Multi-Chip Antenna Diversity Power Gating by Channel Conditions
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Solution Overview
Problem
Traditional multi-chip antenna diversity architectures consume double power even in favorable channel conditions, as both receiver chips are kept powered on to protect against degrading channel conditions, leading to inefficient power management and increased energy consumption.
Innovation Solution
A multi-chip antenna diversity architecture that includes a master and slave receiver chip, where a Diversity State Machine (DSM) automatically powers down either the master or slave chip based on channel conditions, using a General Purpose Input-Output (GPIO) switch to control power states, and disables unnecessary components like clock PLLs and crystal oscillators when not needed, optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both receiver chips are kept powered on all the time to protect against degrading channel conditions, then reliability is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the operational state of receiver chips based on real-time channel conditions. The diversity controller monitors channel quality and transitions chips between active and powered-off states, making the system adaptable rather than static. This resolves the contradiction by allowing high reliability when needed (degraded channels) while minimizing power consumption when channels are good.
Solution Approach 2:
The system changes the operational parameter of the receiver chips from a fixed 'always on' state to a variable state based on channel conditions. By monitoring channel quality metrics and adjusting chip power states accordingly, the system optimizes the balance between reliability and power consumption. When channel conditions exceed a threshold, chips are powered down to save energy; when conditions degrade, chips are activated to maintain reliability.
2Reliability
If multiple receiver chips are used to achieve antenna diversity benefits, then performance is improved, but power consumption doubles
Solution Approach 1:
Instead of always using full diversity (both chips active), the system applies partial action by using only one chip when channel conditions are sufficient. This reduces power consumption while maintaining acceptable performance. The diversity controller assesses whether full diversity is necessary or if single-chip operation suffices, optimizing the trade-off between performance and power usage.
Solution Approach 2:
The system periodically evaluates channel conditions and adjusts chip operation states accordingly. Rather than maintaining constant dual-chip operation, the diversity controller continuously monitors channel quality and transitions between single-chip and dual-chip modes as needed, creating a periodic assessment and adjustment cycle that balances performance and power consumption.
3Reliability
If both receiver chips operate simultaneously, then error-free audio/video is ensured under all conditions, but power efficiency deteriorates
Solution Approach 1:
The diversity controller implements feedback by continuously monitoring channel conditions and using this information to control chip power states. This closed-loop control ensures that chips are activated only when channel conditions indicate a need for diversity, thereby maintaining error-free audio/video when necessary while improving power efficiency by avoiding unnecessary dual-chip operation in good conditions.
Solution Approach 2:
The system uses its own channel condition monitoring capability to make autonomous decisions about chip operation. The diversity controller self-regulates by assessing channel quality and determining when diversity is needed, eliminating the need for external control and enabling the system to serve its own power optimization needs while maintaining reliability.
Data Source
AI summary
A multi-chip antenna diversity architecture includes a first receiver chip including a first tuner, and a first demodulator directly connected to the tuner. The first demodulator demodulates the first input signal received from the first tuner. A first power sequencer that controls the first receiver chip, and a first chip ID including a voltage source VSS that indicates the first receiver chip as a slave chip. A second receiver chip includes a second tuner, and a second demodulator directly connected to the second tuner. The second demodulator demodulates the second input signal received from the second tuner. A second diversity combiner directly connected to the second demodulator. A second chip ID includes a voltage source VDD that indicates the second receiver chip as a master chip. A Diversity State Machine (DSM) controls an operating state of the first receiver chip and the second receiver chip that are structurally identical.