Active Splitting Amplifier Circuit for Wide RF Dynamic Range
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing amplifier circuits in wireless receivers face challenges in properly amplifying RF signals with significantly different amplitudes, as they often lack the dynamic range to manage such variations effectively.
Innovation Solution
The proposed solution involves an amplifier circuit configuration that includes a common-source amplifier and a common-gate amplifier, where the input of the common-gate amplifier is coupled to the output of the common-source amplifier. This configuration allows for independent gain control of multiple signals and addresses the issue of dynamic range by providing both high gain with low noise figure and low gain with high linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single amplifier circuit is used to amplify RF signals, then the circuit structure is simple, but it cannot effectively handle signals with significantly different amplitudes due to limited dynamic range
Solution Approach 1:
The amplifier circuit is segmented into two independent amplifiers: a first amplifier with high gain for weak signals and a second amplifier with low gain for strong signals. Each amplifier is optimized for specific signal amplitude ranges, enabling the system to handle a wide dynamic range by selecting the appropriate amplifier based on signal strength.
Solution Approach 2:
The system dynamically switches between the first and second amplifiers based on the amplitude of the received RF signal. A controller monitors signal strength and selectively activates the appropriate amplifier, allowing the circuit to adapt its gain characteristics in real-time to match the input signal conditions.
2Reliability
If high gain is used to amplify weak signals, then the noise figure increases, but if low gain is used, then the amplification of weak signals is insufficient
Solution Approach 1:
Each amplifier is designed with specific local characteristics: the first amplifier is optimized for high gain with controlled noise figure for weak signals, while the second amplifier is optimized for low gain with high linearity for strong signals. This localized optimization allows each amplifier to excel in its designated operating range.
Solution Approach 2:
The system changes the gain parameter by selecting different amplifiers based on signal amplitude. For weak signals, the first amplifier provides high gain; for strong signals, the second amplifier provides low gain. This parameter adaptation ensures optimal signal quality without excessive noise figure or linearity degradation.
3Reliability
If high linearity is used to handle strong signals, then the gain is reduced, but if high gain is used, then the linearity deteriorates
Solution Approach 1:
The amplification function is segmented into two specialized amplifiers: one optimized for high gain (first amplifier) and another optimized for high linearity with low gain (second amplifier). This segmentation allows the system to select the appropriate amplifier based on signal strength, ensuring both sufficient gain and acceptable linearity for each operating condition.
Solution Approach 2:
The system dynamically changes the gain and linearity parameters by switching between amplifiers. For strong signals, the second amplifier provides low gain with high linearity to maintain signal fidelity. For weak signals, the first amplifier provides high gain with acceptable linearity to ensure sufficient amplification.
Data Source
AI summary
Aspects of the present disclosure relate to a receiver including an amplifier circuit. The amplifier circuit includes a common-source amplifier having an input and an output, and a common-gate amplifier having an input and an output, wherein the input of the common-gate amplifier is coupled to the output of the common-source amplifier. The receiver also includes a first receive chain coupled to the output of the common-gate amplifier, and a second receive chain coupled to the output of the common-source amplifier.