Negative Voltage Level Shifting With Bias-Controlled Switching
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Solution Overview
Problem
Existing negative voltage level conversion circuits face issues with instantaneous switching, leading to charge consumption and a risk of voltage pull-up at the output end of the negative voltage generation circuit, affecting the performance of subsequent circuits due to a large voltage span between positive and negative voltages.
Innovation Solution
A circuit comprising a negative voltage generation circuit, a bias circuit, and a level shift unit circuit, where the bias circuit receives an enable signal to output a bias voltage controlling the switching process, accelerating the discharging speed of the level shift unit to ground and reducing charge consumption, and the bias circuit is connected to a DC power supply to pull up the bias voltage before enabling, thereby controlling the switching speed and reducing overvoltage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If instantaneous switching is used in level conversion, then switching speed is improved, but charge consumption increases and voltage pull-up risk occurs
Solution Approach 1:
The bias circuit pre-charges the level shift unit circuit before switching occurs by pulling up the bias voltage through the DC power supply. This preliminary action ensures that charges are prepared in advance, reducing the need for large charge consumption during instantaneous switching and preventing voltage pull-up at the output end of the negative voltage generation circuit.
Solution Approach 2:
The bias circuit acts as an intermediary between the DC power supply and the level shift unit circuit. It controls the switching process by outputting a bias voltage that gradually adjusts the state of the level shift unit, mediating the transition and avoiding direct instantaneous switching that causes excessive charge consumption and voltage instability.
2Speed
If instantaneous switching is used in level conversion, then switching speed is improved, but voltage stability deteriorates
Solution Approach 1:
The DC power supply pulls up the bias voltage before the bias circuit is enabled, performing preliminary preparation. This ensures that when switching occurs, the voltage is already stabilized, preventing voltage pull-up at the output end of the negative voltage generation circuit and maintaining voltage stability throughout the switching process.
Solution Approach 2:
The bias circuit receives control signals and adjusts the bias voltage accordingly, creating a feedback mechanism that monitors and controls the switching process. This feedback ensures that voltage levels remain stable during transitions, preventing voltage pull-up and maintaining overall voltage stability in the circuit.
Data Source
AI summary
A negative voltage level conversion control circuit comprises a negative voltage generation circuit, a bias circuit, and a level shift unit circuit, wherein an output end of the bias circuit is connected to the level shift unit circuit, and the other end of the bias circuit is connected to the negative voltage generation circuit; an output end of the negative voltage generation circuit is connected to the level shift unit circuit; the bias circuit is configured to receive an enable signal and output a bias voltage; the bias voltage is used for controlling a switching process of the level shift unit circuit; the enable signal is used for enabling the bias circuit and the negative voltage generation circuit.