Tracking-Circuit Level Shifter for Fast Multi-Voltage Switching
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Solution Overview
Problem
Existing voltage level shifters face challenges in efficiently adapting digital signals between integrated circuits operating at different voltage domains, leading to performance limitations and reliability issues due to direct application of input signals in lower voltage domains to cross-latch circuits.
Innovation Solution
The proposed high-speed over-drive level shifter employs a cross-latch circuit and a tracking circuit to shift input signals from a lower voltage domain to a higher voltage domain, using complementary output signals and tracking signals based on the greater of control signals or voltage levels, enhancing performance and reliability by avoiding direct signal application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If input signals from lower voltage domain are directly applied to cross-latch circuit, then device complexity is reduced, but reliability deteriorates due to performance limitations
Solution Approach 1:
The patent introduces control nodes and tracking circuits as intermediary elements between the input circuit and cross-latch circuit. These intermediaries generate control signals that properly adapt voltage levels before signals reach the cross-latch circuit, ensuring reliable operation while maintaining a relatively simple overall structure.
Solution Approach 2:
The control nodes perform preliminary signal preparation by generating appropriate control signals before the main signal processing in the cross-latch circuit. This preliminary action ensures that voltage level adaptation is completed in advance, preventing reliability issues during the main operation.
2Ease of manufacture
If traditional level shifter design is used, then manufacturing simplicity is maintained, but operating speed is limited
Solution Approach 1:
The patent employs dynamic control signals generated by the tracking circuit that adapt in real-time to input signal transitions. This dynamic approach enables faster response and higher toggling rates while maintaining ease of manufacture through standard circuit implementation techniques.
Solution Approach 2:
The tracking circuit provides feedback mechanisms that monitor control signals and adjust voltage level adaptation accordingly. This feedback enables faster operating speeds by ensuring proper signal conditioning at each transition, while the overall structure remains manufacturable using conventional processes.
3Device complexity
If voltage level adaptation is performed without tracking circuit, then device complexity is reduced, but performance deteriorates
Solution Approach 1:
The control nodes serve multiple functions: they generate control signals for the cross-latch circuit, enable voltage level adaptation, and support high-speed operation. This multi-functionality improves performance without proportionally increasing device complexity, as the same components perform multiple critical tasks.
Data Source
AI summary
A level shifter includes an input circuit having first and second input terminals configured to receive complementary input signals at a first voltage level and a second voltage level. A cross-latch circuit is coupled to the input circuit, and has first and second output terminals configured to provide complementary output signals at a third voltage level and a fourth voltage level. The input circuit includes first and second control nodes configured to output first and second control signals at the first voltage level and the fourth voltage level based on the input signals. A tracking circuit is coupled to the input circuit and the cross-latch circuit, and is configured to input first and second tracking signals to the cross-latch circuit based on the first and second control signals, wherein the first tracking signal is the greater of the first control signal and the third voltage level, and the second tracking signal is the greater of the second control signal and the third voltage level.