Bandwidth Extension Circuit With Aging-Averse Inductive Peaking
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Solution Overview
Problem
Active inductors used for bandwidth extension in high-end SERDES products suffer from destructive aging effects due to adverse operating conditions, limiting their operational lifetime.
Innovation Solution
A bandwidth extension circuit incorporating a driver, inverter, resistor, and switch, with a controller to operate the switch in open or closed states, allowing for aging-averse operation in active and power-down modes to mitigate HCl and BTI aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If active inductors are used for bandwidth extension, then high-frequency gain is boosted and bandwidth is extended, but destructive aging effects occur and operational lifetime is limited
Solution Approach 1:
The patent implements dynamic operation modes (active mode and power-down mode) that allow the circuit to switch between different states. In power-down mode, the active inductor is deactivated to prevent aging, while in active mode, it operates to provide bandwidth extension. This dynamic switching resolves the contradiction by temporal separation of function and protection.
Solution Approach 2:
The patent changes operational parameters (switching between active and power-down modes) to mitigate aging effects. By controlling the switch between different operational states, the circuit can extend bandwidth when needed and protect against aging when not in use, thus resolving the contradiction between bandwidth extension and operational lifetime.
2Productivity
If high-temperature operation and high voltage are used, then data-rate requirements are met, but aging effects are exacerbated
Solution Approach 1:
The patent employs periodic switching between active and power-down modes. During power-down mode, the circuit is protected from high-temperature and high-voltage aging effects. This periodic alternation allows the system to achieve high data-rates when needed while periodically resetting and protecting against cumulative aging damage.
Solution Approach 2:
The patent applies preliminary protective action by switching to power-down mode before severe aging can occur. The controller monitors operational conditions and preemptively deactivates the active inductor to prevent aging accumulation, thus protecting the circuit while maintaining productivity during active periods.
3Speed
If switch is operated in closed state, then bandwidth extension is achieved, but exposure to harmful operating conditions increases
Solution Approach 1:
The patent makes the switch state dynamic rather than fixed. The controller dynamically switches between closed state (for bandwidth extension) and open state (for aging protection) based on operational requirements. This resolves the contradiction by making the circuit adaptable to different operational conditions.
Solution Approach 2:
The patent changes the operational state parameter of the switch between closed and open positions. By controlling this parameter change, the system can achieve bandwidth extension when the switch is closed and protect against aging when the switch is open, thus resolving the contradiction between performance and reliability.
Data Source
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.