Amplifier Circuit Diode Feedback for Overshoot Suppression
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Solution Overview
Problem
Conventional amplifier circuits experience overshoot issues due to insufficient phase margin, leading to unstable signal output and potential circuit damage, requiring costly design adjustments and increased fabricating costs to stabilize output voltage.
Innovation Solution
Incorporating a diode device between the output and input ends of the amplifier circuit to detect voltage differences and rapidly stabilize overshoot during transient states, while cutting off in steady states to maintain normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a larger phase margin is designed to suppress overshoot, then the output voltage stability is improved, but the dynamic response becomes slower
Solution Approach 1:
A diode device is introduced as an intermediary element connected between the output end and input end of the amplifier. The diode activates only during overshoot conditions (when voltage difference exceeds the barrier voltage), providing a corrective path that suppresses overshoot without continuously affecting the amplifier's dynamic response. This mediator approach allows selective intervention only when needed.
Solution Approach 2:
The diode device dynamically switches between conducting and non-conducting states based on the voltage difference across the amplifier. During transient overshoot, the diode conducts to suppress the voltage spike; during normal operation, it remains off to avoid affecting the amplifier's performance. This dynamic behavior allows the system to adapt to different operating conditions.
2Speed
If current is increased to speed up the transient state change, then the dynamic response is improved, but the overshoot suppression capability deteriorates
Solution Approach 1:
The diode device utilizes the overshoot voltage itself (the harmful effect) to activate the suppression mechanism. When the voltage difference exceeds the diode's barrier voltage during overshoot, the diode conducts and creates a feedback path that redirects the excess voltage energy, converting the harmful overshoot into a self-correcting mechanism without requiring external intervention or reduced current.
3Stability of the object's composition
If capacitors are added to the output end to reduce oscillation amplitude, then the output voltage stability is improved, but the fabricating cost and circuit area increase
Solution Approach 1:
Instead of adding complex compensation networks or multiple capacitors to the output end, the invention extracts the essential overshoot suppression function by using a simple diode device connected in a feedback configuration. This minimalistic approach achieves the desired stability without the overhead of additional output components, reducing both circuit area and fabricating cost.
Solution Approach 2:
The diode device serves multiple functions: it suppresses overshoot, provides feedback correction, and maintains amplifier performance during normal operation. This multi-functionality eliminates the need for separate compensation components, reducing overall circuit complexity while achieving both speed and stability goals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses overshoot in amplifier circuits, ensuring stable output voltage without affecting normal operation and reducing fabricating costs by using a diode device to manage voltage differences.
Implementation Method 1
When a voltage difference between the output end and the input end of the output amplifier is greater than a barrier voltage of the diode device, the diode device is turned on
Data Source
AI summary
An amplifier circuit including an input amplifier, an output amplifier and a diode device is provided. The output amplifier is coupled to the input amplifier and outputs an output voltage. The diode device is coupled between an output end and an input end of the output amplifier. When a voltage difference between the output end and the input end of the output amplifier is greater than a barrier voltage of the diode device, the diode device is turned on, and an overshoot of the output voltage is reduced.