Switchable Active Inductor Circuit for Aging-Resistant Bandwidth Extension
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Solution Overview
Problem
Active inductors used in bandwidth extension for high-end SERDES products suffer from destructive aging effects, leading to degraded performance over time and limited operational lifetime, especially under high-temperature and high-voltage operating conditions.
Innovation Solution
A bandwidth extension circuit design that incorporates an active inductor with a switch, allowing for operation in active and power-down modes. This design mitigates aging by reducing exposure to aging conditions and modulating input signals to minimize HCI and BTI effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If active inductors are used for bandwidth extension in high-end SERDES products, then high-frequency gain is boosted and bandwidth is extended, but destructive aging effects occur leading to degraded performance and limited operational lifetime
Solution Approach 1:
The patent applies dynamics by making the inductor implementation switchable between active and passive modes. The circuit can dynamically transition between using an active inductor (for maximum bandwidth extension) and a passive inductor or no inductor (for aging mitigation), allowing the system to adapt its inductance characteristic based on operational needs and aging status
Solution Approach 2:
The patent implements periodic action through scheduled rejuvenation cycles where the circuit periodically switches to a passive inductor mode or disables the active inductor. This periodic intervention resets or mitigates the accumulated aging effects on the active inductor components, thereby extending the overall operational lifetime while maintaining high-frequency gain when needed
2Productivity
If active inductors operate under high-temperature and high-voltage conditions, then data-rate requirements are met, but aging effects are exacerbated leading to faster performance degradation
Solution Approach 1:
The patent applies preliminary anti-action by proactively implementing rejuvenation cycles and switchable configurations before severe aging occurs. The system preemptively mitigates aging effects by periodically switching to passive inductor mode or adjusting operating parameters, preventing the cumulative damage that would otherwise occur under continuous high-temperature and high-voltage operation
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the inductance implementation (active vs. passive) and potentially modifying operating parameters such as voltage or temperature thresholds. This allows the circuit to change its operational characteristics to reduce aging stress while maintaining the required data-rate performance
Data Source
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Figure 2A
AI summary
A circuit for inductive peaking may include a driver, an inverter, a resistor between an output node of the driver and an input node of the inverter and a switch. For example, a first node of the resistor may be connected to the output node of the driver and a second node of the resistor may be connected to the input node of the inverter. The switch may be connected between an output node of the inverter and the first node of the resistor. An input node of the driver may correspond to an input node of the circuit and the output node of the driver may correspond to an output node of the circuit.