Transceiver Amplitude Control for IEEE 1394b Power Optimization
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Solution Overview
Problem
Devices connected to IEEE 1394.b networks experience high power consumption due to unnecessarily high output amplitudes, especially when transmitting data between devices with different transfer speeds, leading to increased electromagnetic noise and inefficient power use, particularly in longer cable configurations.
Innovation Solution
A semiconductor device with a control unit that adjusts the amplitude of output signals based on detected signals from a communication peer, ensuring the minimum amplitude required for stable communication is set, thereby reducing power consumption and electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output amplitude is set to the standardized maximum value (800 mV) to ensure stable communication, then communication reliability is improved, but power consumption increases unnecessarily
Solution Approach 1:
The patent implements dynamic amplitude adjustment where the transmission circuit changes output amplitude based on detected signal quality from the communication peer. The amplitude is adjusted in steps (e.g., 800mV → 400mV → 200mV) based on whether the peer can successfully receive and respond to signals, thereby optimizing power consumption while maintaining communication reliability.
Solution Approach 2:
The patent uses feedback from the communication peer to control transmission amplitude. The transmission circuit detects response signals from the peer and adjusts its output amplitude accordingly. This closed-loop feedback mechanism ensures that amplitude is optimized based on actual communication conditions rather than using fixed maximum values.
2Length of stationary object
If the output amplitude is increased to support longer cable lengths, then communication range is extended, but electromagnetic noise increases
Solution Approach 1:
The system dynamically adjusts amplitude based on cable length detection. When longer cables are detected (through signal attenuation measurements), the amplitude is increased only to the extent necessary to maintain communication, rather than always using maximum amplitude. This reduces electromagnetic noise while extending communication range.
Solution Approach 2:
The patent changes the amplitude parameter adaptively based on communication conditions including cable length. By measuring signal attenuation and adjusting amplitude accordingly, the system optimizes the balance between communication range and electromagnetic noise generation.
Data Source
AI summary
A transceiver that reduces power consumption when data is transferred between devices in different modes. The transceiver is arranged in a first node and in a second node, which communicate between each other. A first control unit generates a first signal transmitted from the first node in predetermined time intervals during a first period that establishes an environment for communication between the first node and the second node. The second node transmits a second signal transmitted in response to the first signal. The first control unit generates a third signal upon detection of the second signal. A second control unit gradually decreases amplitude of the first signal based on the third signal to set the amplitude of the first signal to a predetermined amplitude so that the second node is receivable of the first signal.