Feedback Receiver Gain Switching for Stable ADC Input Power
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Solution Overview
Problem
Feedback receivers in transceivers face challenges in processing signals with varying power levels and coupler efficiency, leading to significant signal power variations, which existing technologies fail to adequately compensate for.
Innovation Solution
A system and method that adjust the gain switch points of a feedback receiver using a processor and memory, based on the difference between measured and expected ADC input power, to minimize ADC saturation and maximize signal-to-noise ratio (SNR) by dynamically controlling the gain element in the feedback receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the feedback receiver processes signals with varying power levels and coupler efficiency, then the receiver can handle a wide range of operating conditions, but significant signal power variations occur at the ADC input
Solution Approach 1:
The patent implements dynamic gain switching by selecting different gain values from a set of predetermined gain values based on the detected signal power level. The gain element dynamically adjusts its amplification factor in response to varying input signal conditions, allowing the feedback receiver to maintain stable ADC input power across a wide range of transmit power levels and coupler efficiencies.
Solution Approach 2:
The system changes the gain parameter of the feedback receiver based on detected signal conditions. By monitoring the signal power and selecting appropriate gain values from a predetermined set, the system adjusts the gain parameter to compensate for variations in transmit power and coupler efficiency, thereby stabilizing the power presented to the ADC.
2Device complexity
If fixed gain values are used in the feedback receiver, then the device complexity is reduced, but ADC saturation occurs under varying signal conditions
Solution Approach 1:
Rather than using a single fixed gain value, the patent employs a dynamic gain selection mechanism that chooses from multiple predetermined gain values based on the current signal power level. This dynamic approach prevents ADC saturation while maintaining relatively simple device complexity, as the gain values are selected from a predefined set rather than requiring continuous adjustment.
Solution Approach 2:
The system performs preliminary action by establishing a set of predetermined gain values before operation. These pre-calculated gain values are stored and readily available for selection based on detected signal conditions, eliminating the need for complex real-time gain calculation while ensuring appropriate gain selection to prevent ADC saturation.
3Stability of the object's composition
If gain switching is implemented to prevent ADC saturation, then signal power stability is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic gain switching with relatively simple complexity by using a predetermined set of gain values selected based on signal power detection. The gain element transitions between discrete gain states rather than requiring continuous adjustment, simplifying the control mechanism while maintaining signal power stability at the ADC input.
Solution Approach 2:
The system reduces device complexity by performing preliminary action - establishing a predetermined set of gain values before operation. These pre-configured gain values are stored in memory and selected based on detected signal conditions, eliminating the need for complex real-time gain calculation algorithms or adaptive tuning mechanisms.
Data Source
AI summary
A system for adjusting feedback receiver gain including a power amplifier configured to generate a transmit signal, a feedback receiver configured to receive a portion of the transmit signal, the feedback receiver having a gain element and an analog-to-digital converter (ADC), and a processor and a memory operably coupled to the gain element; wherein the processor and memory are configured to select an adjusted gain switch point for the gain element based on a difference between a measured ADC input power and an expected ADC input power.