Wakeup Circuit Toggle Filtering for Low-Power Signal Detection
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Solution Overview
Problem
Conventional signal detection circuits for power-efficient systems, such as automotive Ethernet PHY, are energy inefficient and area inefficient, requiring high power consumption and complex components like comparators and rectifiers, making them unsuitable for low power modes.
Innovation Solution
A wakeup circuit comprising an amplification stage and a filter stage, using a single stage gain path with inverter-based architecture, amplifies and filters signals to detect valid data toggles, generating a wakeup signal only when a threshold number of toggles is reached within a clock period, thus reducing power consumption and area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal detection circuits (with comparators and rectifiers) are used, then detection reliability is improved, but power consumption increases and area efficiency deteriorates
Solution Approach 1:
The patent extracts and removes the power-consuming comparator and rectifier components from the conventional signal detection circuit. Instead, it uses a simple amplifier followed by a digital filter that counts signal toggles, eliminating the need for complex analog comparison and rectification while maintaining detection reliability through digital toggle counting within a threshold time period.
Solution Approach 2:
The patent replaces the analog mechanical-style operation of comparators and rectifiers with a digital signal processing approach. The amplifier output is fed to a digital filter that counts toggles (transitions) of the signal, using digital logic instead of analog comparison circuits, thereby reducing power consumption while maintaining detection functionality.
2Reliability
If conventional signal detection circuits (with comparators and rectifiers) are used, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The patent removes the complex comparator and rectifier stages from the conventional detection circuit. The simplified circuit uses only an amplifier followed by a digital toggle counter filter, eliminating multiple complex analog components and reducing overall circuit complexity while preserving detection reliability through the toggle counting mechanism.
Solution Approach 2:
The patent merges the detection and filtering functions into a single integrated digital filter stage that counts toggles directly from the amplifier output. This consolidation eliminates the need for separate comparator and rectifier circuits, reducing device complexity while maintaining reliable signal detection through the combined amplify-and-count approach.
3Use of energy by moving object
If the circuit operates in low power mode, then power consumption is reduced, but the ability to detect wakeup signals deteriorates
Solution Approach 1:
The patent prepares the detection circuit for low-power operation by using an amplifier that remains active in sleep mode to continuously monitor the input signal. The amplifier output is fed to a digital filter that can detect toggles even at low power levels, ensuring the circuit is ready to detect wakeup signals immediately when they occur without requiring full power operation.
Solution Approach 2:
The patent replaces power-hungry analog comparators with a low-power amplifier and digital toggle counter combination. The digital filter counts signal transitions (toggles) from the amplifier output, using minimal power while maintaining reliable detection capability. This digital approach consumes significantly less power than conventional analog comparison circuits while preserving signal detection reliability in low-power mode.
Data Source
AI summary
A wakeup circuit includes an amplification stage circuit and a filter stage circuit. The amplification stage circuit is configured to, in response to receiving an input signal, generate an amplified digital signal that is proportional to the input signal. The filter stage circuit is configured to, in response to receiving a threshold number of toggles of the amplified digital signal within a pre-defined time period (such as one clock period of a clock signal), generate a wakeup signal as an output signal of the filter stage circuit.