Voltage Generation Amplifier Bias Control for Power-Up Peak Current
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Solution Overview
Problem
Semiconductor circuits face a peak current issue during power-up due to the fast response speed of voltage generation circuits, which can lead to unstable internal voltage generation.
Innovation Solution
An amplifier and voltage generation circuit design that detects the difference between a reference voltage and a feedback voltage using a control signal, allowing for the adjustment of bias current to manage the peak current, featuring a configuration with transistors and a driver to generate internal voltage while using a distribution resistor and capacitor to control feedback voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the voltage generation circuit is designed to have a fast response speed by increasing its driving capability, then the response speed is improved, but a peak current problem occurs at the beginning of operation such as power-up state
Solution Approach 1:
The patent applies preliminary action by setting the amplifier in a high-impedance state before power-up operation through the control signal. This preliminary configuration prevents the immediate draw of peak current when the voltage generation circuit starts operating, while still allowing fast response speed once the operation begins. The control signal pre-configures the circuit state to avoid the harmful peak current effect.
Solution Approach 2:
The patent implements dynamics by making the amplifier's impedance state changeable between high-impedance and low-impedance states based on the control signal. This dynamic adjustment allows the circuit to adapt its characteristics: maintaining high impedance during power-up to reduce peak current, and switching to low impedance during operation to ensure fast response speed. The control signal orchestrates this dynamic state transition.
2Productivity
If the driving capability is increased to achieve fast response speed, then productivity is improved, but the stability of internal voltage generation deteriorates due to peak current
Solution Approach 1:
The control signal performs preliminary action by configuring the amplifier to a high-impedance state before the voltage generation circuit begins operation. This preliminary configuration prevents the peak current that would otherwise destabilize the internal voltage during power-up, while preserving the high driving capability for when operation is needed. The stability is protected in advance without sacrificing productivity.
Solution Approach 2:
The control signal acts as an intermediary that mediates between the conflicting requirements of high driving capability and voltage stability. It introduces a control dimension that allows the amplifier to switch between high-impedance (stable voltage) and low-impedance (high driving capability) states, resolving the contradiction by adding temporal and conditional control to the system.
Data Source
AI summary
A voltage generation circuit includes an amplifier configured to detect a difference between a reference voltage and a feedback voltage according to a control signal and a bias current, and configured to generate a driving signal. The voltage generation circuit also includes a driver configured to generate an internal voltage by driving an external voltage according to the driving signal. The amount of the bias current may be forcibly adjusted by the control signal.