Carrier Aggregation Amplifier Circuitry for Stable Gain Matching
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Solution Overview
Problem
Designing satisfactory low noise amplifier circuitry for electronic devices with wireless communications capabilities is challenging, particularly when switching between non-carrier-aggregation and carrier-aggregation modes, as it requires maintaining gain and input impedance consistency across modes.
Innovation Solution
The implementation of amplifier circuitry with a common gate amplifier stage, cascode amplifier stage, and common source amplifier stage, along with adjustable capacitors and bias voltage control, allows for operation in both non-carrier-aggregation and carrier-aggregation modes by activating/deactivating cross-coupled capacitors and adjusting input impedance to maintain performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If amplifier circuitry is designed for carrier aggregation mode with multiple component carriers, then the amplifier can handle multiple frequencies simultaneously, but the gain and input impedance consistency becomes difficult to maintain across different operating modes
Solution Approach 1:
The patent implements dynamic switching between different amplifier configurations by enabling or disabling specific amplifier stages (first and second common source amplifier stages) based on the operating mode. This allows the amplifier circuitry to adapt its structure dynamically - operating as a single amplifier in non-carrier aggregation mode and as multiple parallel amplifiers in carrier aggregation mode, thereby maintaining consistent gain and input impedance across modes while achieving carrier aggregation capability
Solution Approach 2:
The amplifier circuitry is segmented into multiple independent amplifier stages (first common source amplifier stage and second common source amplifier stage) that can be selectively activated. Each stage processes a different component carrier in carrier aggregation mode, allowing the system to handle multiple frequencies simultaneously while maintaining proper impedance matching and gain consistency through individual stage optimization
2Adaptability or versatility
If multiple amplifier stages are used to support carrier aggregation, then the amplifier can process multiple component carriers, but the circuit complexity increases
Solution Approach 1:
The patent designs a universal amplifier structure where the first and second common source amplifier stages share common components (input transformer, biasing circuits, and control logic). This multi-functional design allows the same physical hardware to operate in both single-carrier and carrier-aggregation modes by simply enabling or disabling specific stages, thereby reducing overall circuit complexity while maintaining multi-component carrier processing capability
Solution Approach 2:
The patent merges multiple amplifier stages into a single integrated circuit block with shared resources. The first and second common source amplifier stages are combined with common input transformation and biasing networks, allowing them to function as one unified amplifier in non-carrier aggregation mode or as separate parallel amplifiers in carrier aggregation mode, thus reducing device complexity while enabling multi-carrier operation
Data Source
AI summary
An electronic device may include wireless circuitry with a baseband processor, a transceiver circuit, a front-end module, and an antenna. The front-end module may include amplifier circuitry such as a low noise amplifier for amplifying received radio-frequency signals. The amplifier circuitry is operable in a non-carrier-aggregation mode and a carrier aggregation mode. The amplifier circuitry may include an input transformer that is coupled to multiple amplifier stages such as a common gate amplifier stage, a cascode amplifier stage, and a common source amplifier stage. The common gate amplifier stage may include switches for selectively activating a set of cross-coupled capacitors to help maintain input impedance matching in the non-carrier-aggregation mode and the carrier-aggregation mode. The common source amplifier stage may include additional switches for activating and deactivating the common source amplifier stage to help maintain the gain in the non-carrier-aggregation mode and the carrier-aggregation mode.