Bias Reference Acceleration for Fast Settling and Charge Compensation
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Solution Overview
Problem
Conventional low power modules in integrated circuits take a long time to settle and are sensitive to charge injection during enabling and disabling events, failing to meet wake-up timing specifications and increasing power consumption.
Innovation Solution
A bias acceleration system and charge injection compensation method that accelerates settling time and minimizes disturbance during transitions, using a bias accelerator and charge injection compensator to facilitate fast transitions between power modes without significantly increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low power bias reference circuits are used to reduce power consumption, then power consumption is reduced, but settling time increases and wake-up timing specifications are not met
Solution Approach 1:
The bias accelerator circuit is pre-configured and activated before the main bias reference circuit to quickly establish initial bias conditions. This preliminary action allows the system to meet wake-up timing requirements while the low power bias reference circuit subsequently takes over for steady-state operation.
Solution Approach 2:
The system dynamically switches between two bias reference modes: a fast-settling high-power mode during wake-up transitions and a low-power mode during steady-state operation. The bias accelerator enables this dynamic behavior by providing temporary high-current paths that quickly charge parasitic capacitances, after which the system transitions to the low-power configuration.
2Use of energy by moving object
If low power bias reference circuits are used to reduce power consumption, then power consumption is reduced, but charge injection sensitivity increases during enabling and disabling events
Solution Approach 1:
The bias accelerator acts as an intermediary circuit between the control logic and the low power bias reference circuit. It absorbs and manages charge injection effects during enabling/disabling events, preventing these harmful effects from propagating to the sensitive low power bias reference circuit while allowing the low power mode to operate during steady-state conditions.
Solution Approach 2:
The bias accelerator is activated in advance of the low power bias reference circuit during enabling events, establishing stable voltage conditions before the sensitive low power circuit is enabled. This preliminary action prevents charge injection from causing disturbances in the low power circuit operation.
3Adaptability or versatility
If different circuit versions are used for multiple power modes to meet power requirements, then power mode requirements are met, but device complexity increases and settling time is extended
Solution Approach 1:
The bias accelerator circuit serves multiple functions: it acts as a fast-settling bias reference during wake-up, provides charge injection compensation during mode transitions, and enables the low power bias reference circuit to meet timing requirements. This multi-functionality eliminates the need for completely separate circuit versions for different power modes, reducing overall complexity while maintaining power mode adaptability.
Data Source
AI summary
A bias acceleration system for a reference bias generator including a bias accelerator and an activation controller. The reference bias generator includes mirrored transistor devices coupled in a mirrored configuration with a primary bias transistor device at a bias node, in which the primary bias transistor device is coupled to a bias current source which is activated by a reference enable signal. The bias accelerator amplifies bias current applied to the primary bias transistor device and applies amplified current to the bias node in response to the bias current source when activated by the reference enable signal. The activation controller enables the bias accelerator in response to the reference enable signal and disables the bias accelerator when the bias node stabilizes. When one of the mirrored transistor devices is switched, a charge injection compensator compensates for charge injection caused by switching one or off the switched transistor device.