Filter State Storage for Receiver Settling Time Reduction
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Solution Overview
Problem
Existing receivers experience prolonged settling times and increased power consumption due to low corner frequencies in DC filters, which affect receive sensitivity and transmit-to-receive turnaround times.
Innovation Solution
Implementing a receiver with a quality detector to store and restore the filter state, allowing for faster re-settling by using a controller to store the filter state when signal quality metrics meet a threshold and restoring it upon re-enabling, thereby reducing settling time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the corner frequency of the DC filter is lowered to improve filtering performance, then the filtering effect on DC components is improved, but the settling time of the filter is extended
Solution Approach 1:
The filter state is stored in advance when signal quality metrics meet a threshold level, so that when the receiver is re-enabled, the pre-stored state can be quickly restored instead of requiring a complete re-settling process. This preliminary storage of optimal filter states resolves the contradiction by eliminating the need for long settling times while maintaining low corner frequency filtering performance.
2Reliability
If the settling time is extended to improve filtering performance, then the filtering effect is improved, but the power consumption is increased
Solution Approach 1:
The filter state is stored in advance when optimal filtering is achieved, allowing the receiver to quickly restore and resume operation without prolonged settling. This reduces the time the receiver must remain in high-power active state, thereby reducing overall power consumption while maintaining filtering performance.
Solution Approach 2:
The receiver can periodically check signal quality metrics and update stored filter states, enabling it to efficiently alternate between active measurement phases and low-power operation phases, thus reducing average power consumption while maintaining filtering effectiveness.
3Reliability
If the settling time is extended to improve filtering performance, then the filtering effect is improved, but the transmit-to-receive turnaround time is increased
Solution Approach 1:
Filter states are stored in advance during periods when filtering performance is optimal, enabling rapid restoration when switching from transmit to receive mode. This eliminates the need for long settling times during mode transitions, thereby reducing turnaround time while maintaining filtering performance.
Data Source
AI summary
In one embodiment, the present invention includes a system that having a low noise amplifier (LNA) to receive and amplify a radio frequency (RF) signal, a mixer to receive and downconvert the RF signal to a second frequency signal, a filter to receive and filter the second frequency signal, a demodulator to receive and demodulate the filtered second frequency signal to output demodulated data, and a quality detector to detect a quality of the demodulated data and output a quality indicator based on the data quality. In addition, the system can include a controller coupled to the filter to cause a state of the filter to be stored into a storage responsive to the quality indicator.