Wakeup Receiver Circuit Using Periodic Latch Activation
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Solution Overview
Problem
Conventional wakeup receivers in electronic systems consume significant energy from the battery, even in power saving mode, due to their design, which is inefficient during periods of inactivity.
Innovation Solution
A low-power wakeup receiver circuit utilizing a cross-coupled transistor latch circuit and a monoflop circuit to detect differential signals on a bus, allowing devices to wake up only in response to specific activity detection, thereby minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wakeup receivers are used to detect bus activity and wake up devices, then devices can be woken up from power saving mode, but the wakeup receivers consume significant energy even during periods of inactivity
Solution Approach 1:
The wakeup receiver circuit operates periodically rather than continuously. The monoflop circuit generates periodic wake-up signals that activate the latch circuit only during specific time intervals, allowing the receiver to detect bus activity periodically while remaining in a low-power state during inactive periods. This periodic operation maintains reliable wake-up detection capability while significantly reducing average energy consumption compared to continuous operation.
2Reliability
If the wakeup receiver continuously monitors the bus for activity, then no wake-up signal is missed, but energy consumption increases significantly
Solution Approach 1:
The circuit uses a monoflop circuit to generate preliminary periodic activation signals before the actual wake-up detection is needed. These preliminary signals periodically activate the latch circuit to sample the bus state, ensuring that if a wake-up signal occurs, it will be captured during one of the periodic activation windows. This preliminary periodic action ensures reliable detection without requiring continuous monitoring, thus preventing excessive battery drain during power saving mode.
Data Source
AI summary
A system includes multiple devices connected in a chain-like structure, each device of the multiple devices coupled to at least one bus. A device of the plurality of devices includes a circuit configured to detect activity of a differential signal of a bus coupled to the device to cause a wakeup of the device in response to the detection.