Wilson Current Mirror Level Shifter With Latch-Stabilized Output
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Solution Overview
Problem
Wilson current mirror level shifters experience unstable output voltages due to a floating output terminal, leading to leakage currents and unpredictable voltage levels.
Innovation Solution
A level shifter incorporating a Wilson current mirror circuit, leakage current control circuit, and latch circuit to stabilize output voltages by preventing leakage currents and maintaining a non-floating state of the output terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a Wilson current mirror level shifter circuit is used, then static current is blocked, but the output terminal becomes floating and outputs unstable output voltage
Solution Approach 1:
A latch circuit is introduced as an intermediary component between the Wilson current mirror circuit and the output terminal. The latch circuit includes a first latch transistor and a second latch transistor that work together to prevent the output terminal from floating while maintaining the static current blocking capability of the Wilson current mirror circuit.
Solution Approach 2:
The gate of the first latch transistor is connected to the output terminal, creating a feedback mechanism. When the output voltage becomes unstable or floats, the feedback signal activates the latch circuit to restore the output terminal to a stable state, thereby maintaining reliable output voltage levels.
2Reliability
If the output terminal is floating, then leakage current is generated, but the output voltage becomes unpredictable
Solution Approach 1:
The latch circuit serves as an intermediary that prevents the output terminal from entering a floating state where leakage current would occur. By maintaining a defined connection path through the latch transistors, the output terminal remains at a predictable voltage level even when the Wilson current mirror circuit blocks static current.
Solution Approach 2:
The latch circuit is designed to preemptively prevent the output terminal from floating before leakage current can occur. The feedback connection ensures that any tendency toward floating is counteracted in advance, maintaining both voltage predictability and preventing harmful leakage current generation.
Data Source
AI summary
A level shifter includes a Wilson current mirror circuit outputting an output voltage of an output node based on a first input voltage inverting a phase of an input voltage and a second input voltage inverting the phase of the first input voltage, a leakage current control circuit receiving the output voltage and controlling a leakage current generated in the Wilson current mirror circuit using the output voltage, and a latch circuit providing a voltage of a logic high level to the output node when the output voltage is a logic high level.