Radio Power Control Using Analog Feedback and Digital Attenuation
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Solution Overview
Problem
Existing telecommunications radios face limitations in providing accurate and dynamic power level control across a range of power levels, with factory-tuned radios offering only single power levels and digital systems experiencing disruptions and requiring complex calibration, while prior art solutions fail to achieve seamless closed-loop operation and calibration-free designs.
Innovation Solution
A radio design combining a traditional analog feedback loop with a digitally controlled attenuator in the feedback path, allowing for accurate and selectable power levels across any range without calibration, enabling closed-loop operation and reducing calibration requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digitally controlled attenuator is used to achieve accurate power level control, then power level precision is improved, but data loss occurs on the signal path when attenuation changes
Solution Approach 1:
An analog feedback loop acts as an intermediary between the digital control system and the signal path. The feedback loop continuously monitors the actual power level and makes smooth analog adjustments to compensate for the discrete steps of the digital attenuator, preventing data loss while maintaining precision
Solution Approach 2:
A closed-loop feedback mechanism is implemented where the actual power level is detected and fed back to the control system. This feedback enables real-time correction of attenuation changes, ensuring continuous and accurate power level control without disrupting the signal path
2Measurement precision
If factory calibration is used to set accurate power levels, then power level accuracy is improved, but the radio can provide only a single power level
Solution Approach 1:
The system transitions from static factory calibration to dynamic software-controlled attenuation. The digital attenuator can be programmatically adjusted to provide multiple power levels, while the analog feedback loop dynamically adapts to maintain accuracy across the full range of selectable power levels
Solution Approach 2:
The analog feedback loop serves multiple functions: it maintains power level accuracy across different attenuation settings, enables multiple power levels to be selected, and compensates for variations in the digital attenuator's performance, making the system universally applicable across diverse operating conditions
3Adaptability or versatility
If digital control systems are used to control power levels, then power level selectability is improved, but the system requires complex calibration and consumes significant memory
Solution Approach 1:
The calibration function is extracted from the digital control path and placed in the analog feedback loop. This eliminates the need for complex digital calibration tables and memory storage, as the analog loop automatically adapts to the actual hardware characteristics without requiring pre-stored calibration data
Data Source
AI summary
In a system and method for controlling radio power level, an analog amplifier is utilized with a signal feedback loop. A digitally controlled attenuator is utilized in the feedback loop to apply power level control across a range of power levels.