Wideband RSSI Circuit Using Shared ADC Modules
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Solution Overview
Problem
Existing wireless communication circuits face challenges in effectively detecting and mitigating adjacent channel interference and multipath fading, leading to circuit saturation and reduced sensitivity, particularly in multi-system operations, due to the limitations of traditional receive signal strength indicators and auto gain control circuits.
Innovation Solution
A wireless communication circuit with a wideband received signal strength indicator (WBRSSI) that utilizes a controller to switch configurations between unused analog-to-digital converter and demodulator modules from different systems, minimizing circuit size and cost by sharing components and enabling efficient auto gain control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wideband receive signal strength indicator (WBRSSI) circuit is added to detect interference and prevent front-end saturation, then the sensitivity and reliability of the receiver are improved, but the circuit size and complexity increase
Solution Approach 1:
The patent makes existing ADC and demodulator modules perform dual functions: their primary function for normal signal processing and a secondary function as WBRSSI blocks for interference detection. By controlling switches to route signals appropriately, the same hardware components serve multiple purposes, eliminating the need for dedicated WBRSSI circuitry and thus reducing overall circuit complexity while maintaining reliable interference detection capability
Solution Approach 2:
The patent combines the WBRSSI function with existing ADC and demodulator modules by merging their operational pathways. Through switch control, the signal flow is directed such that these modules process both normal communication signals and wideband interference detection signals, effectively combining multiple functions into unified circuit blocks and reducing total circuit size
2Measurement precision
If traditional receive signal strength indicator (RSSI) and auto gain control (AGC) circuits are added to adjust amplifier gain, then the received signal strength is optimized for ADC threshold swing, but the circuit cannot effectively detect adjacent channel interference and multipath fading
Solution Approach 1:
The patent implements dynamic functionality by enabling the ADC and demodulator modules to switch between different operational modes. Through controller-directed switch actuation, these modules dynamically adapt to perform either normal signal processing or wideband interference detection based on system requirements, providing both precise signal strength measurement and versatile interference detection capabilities
3Object-affected harmful factors
If separate dedicated WBRSSI circuitry is implemented to detect wideband interference, then the front-end saturation is prevented, but the integration circuit (IC) cost and circuit size increase
Solution Approach 1:
The patent enables existing signal processing modules to serve themselves by performing interference detection as part of their normal operation. The ADC and demodulator modules, when routed appropriately via switches, automatically detect wideband interference and provide feedback for gain adjustment, eliminating the need for separate dedicated WBRSSI circuitry and reducing manufacturing costs
Data Source
AI summary
It is an objective of the present invention to provide a circuit with a wideband received signal strength indicator, used for multiple systems. By using the switches and the analog-to-digital converter and the demodulator, the circuit of the present invention has the advantages of auto gain control, circuit size reduction and power-saving.