Amplifier Gain Control Using Switched Amplifying Units
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Solution Overview
Problem
Conventional amplifier systems face challenges in achieving accurate power adjustment due to nonlinear relationships between output power and control parameters, requiring complex and time-consuming calibration processes, and are sensitive to process and temperature variations.
Innovation Solution
An amplifier circuit comprising a gain controller, a first amplifier, and a second amplifier, where the gain controller receives a desired gain value and provides a gain adjust signal to the first amplifier, activating specific amplifying units in the second amplifier to achieve a combined gain matching the desired value, thereby simplifying calibration and compensating for temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a nonlinear relationship between output power and control parameter is used in conventional systems, then power adjustment can be achieved, but the calibration process becomes complex and time-consuming
Solution Approach 1:
The patent changes the functional relationship between control parameters and output power from nonlinear to linear. By using a linear relationship where output power is directly proportional to the control parameter, the system eliminates the need for complex calibration processes while maintaining accurate power adjustment capability
Solution Approach 2:
The patent segments the power adjustment function into two independent parts: a first amplifier providing coarse power adjustment and a second amplifier providing fine power adjustment. This segmentation allows each amplifier to operate in a linear regime, simplifying the overall calibration process while maintaining comprehensive power control range
2Reliability
If conventional amplifier designs are used, then power amplification can be achieved, but the output power characteristic is strongly dependent on process and temperature variations
Solution Approach 1:
The patent implements feedback mechanisms where the actual output power is measured and compared with the desired power level. The system then adjusts the control parameters to compensate for deviations caused by temperature variations and process differences, maintaining stable output power characteristics
Solution Approach 2:
The patent makes the amplifier system dynamic by continuously adjusting operating parameters based on real-time conditions. The system adapts to temperature changes and process variations by dynamically modifying gain settings and power distribution between amplifiers, ensuring consistent performance across varying environmental conditions
Data Source
AI summary
An amplifier circuit includes a gain controller, a first amplifier, and a second amplifier which is coupled in series to the first amplifier, the second amplifier comprising a plurality of amplifying units. The gain controller is configured to receive a desired gain value and provide, based on the received desired gain value, a gain adjust signal to the first amplifier, and activate, based on the received desired gain value, a certain combination of amplifying units of the plurality of amplifying units of the second amplifier, such that a combined gain of the first amplifier and the active amplifying units of the second amplifier corresponds to the received desired gain value.