Receiver Chain Peak Detection With Dual AGC Feedback Paths
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Solution Overview
Problem
Existing communication receiver devices face signal saturation and distortion issues due to high gain amplification, especially when stronger signals are amplified, leading to interference from both data-bearing and interference components, which can result in data loss.
Innovation Solution
An integrated circuit with a receiver chain that includes a separate control path to preserve and measure interference components, allowing the automatic gain control (AGC) circuit to adjust gain based on both signal strength and interference levels, thereby preventing saturation and improving signal extraction from weaker signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high gain amplification is applied to improve reception of weaker signals, then sensitivity to weak signals is improved, but signal saturation and distortion occur when amplifying stronger signals
Solution Approach 1:
The receiver chain is divided into two separate paths: a main path that filters interference and provides clean data-bearing signal feedback, and a control path that preserves interference components for accurate total signal strength measurement. This segmentation allows the AGC to independently optimize for both weak signal detection and saturation prevention.
Solution Approach 2:
The system implements dual feedback loops: one from the main path providing filtered signal strength feedback for data quality, and another from the control path providing total signal strength feedback (including interference) for gain control. This feedback mechanism enables the AGC to dynamically adjust gain based on actual signal conditions.
2Measurement precision
If filter stages are used to remove interference, then data-bearing signal quality is improved, but interference components are lost and cannot be used for AGC determinations
Solution Approach 1:
The receiver is segmented into main and control paths that diverge after amplification. The main path applies filtering to extract clean data-bearing signals, while the control path preserves the complete signal including interference. This allows both filtered quality and unfiltered total power information to be available simultaneously.
Solution Approach 2:
A copy of the amplified signal is created and routed to the control path, which maintains the full signal spectrum including interference. This copied path provides the AGC with accurate total power measurements without affecting the data quality in the main path.
3Device complexity
If a single feedback path is used for AGC control, then device complexity is reduced, but accurate measurement of both signal strength and interference levels cannot be achieved
Solution Approach 1:
The feedback system is segmented into two independent paths with distinct functions: the main path filters and measures data-bearing signal quality, while the control path preserves and measures total signal strength including interference. This segmentation enables precise dual-parameter measurement without excessive complexity.
Solution Approach 2:
The dual-path architecture serves multiple functions simultaneously: interference filtering for data quality, total power measurement for AGC control, and independent optimization of both signal detection and saturation prevention. This multi-functionality achieves comprehensive measurement capability with moderate complexity increase.
Data Source
AI summary
An integrated circuit device is provided. In some examples, the integrated circuit device includes an amplifier stage that receives an input signal and a control signal and provides an amplified signal in response. A main path is coupled to the amplifier stage that receives the amplified signal and provides a first feedback signal corresponding to a signal strength of a data-bearing portion of the input signal. A control path also receives the amplified signal and provides a second feedback signal corresponding to a signal strength of the data-bearing portion and an interference component. A gain control circuit is coupled to the main path and the control path that receives the first and second feedback signals and provides the control signal in response to the feedback signals. In some such examples, the control path and main path include separate mixer stages with different performance characteristics.