Self-Regulated Comparator Circuit for Low-Power Refresh Cycles
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Solution Overview
Problem
High power consumption of StrongARM comparators in high-speed multi-channel Serializer/Deserializer (SerDes) and advanced power supply monitoring (PSM) circuits, particularly during refreshing cycles, poses a challenge in low-power applications such as mobile devices.
Innovation Solution
A self-regulated low power comparator design that includes an input differential pair, a self-regulated device with a mode selector and transistors of varying threshold voltages, a tail current switch, and pre-charge circuits, allowing the comparator to switch between normal and power-saving modes, reducing power consumption by charging output nodes from threshold voltages to a predetermined level instead of ground, thereby minimizing refresh cycle power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If StrongARM comparator is used in high-speed multi-channel SerDes and advanced PSM circuits, then comparison speed and functionality are improved, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic power management by introducing a mode selector that switches between normal mode and power-saving mode based on operational requirements. The self-regulated device dynamically adjusts the tail current supplied to the differential pair, enabling the comparator to adapt its power consumption level according to whether high-speed comparison or low-power operation is needed, thus resolving the contradiction between speed and power consumption
Solution Approach 2:
The patent changes key operational parameters including tail current magnitude and output node charging voltage levels. By regulating the tail current through the self-regulated device and charging output nodes from threshold voltages rather than ground, the comparator achieves parameter optimization that reduces power consumption while maintaining comparison functionality, addressing the power consumption issue
2Duration of action of stationary object
If StrongARM comparator operates during each clock cycle, then continuous monitoring capability is improved, but power consumption remains high due to refreshing cycles
Solution Approach 1:
The patent implements periodic action by enabling the comparator to alternate between normal mode (during comparison operations) and power-saving mode (during refresh cycles). The mode selector controls the timing of mode transitions, allowing the circuit to perform continuous monitoring functionality while reducing power consumption during periodic refresh intervals when high-speed comparison is not required
Solution Approach 2:
The self-regulated device automatically adjusts the tail current and power-saving level based on operational state without requiring external intervention. This self-service mechanism enables the comparator to autonomously transition between power consumption levels, maintaining continuous monitoring capability while minimizing power consumption during refresh cycles
3Use of energy by moving object
If self-regulated device with mode selector is added to reduce power consumption, then power-saving capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the self-regulated device with the existing comparator structure, integrating power management functionality into the core comparison circuit. The mode selector and self-regulated device are combined with the differential pair and tail current switch, creating a unified structure that achieves power-saving capability without requiring completely separate power management circuits, thus limiting the increase in device complexity
Data Source
AI summary
A low power comparator and a self-regulated device for adjusting power saving level of an electronic device are provided. The low power comparator includes an input differential pair circuit, a self-regulated device, and a tail current switch. The input differential pair circuit is configured to receive input signals to be compared. The self-regulated device is coupled to the input differential pair circuit and includes a self-regulated circuit which has a first transistor with a first threshold voltage and a second transistor with a second threshold voltage and is configured to adjust a power saving level of the low-power comparator according to the first threshold voltage and the second threshold voltage. The tail current switch is coupled to the input differential pair circuit through the self-regulated circuit to provide a constant current to the input differential pair circuit.