transistor path, while the second capacitor circuit mediates voltage upshifting for the p-type transistor path, ensuring complete voltage coverage and reliable logic operation.
Solution Approach 2:
The invention introduces dynamic voltage shifting through capacitor-based circuits that adaptively adjust voltage levels during operation. This dynamic approach enables the circuit to achieve full rail-to-rail swing and maintain accurate sequential logic behavior without requiring overly complex static circuit design.
Data Source
AI summary
A voltage shifting circuit includes a first transistor in electrical parallel with a second transistor between an input node and an output node; a gate threshold capacitor disposed between the output node and a gate of the second transistor; and at least one of a) a downshift capacitor disposed between the input node and a drain/source of the first transistor, arranged to downshift a voltage from the input node and apply the downshifted voltage to the drain/source of the first transistor; and b) an upshift capacitor disposed between the input node and a drain/source of the second transistor, arranged to upshift a voltage from the input node and apply the upshifted voltage to the drain/source of the second transistor. This circuit is advantageously directly coupled to an input or output node of a non-complementary logic gate, of which multiple instances can be deployed in display circuitry or solar panels.